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Ji, Heng. "Physical modelling of jet grouting process." Thesis, University of Cambridge, 2008. https://www.repository.cam.ac.uk/handle/1810/252114.
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Tank experiment is carried out to investigate the mechanism involved in jet grouting. The observation shows the existence of both seepage and erosion at the intersurface between the injected fluid and the intact soil. The movement of the erosion front, which defines the radius of influence by the jet, can be best described by an exponential function. The influences of various operating parameters are studied, which agree with field observations. The pore water pressure profile measured during the experiment is closely linked with the progress of the erosion front. The pressure increases with the erosion distance, which is associated with the pressure required to drive the spoil back to the surface. A new model is constructed to estimate the ultimate cutting distance by the jet. The proposed model takes the spoil backflow into account in addition to the injected fluid/soil interaction. The jet behaviour is derived from the hydrodynamic characteristics of submerged jet. Based on the jet grouting mechanism, the failure of soil is checked in terms of the horizontal effective stress. The new model gives a more accurate estimation comparing to current models that only consider the soil resistance against the jet action. The new model is developed to cover jet grouting cases using single fluid and double fluid jet grouting systems.
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Ho, Chu Eu. "Turbulent fluid jet excavation in cohesive soil : with particular application to jet grouting." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32416.
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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2005.Includes bibliographical references (p. 267-271).
This thesis reviews the jet grouting methodology, and the current state of practice and research. Current methods of prediction of jet grout diameters are highly empirical and site specific, and do not take into account the jet hydrodynamics and soil properties explicitly. A rational model to describe the jet excavation mechanism for cohesive soil is presented in this thesis, with the aim of providing an improved prediction tool that can be used in jetting design. The model is based on the assumption that the velocity distribution in the cutting jet is equivalent to that of a free jet with boundaries corresponding to the dimensions of the cavity excavated in the ground. The shape of the cavity formed depends on the erosional properties of the soil and jet expansion is limited by the resistance at the jet-soil interface. It is hypothesized that the shape of the cavity excavated follows the locus of the jet radius satisfying the condition of constant wall shear stress. The model predicts that the limit of jet penetration is reached when the dynamic pressure at the jet tip becomes equal to the ultimate soil bearing resistance. The model was validated by laboratory jetting tests, using soil specimens manufactured from powdered kaolin clay, cement and water. Cement-soil ratios (CSR) of 2.5 to 7.5% were used to produce specimens with undrained shear strength (Su) ranging from 5 to 45 kPa. A period of at least 3 days was allowed for the specimen to cure in the test tank before jetting was commenced. The tests were conducted using different nozzle diameters, jetting pressures, rotation speeds and soil strengths. The specimens were exhumed after completion of each test to map the shape of the cuts excavated.
(cont.) The insitu shear strength of the specimens was obtained using torvane and laboratory vane shear tests. Samples were also obtained for density and moisture content measurements. The experimental results showed that the measured and predicted shapes of cut were in reasonable agreement, with the predicted jet width being conservative in most cases. A strong linear correlation was found between jet penetration, nozzle diameter, nozzle pressure difference and soil bearing capacity. It was found that a bearing capacity coefficient (Sc) of 2.4 was applicable for failure at the jet tip. This value of Sc was corroborated by field trial data. Wall shear stresses back-calculated from the experiments were much smaller than the residual soil strengths obtained from laboratory vane shear tests and correspond more closely to the erosional strength of clays. The model enables the lift step of the jetting monitor to be computed directly. The present research demonstrated that valuable information regarding the excavation mechanism can be obtained by careful examination of the actual cut in a soil formed by a jet. It is recommended that further work be done to investigate the erosional process at the jet-soil interface and the properties of the grouted soil, using higher jetting pressures and soils with higher shear strengths. The effect of withdrawal rate on column formation and uniformity of mix is of interest. The brittleness of the grouted product and its effect on strength and deformation behavior is also important.
Chu Eu Ho.
Sc.D.
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Rodrigues, Daniel Filipe Neves. "Jet Grouting - controlo de qualidade em terrenos do miocénio de Lisboa." Master's thesis, FCT - UNL, 2009. http://hdl.handle.net/10362/1951.
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Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Mestre em Engenharia Geológica (Geotecnia)As técnicas de melhoramento de terrenos têm vindo a ser desenvolvidas e aplicadas com maior frequência no âmbito da crescente realização de obras de engenharia em locais de fracas características geotécnicas. A presente dissertação versa sobre uma dessas técnicas, o jet grouting, e aborda os seus aspectos mais relevantes. Neste contexto, efectua-se uma breve referência às aplicações mais frequentes da técnica, dos respectivos sistemas, das variáveis que a influenciam, bem como dos procedimentos executivos e equipamentos utilizados. Referem-se ainda as vantagens, desvantagens e condicionalismos do jet. É dado especial ênfase ao controlo de qualidade no contexto do processo executivo. A dissertação prossegue com a apresentação de um caso de obra, descrevendo-se o acompanhamento dos trabalhos de controlo de qualidade da execução de colunas de jet grouting, em terrenos miocénicos, no Metropolitano de Lisboa, na construção de um trecho, em túnel, do prolongamento da Linha Vermelha, entre a estação do Oriente e o Aeroporto da Portela. Finalmente, sumarizam-se as principais conclusões e sugerem-se alguns trabalhos futuros de investigação nesta temática.
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Adsero, Matthew E. "Effect of jet grouting on the lateral resistance of soil surrounding driven-pile foundations /." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2381.pdf.
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Adsero, Matthew E. "Impact of Jet Grouting on the Lateral Strength of Soil Surrounding Driven Pile Foundations." BYU ScholarsArchive, 2008. https://scholarsarchive.byu.edu/etd/1378.
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Jet grouting was used to strengthen the soft soil surrounding the piles and the pile cap of two full-scale driven pile foundations. Soilcrete columns, created by jet grouting, were placed underneath the pile cap and surrounding the piles of the first foundation. Two rows of soilcrete columns were placed around the perimeter of one-side of the second. All of the jet grouting took place after construction of the pile caps. Laboratory testing of the soilcrete slurry showed the columns as having a design unconfined compressive strength of 550-650 psi, compared with the native soil strength of only 6-8 psi (850-1150 psf). Lateral loading of the pile foundation was then performed on these foundations. The results of this test were compared with a similar test performed on the same foundations under native soil conditions. The total lateral capacity of the pile foundation treated underneath the pile cap was increased by 500 kips, which equals an increase of 175%. The total lateral capacity of the pile foundation treated adjacent to the pile cap was 150%. Results of testing suggest that each of the jet-grout treated zones displaced as a rigid block. A majority of the increased lateral resistance came from the passive soil resistance acting on the face of the blocks and the adhesive soil resistance acting on the sides and bottom of the block as it displaced through the native soil. The remaining soil resistance, not accounted for by the passive and adhesive soil resistance, can potentially be attributed to increased soil pile interaction, which is predicted from the decrease in pile head rotation during loading following soil treatment.
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Černiavska, Irena. "Pagrindų injekcijos metodų naudojimo pastatų rekonstrukcijai tyrimai." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080626_161237-65581.
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Baigiamajame magistro darbe apžvelgiami pamatų ir pagrindų stiprinimo būdai. Laboratorijoje atliktas sustiprinto natrio silikato tirpalu grunto tyrimas, nustatyta jo mechaninių savybių priklausomybė nuo bandinių kietėjimo laiko. Nagrinėjamas pagrindų injekcijos metodų naudojimas pastatų rekonstrukcijai. Taikant COSMOS programinį paketą įražos apskaičiuotos šiais atvėjais: 1. Sudarius erdvinį grunto masyvo modelį, kai gruntas po pastato pamatu nesustiprintas; 2. Kai gruntas sustiprintas porų injekcijos (angl. Grouting) metodu; 3. Kai gruntas sustiprintas srautinės injekcijos (angl. Jet-grouting) metodu. Palyginamas įtempių sklidimas ir poslinkių kaita grunte (smėlis). Gautų atsakymų analizavimas.Foundations and grounds strengthening methods were reviewed in this Master thesis work. The test of soil strengthened with sodium silicate solution was accmlished in the laboratory. Dependence of soil mechanical characteristics from samples solidification time was ascertained. Usage of grounds injection menthods for reconstruction of buildings was investigated. Applying COSMOS program package the efforts were estimated in such cases: 1. forming the dimensional model of soil solid when the soil under the foundations of the building is not strengthened; 2. when the soil is sthrengthened using the Grounting method; 3. when the soil is strengthened using the Jet-grounting method. Spread of strains and vicissitude of shifts in the soil (sand) were compared. The analysis of obtained results was made.
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Carletto, Marcos Francisco Wosgrau. "Jet Grouting (sistema monofluido): um método teórico simplificado para a previsão do diâmetro das colunas." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3145/tde-13102009-154059/.
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O jet grouting é uma das técnicas de tratamento de solos mais utilizadas em todo o mundo. Consiste em jatear uma calda de cimento a altíssima velocidade no subsolo, com ou sem a adição de água e/ou ar comprimido. Os fluidos são injetados através de minúsculos bicos posicionados na extremidade de uma composição especial de hastes, que giram à velocidade constante enquanto sobem lentamente em direção à superfície do terreno. O jato remove e mistura o solo, produzindo um corpo consolidado de formato aproximadamente cilíndrico (a coluna de jet grouting). Variando os parâmetros operacionais (pressão de bombeamento, quantidade e diâmetro dos bicos, velocidade de extração das hastes, relação água/cimento da calda) e em função do tipo de solo, podem ser obtidas colunas de diâmetros variáveis dentro de um amplo intervalo. Na busca do diâmetro desejado, a escolha dos parâmetros de tratamento é feita atualmente com base em regras empíricas nem sempre pertinentes, causando muitas vezes o fracasso do tratamento ou, ainda, tornando-o excessivamente oneroso. Esta tese de doutorado apresenta um método simplificado para a previsão do diâmetro das colunas de jet grouting (sistema monofluido). Conjugando a análise racional do fenômeno físico de interação jatosolo (Modoni et al., 2006) à facilidade de aplicação característica dos métodos empíricos, propõe-se uma ferramenta ágil para a escolha da combinação mais adequada dos parâmetros de tratamento.Jet grouting is one of the most popular ground improvement techniques all over the world. The method is based on high-speed grouting of water-cement mixtures and/or other fluids (air, water) into the subsoil. The fluids are injected through small diameter nozzles placed on a grout pipe, which is continuously rotated at a constant rate and slowly raised towards the ground surface. The jet removes and mixes the soil, producing a cemented body of quasi-cylindrical shape (the jet grouting column). Varying the operational parameters (grout pressure, number and diameter of the nozzles, monitor lifting rate, water-cement ratio of the grout) and as a function of the soil type, columns of variable diameters can be obtained in a wide interval. Currently, in search of the required diameter, the choice of the operational parameters is done on the basis of empirical rules not always relevant, causing very often the failure of the treatment or making it excessively onerous. This thesis presents a simplificated method for the prediction of the column diameter (single fluid system). Conjugating the rational analysis of the physical phenomenon of jetsoil interaction (Modoni et al., 2006) to the typical easiness of empirical methods application, an agile tool is proposed for the choice of the most appropriate combination of the operational parameters.
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Brinck, Mårten, and Karl Stigenius. "Jet grouting as a method for sealing sheet pile excavations in Swedish conditions : A probabilistic approach." Thesis, KTH, Jord- och bergmekanik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-259693.
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Jet grouting is a groundimprovement method that creates cemented columns in the soil. The soil isinjected with different pressurized fluids, through the monitor, to replace andcement the soil, often with water cement grout. There are three different commonsystems for ejecting the fluids, the single, double and triple fluid system.The process is performed from the ground surface by drilling to desired depthand then withdrawing the monitor while rotating and ejecting and thus creatinga column. There are many applications for this technique. However, this thesisfocus on using jet grouted columns in formation to seal sheet pile excavationsfrom water.
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Coelho, Pedro. "Projecto e Observação de obras geotécnicas: Soluções de estabilização de taludes acomodando infraestruturas em exploração." Master's thesis, Academia Militar ; Instituto Superior Técnico, 2010. http://hdl.handle.net/10400.26/9775.
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Existem inúmeros tiposde estruturas de contenção e estabilização aplicadas em taludes rodoviários.
Com a presente dissertação, pretende-se descrever os principaiscritérios e procedimentos inerentes à concepção e, consequente execução, de um projecto de contenção e estabilização distinto dos geralmente utilizados em território nacional, numa situação de escorregamento consumado. A complexidade de adopção de uma estrutura de contenção e estabilização face ao acontecimento mencionado e envolvida na necessidade de garantir a circulação rodoviária nas vias de circulação não atingidas pelo escorregamento, determinou a utilização de variadas soluções construtivas, empregando tecnologia moderna no domínioda geotecnia.
O projecto em análise contempla essencialmente a execução de trabalhos de estabilização/tratamento do solo, de escavação, de aterro, de fundações profundas, de drenagem e de uma estrutura de contenção. As soluções utilizadas para a realização dos trabalhos referidos são diversificadas, incluindo tecnologia de jet grouting, microestacas, contenção recorrendo a big bags e execução de pavimento.
Para além da descrição da campanha realizada, apresentam-se fundamentos teóricos necessários à compreensão das técnicas abordadas e realiza-se uma apreciação de carácter qualitativo às várias soluções adoptadas.
Um projecto deste tipo deve garantir a máxima segurança nos mais variados parâmetros.
Neste sentido, para além das medidas padrão utilizadas e da procura de soluções com um contributo indispensável para a segurança, foi adoptado um plano de instrumentação e observação, com recurso a vários instrumentos de monitorização.
O dimensionamento de uma estrutura de contenção requer conhecimentos na área da mecânica dos solos. Deste modo, pretende-se elucidar o leitor acerca das teorias clássicas utilizadas no cálculo de impulsos, de modelos de colapso de maciços e da legislação utilizada num projecto geotécnico desta natureza.Abstract There are several types of retaining and stabilization structures applied to road embankments. The objective of this study is to describe the main criteria and procedures inherent to the design and subsequent execution of a retaining and stabilization project, different from those that are generally adopted at a domestically level, on the case of a confirmed slipping embankment. The complexity associated with the employment of a retaining and stabilization structure in response to the aforementioned circumstance, in addition to the imperative assurance of safety conditions along the road travel routes that remain unaffected, determined the use of various constructive solutions and application of modern technology, predominantly within the field of geotechnical engineering. The project under review primarily considers processes of soil stabilization/treatment, excavation, backfilling, deep drainage and a retaining structure. The solutions adopted for the completion of these tasks are diverse, including jet grouting technology, micropiles, containment using big bags and the execution of pavement. As well as the description of the completed case study, theoretical foundations are explored in order to understand the discussed techniques. In addition tothis, a qualitative assessment is employed for the evaluation of the various adopted solutions. A project of this type should ensure maximum safety according to the most various criteria. For this reason instrumentation and observation plan, relying on the use of various monitoring instruments is employed over and above the use of standard procedures and search for solutions that make the necessary contributions to safety conditions. The design of a retaining structure requires expertise in the field of soil mechanics. Therefore, the intention is to provide the reader with a clear insight into the classical theories used in the calculation of impulses, massif collapse models and the legislation used in geotechnical designs of this nature.
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Skog, Axel. "Strukturella förbättringar av en markstabiliseringsmast." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-53553.
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This report has examined the possibilities of stiffening and strengthening a ground stabilization mast, in a way that a small production company can manufacture. The soil stabilization technique in question is Jet-Grouting also called injection drilling, which involves drilling to the desired depth and then letting high-pressure water jets mixed with filling mass to erode the surrounding soil mass and form pillars below the ground surface. The study intends to explore the possibility of placing a simplified model in the simulation program ANSYS that uses the finite element method (FEM) to obtain its results. The product development method described by Karl T. Ulrich and Steven D. Eppinger in the book "Product Design and Development" is then used to produce improvement proposals that will strengthen the mast. The purpose of this study was to identify the strength of a ground stabilization mast and then produce and present an improvement proposal, based on the rotation head that is now mounted on the ground stabilization mast. This rotary head is named "RH24X HP 67 TS" and is produced by Eurodrill, and it generates a maximum torque of 24 kNm. The simulations on the mast with the given torque resulted in the highest stress of 158 MPa to which the mast body was exposed to. With the design that the mast current design, it entails a 2.3 factor of safety, which is considered acceptable since the recommended factor of safety for this type of heavy machine is about 2 (Khan, et al., 2016). When the torque was increased to the limit of the mast, i.e., when the factor of safety is close to 1, it resulted in a maximum torque of 54 kNm. Mounting a rotary head with a torque of 54 kNm is therefore not recommended due to the low safety margin that it would entail. Market research has been done and the proposals presented in this study presents similar manufactures and series as of the current rotary head. The recommended rotary heads come from the Eurodrill X-series and are called "RH32X HP 67 TS" and it produces a maximum torque of 32 kNm, alternatively "RH 4300 HP 48 TSS" which produces a torque of 34 kNm. The improvement proposals presented in this report are developed by evaluating the results of the simulations performed and then identifying the weakest areas. Then, based on the product development method, generate a proposal that can stiffen and strengthen the ground stabilization mast. The improvement proposal on the cradle showed with the rotary head "RH24X HP 67 TS" a 4.8 factor of safety, compared to the current cradle which has a 2.6 factor of safety, it is almost a doubling in strength. A new design of trusses was presented and resulted in a 35% increase in rigidity without the need to add any new material. This means that by re-examining the structure of the truss you can strengthen and possibly check the rigidity of the mast, which among other things leads to better manoeuvrability without any real extra costs being needed.Denna rapport har undersökt möjligheterna att styva och styrka upp en markstabiliseringsmast på ett sätt som ett mindre produktionsföretag klarar av att tillverka. Markstabiliseringstekniken i fråga är Jet-Grouting även kallad injiceringsborrning, som går ut på att man borrar till önskat djup för att sedan låta högtrycksvattenjetstrålar blandat med fyllnadsmassa erodera den kringliggande jordmassan och bilda pelare under markytan. Studien ämnar utforska möjligheten med att placera en förenklad modell i simuleringsprogrammet ANSYS som använder finit elementmetod (FEM) för att få fram sina resultat. Därefter används produktutvecklingsmetoden som beskrivs av Karl T. Ulrich och Steven D. Eppinger i boken ”Product Design and Development”, för att ta fram förbättringsförslag som ska styrka upp masten. Studien har haft som syfte att ta reda på hållfastheten hos en markstabiliseringsmast och sedan ta fram och presentera ett förbättringsförslag, utifrån det rotationshuvud som nu är monterat på markstabiliseringsmasten. Detta rotationshuvud har benämningen ”RH24X HP 67 TS” och är producerad av Eurodrill och genererar ett maximalt vridmoment på 24 kNm. Simuleringarna på masten med det givna vridmomentet resulterade i den högsta spänningen på 158 MPa som mastkroppen utsattes för. Med det utförande som masten är idag medför det en 2,3 säkerhetsfaktor, vilket är anses vara acceptabelt eftersom den rekommenderade säkerhetsfaktorn för denna typ av tungmaskin ligger på cirka 2 (Khan, et al., 2016). När man sedan ökade vridmomentet till mastens bristgräns, det vill säga när säkerhetsfaktorn tangerar 1, resulterade det i ett maximalt vridmoment på 54 kNm. Att montera ett rotationshuvud med ett vridmoment på 54 kNm är därför inte att rekommendera på grund av den låga säkerhetsmarginalen som det skulle innebära. Därför presenteras förslag på rotationshuvuden som masten kan klara av, genom en marknadsundersökning gjord på liknade tillverkare och serier som dagens rotationshuvud. De rotationshuvud som rekommenderas kommer från Eurodrill X-serie och heter ”RH32X HP 67 TS” och den producerar ett maximalt vridmoment på 32 kNm, alternativt ”RH 4300 HP 48 TSS” som producerar ett vridmoment på 34 kNm. Förbättringsförslagen som presenteras i denna rapport är framtagna genom att utvärdera resultaten av de utförda simuleringarna och sedan identifiera de svagaste områdena. Därefter genereras förslag utifrån produktutvecklingsmetoden som kan styva och stärka upp markstabiliseringsmasten. Förbättringsförslaget på släden visade med rotationshuvudet ”RH24X HP 67 TS” en 4,8 säkerhetsfaktor, jämfört med den nuvarande släden som har en 2,6 säkerhetsfaktor vilket är nästan en fördubbling i hållfasthet. En ny design av fackverk presenterades och resulterade i 35 % ökad styvhet utan att behöva addera något nytt material. Det innebär att man genom att ompröva fackverkets struktur kan stärka och eventuellt kontrollera mastens styvhet, vilket bland annat leder till bättre manövrerbarhet utan några egentliga extra kostnader behövs.
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Minarčík, Jan. "Založení výrobního zařízení v hale." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409750.
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The main topic of diploma thesis is foundation of Heavy equipment in industrial facility and the selecting of the appropriate method foundation with respect to the boundary condition. The first part contains the theoretical basis of the chosen special foundation technology. In the second part, there is the design of the foundation itself. To solve the design was used special numerical softwares and also there was some calculation without using it. The necessary design documentation was also created.
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Vacek, Pavel. "Bytový dům "Vacek"." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227463.
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I have designed the construction of a apartment building with multifunctional usage. A significant element is the internal automatic parking system, which is a relief for the residents of the house on a street crowded with parked cars. On the ground floor is a lucrative cafe with sitting area and two bowling lines. The house contains 18 housing units for 4-6 people. People are attracted by prestigious location with views of the city Brno on the dominant historical monuments and are attracted by a pleasant interior of the apartments, too. They are logically divided into 4 zones - day, night, working and relaxing. For relaxation, they may use the spacious balconies, terraces and a common area in the garden with children's play area. One part of this work is a focus on securing of construction pit and foundation of a building, which is almost a technical delicacy.
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Tarbajová, Mária. "Napjatostní analýza šachet zhotovených z tryskové injektáže." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372004.
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The subject of the diploma thesis is the stress analysis of the circular and elliptical shaft from material jet grouting. A new advanced constitutive Shotcrete model will be applied on the material jet grouting. In the thesis, the shaft tensile strength factor and the size of the ground pressures will be primarily examined. The practical part of the diploma thesis is completed by the comparison of the analytical and numerical calculation of the normal force of the circular and elliptical shafts.
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Korec, Michael. "Založení nové a sanované podpěry "Starého mostu" přes Dunaj v Bratislavě." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227604.
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The thesis is focused on the reconnstruction of the "Old Bridge“ in Bratislava. Part of the reconstruction is the foundations of a new pier and redevelopment of an existing pier. The introduction provides an overview of methods used for the foundations within the river and from there onwards, the most suitable method haas been selected. The piers foundation is designed in several variants, coupled with the drawings. In conclusion, the variants were compared and the most suitable one was selected.
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Šorm, Petr. "Hrubá stavba objektu AV v Praze Dejvicích - stavebně technologický projekt." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-227006.
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Building Technology project deals with the processing of the necessary documents and documentation for implementation shell of the building of the Academy of Sciences in Prague Dejvice. At the beginning of the technical report on the building technology project, which provides basic information about the construction. Content is the solution of the building construction site by the financial, structural and technological and time. Construction technology solution is based on monolithic work.
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Čechová, Simona. "Vyhodnocení zatěžovacích zkoušek pilot z tryskové injektáže." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2021. http://www.nusl.cz/ntk/nusl-433418.
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The master thesis consists of a theoretical part and a practical part. In the theoretical part jet-grouting technology is described briefly. Mechanical properties of jet-grouted piles were characterized. Various estimation methods of ultimate pile bearing capacity are described in this thesis – analytical calculation of ultimate bearing capacity for bored piles and estimation of ultimate pile bearing capacity by analysis of load-displacement curve defined by CHIN (1970; 1972). Load transfer method for piles and hyperbolic load-transfer curve are introduced. As a part of the load-trasfer method analysis, a method of estimating ultimate pile shaft friction called beta method is defined. In the practical part were evaluated several static load tests of jet-grouted piles and were constructed their load-displacemnt curves. Then reverse analysis of the results from static load tests was performed using load-transfer method. Then ultimate pile bearing capacity was estimated using analytical calculation of pile bearing capacity for bored piles and using analysis of load-displacement curve with method by CHIN (1970; 1972). By evaluation of load transfer method and beta method ultimate shaft resistence for each pile was estimated. Results and load-displacement curves were compared.
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Surý, Václav. "Stavebně-technologický projekt pavilonu horského hotelu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226498.
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This master´s thesis solves the constructive - technological project of pavilion of mountain hotel. It is an extension of pool hall. The master´s thesis includes: nail shoring walls, jet grouting, excavation, reinforced concrete base pan. There are technological solutions, especially prescription nail walls and jet grouting. Solution also contains the site facilities, the schedule, the situation with the solution structure of transport routes, itemized budget, proposed mechanical assembly, safety and health at work.
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Podškubka, Martin. "Stavebně technologický projekt rezidenčního domu v Brně." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372035.
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The subject of this Diploma thesis is building and technological project of a residential house in Brno, which contain the implementation of the underground car park and residential building, which has three above-ground floors. Attention is focused mainly on the technological processes of bottom building. Text section contains the technical report on the structural and technological project, study implementation of major technological stages of building, technical report of construction site equipment, technological regulations, inspection and test plan, study of noise, plan health and safety at work, the design of the main building machines and mechanisms including transport routes. The attachment section contain time and financial plan construction-object, time deployment of machines, plan of material resources, time schedule, technology standard, budget, drawings of construction site equipment, verification of tower crane construction and schema of processes concreting.
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Губашова, Валентина Євгенівна. "Обґрунтування раціональних технологічних параметрів струменевої цементації в складних геотехнічних умовах." Doctoral thesis, Київ, 2021. https://ela.kpi.ua/handle/123456789/40256.
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Дисертація присвячена обґрунтуванню раціональних технологічних параметрів струменевої цементації в складних геотехнічних умовах. В роботі досліджено та встановлено взаємозв’язки технологічних параметрів струменевої цементації з діаметром ґрунтоцементної колони в різних типах ґрунтів. На основі отриманих експоненціальних залежностей діаметра ґрунтоцементного елементу круглого перерізу від енергії високонапірного струменя цементного розчину розроблено методику розрахунку діаметра струменево-цементаційної колони. В процесі дослідження експериментальним шляхом доведено змінення фізико-механічних властивостей ґрунту, що оточує ґрунтоцементний елемент під час його виконання за струменевою технологією. На підставі математичного моделювання визначено закономірності формування в ґрунтових масивах зон з поліпшеними фізико-механічними параметрами в міжколонному просторі в різних типах ґрунтів. Удосконалено методику комп’ютерного моделювання управління напружено-деформованим станом основи будівлі під час її підсилення струменево-цементаційними елементами з урахуванням складних геотехнічних умов.
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Kuo, Lin-Yao, and 郭林堯. "Properties of Soilcrete Stabilized with Jet Grouting." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/77351961569170483257.
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碩士國立交通大學
土木工程系
89
In this thesis, the mechanical properties of jet-grouted soilcrete are investigated. In the first part of this paper, samples cored from Taipei sewerage construction were used to conduct the following experiments : ultrasonic test, uniaxial compression test, triaxial compression test, and Brazilian test. Base on the experimental results, the following conclusions are made : 1. The mechanical behavior of soilcrete is significantly affected by its dry density. The uniaxial compressive strength, modulus of elasticity, failure strain, tensile strength, compressive wave velocity, and shear wave velocity of soilcrete increased with increasing dry density. 2. The uniaxial compressive strength of soilcrete varied from 3.02 to 8.72 MPa. The modulus of elasticity of soilcrete varied from 1.11 to 4.77 GPa. The Poisson’s ratio of soilcrete varied from 0.05 to 0.29, which were close to the values for concrete ( 0.1 to 0.2 ). 3. Based on Brazilian tests, the tensile strength of soilcrete varied from 0.21 to 0.87 MPa, which were close to the values reported in many different articles published data ( σt,B = 0.20 ~ 0.95 MPa ). 4. Test data from triaxial compression tests indicated that the cohesion of the soilcrete is 0.73 MPa, and the internal friction angle is 38.70. In the second part of this paper, cases reporting of the mechanical properties of jet -grouted soilcrete were been collected. Base on the field data, the following conclusions are made: 1. The uniaxial compressive strength of soilcrete was significantly affected by the type of native soil. For soilcreted formed peat, the upper limit of qu was only 3 MPa. For soilcrete formed in clay, the range of qu varied from 0.4 to 12.0 MPa. For soilcrete formed in sand, qu = 0.4 ~ 26.0 MPa. 2. The uniaxial compressive strength of soilcrete can not be properly estimated only with the c/w ratio of the grout. 3. Most of the uniaxial compressive strengths of soilcrete reported in the literature were higher than that suggested by the JSG Association. It is clear that the qu values suggested by JSG Association are the minimum strengths required for quality control of construction. 4. The modulus of elasticity of soilcrete increases with increasing uniaxial compressive strength. The qu of soilcrete formed in gravel is higher than that formed in clay.
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He, Guan-Jie, and 何冠杰. "Jet Grouting Diameter Measurement Using Electrical Resistivity Tomography." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/93644370416597446949.
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碩士國立交通大學
土木工程系所
104
Jet grouting method is currently among the common ground improvement technique, which performance is closely related to the integrity of improved columns (diameter and continuity). Therefore, column integrity assessment is necessary for quality control. Electrical Resistivity Tomography (ERT) imaging method is capable of detecting or monitoring spatial distribution of resistivity in 2D or 3D stratum. Considering detection accuracy, economy, workability and other aspects, in-hole ERT which has high application potential, was selected as integrity assessment of the improved column in terms of qualitative and quantitative evaluation. In this research, a 3D numerical model was constructed to simulate ERT measurement profile for improved columns. Axial-symmetrical 2D resistivity imaging profile of the improved columns under different circumstances was analyzed. In order to accurately identify the variation of column diameter, diameter quantification method was proposed and its accuracy and restriction was appraised. Results showed that in case the improved column is highly asymmetrical, only qualitative analysis is reliable and effective column diameter cannot be measured precisely. For those axial symmetrical columns, column integrity can be examined accurately and is shown feasible. However, for hollow improved columns, the resistivity variation of the material under test around the electrodes is too large, leading to quantification misjudgment as the effective resistivity is not of geometrical average, yet ERT can still realize this averaged resistivity phenomenon. To verify the feasibility of this approach and the result of numerical simulations, both laboratory sandbox experiment and field test were conducted. Both experimental result verified that column integrity assessment using in-hole ERT is feasible for columns that are near axial symmetrical. The position and appearance of the improved columns were clearly detected by this approach and the column diameters were also accurately quantified. Currently, there is lack of commercial electrode cable designated for in-situ borehole ERT. Therefore, this study aimed at developing a modularized portable electrode cable for in-situ borehole ERT, which would meet the requirements of durability, functionality, convenience, versatility and others. The feasibility of this cable design concept is tested feasible through a series of experiment in this study.
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Vasconcelos, Filho José Neurinei de. "Estudo da requalificação das fundações do edifício solar de Santana, Lisboa." Master's thesis, 2019. http://hdl.handle.net/10316/93506.
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Dissertação de Mestrado em Reabilitação de Edifícios apresentada à Faculdade de Ciências e TecnologiaThe increasing demand and small availability of habitable spaces in big cities, mainly due to the high population demographics, together with the need to restore and dynamize the historic centres of the cities has boosted Urban Rehabilitation in recent years. In this context, this thesis presents the study of the refurbishment of the foundations of the “Edifício Solar de Santana”, located in Lisbon. Initially, a literature review of the topic is carried out, with the presentation of the general concepts, and of topic is carried out with the presentation of the general concepts, and of the main techniques typically used in the refurbishment of foundations. Subsequently, the case study presented, with, focus on the micropiles solution adopted in the project and on the instrumentation results which allowed monitoring the several construction stages of the refurbishment of the foundations. Finally, the possibility of adopting an academic solution which incorporates jet grouting columns instead of micropiles is assessed through a financial feasibility study.This thesis has the purpose of presenting the main advantages and drawbacks of the micropiles and jet grouting techniques, highlighting its principal characteristics and suitability to different types of conditions. The financial feasibility study showed that depending of the soil conditions and of the existing local constrains the jet grouting technique can be a feasible solution. However, for the case study presented the use of micropiles appears to be the best solution since the foundation soil exhibits high bearing capacity.
A maior procura de espaços habitáveis nas grandes cidades e a baixa disponibilização dos mesmos, principalmente devido às elevadas demografias populacionais, juntamente com a necessidade de restaurar e dinamizar os centros históricos, impulsionou nos últimos anos a Reabilitação Urbana. Nesse contexto, a presente dissertação é um estudo de um destes casos, em concreto, sobre a requalificação das fundações do Edifício Solar de Santana, localizado em Lisboa. Inicialmente, é realizada uma revisão bibliográfica acerca do tema em questão, apresentando-se a definição geral de alguns conceitos, focando principalmente nas técnicas de reabilitação mais utilizadas. Em seguida é apresentado o caso de estudo que serviu de base para esta dissertação, procurando detalhar como a estrutura foi projetada, a solução de microestacas utilizada em projeto e o acompanhamento das diversas etapas da requalificação das fundações através da interpretação dos diversos dados provenientes da monitorização. Por fim, através de um estudo de viabilidade financeira, é avaliada academicamente a possibilidade de utilização de colunas de jet grouting como solução alternativa à utilização das microestacas.Com esta dissertação pretende-se elencar as vantagens e desvantagens das técnicas de execução de microestacas e jet grouting, detalhando as suas principais características e qual o seu tipo de uso mais adequado. A análise financeira efetuada permite demonstrar que dependendo das condicções de solo e das condicionantes locais existentes o jet grouting pode se tornar uma solução viável. Porém, deve-se ressaltar que para o caso tratado nesta dissertação o uso de microestacas pode considerar-se a melhor opção dado que o solo existente possuía uma boa capacidade resistente.
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Pereira, Manuel Ricardo Martins de Carvalho Lima. "Escavações em maciços terrosos suportados por paredes de Jet Grouting." Dissertação, 2009. http://hdl.handle.net/10216/57540.
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Guerra, Gonçalo Miguel Torrão. "Contenção com paredes autoportantes de Jet Grouting em escavações cilíndricas." Dissertação, 2009. http://hdl.handle.net/10216/60465.
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Pereira, Carlos Duarte Dias. "Aplicação de Jet-Grouting em escavações profundas em solos moles." Dissertação, 2008. http://hdl.handle.net/10216/60112.
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Tinoco, Joaquim Agostinho Barbosa. "Application of data mining techniques to jet grouting columns design." Doctoral thesis, 2012. http://hdl.handle.net/1822/23081.
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Tese de doutoramento em Civil Engineering (ramo de conhecimento em Geotechnics)Jet Grouting (JG) is actually a reference method on soil improvement technologies, allowing to improve the strength, stiffness and permeability of soft soils. However, even after several years of practice and notable technology advances, there are still some limitations to overcome. In particular, the main limitation is the absence of efficient approaches for its design. Indeed, the actual design approaches are essentially based on empirically and less accurate methods that are often too conservatives. As a results, the economy and the quality of the treatment can be affected. Therefore, it is fundamental to develop new approaches able to accurately predict JG columns mechanical properties as well as its diameter. However, due to the high number of variables involved in JG process and the heterogeneity of the soils treated, the accomplishment of such complex task represents a major challenge. This challenge relies in the fact that a JG model design should be able to incorporate simultaneously the effect of different variables (e.g. soil and cement slurry properties). So far, the traditional statistical approaches were unable to deal with the complexity of JG data. However, in the past few years powerful tools have emerged for extracting useful information from large and complex data. These tools are currently known as Data Mining (DM) techniques and have been successfully applied in different application domains.. In the present research work, some of the most well known DM algorithms were applied in the prediction of the mechanical properties of JG mixtures as well as JG columns diameter. Therefore, and as a first step, a multiple regression, artificial neural network, support vector machine and functional network algorithms were trained to predict JG laboratory formulations stiffness and uniaxial compressive strength. Moreover, the analytical expressions proposed by Eurocode 2 and CEB-FIP Model Code 1990 for strength and stiffness prediction of concrete were adapted to JG mixtures. After that, the same methodologies were applied in the prediction of strength, stiffness and column diameter of real JG columns. As the main outcomes of this work, high quality predictive models were achieved, as well as a better understanding of the JG mixtures behaviour (given by a global sensitivity analysis). Such results are quite useful for JG design, being expecting an economic and technical improvement through a better optimization of the available resources and efficient design
Jet Grouting (JG) surge atualmente como um método de referência entre as tecnologias de melhoramento de solos, permitindo o aumento da resistência e deformabilidade bem como a diminuição da permeabilidade de solos moles. No entanto, mesmo após vários anos de prática e de notáveis avanços tecnológicos, existem ainda algumas limitações a vencer. Uma das mais relevantes prende-se com a ausência de abordagens eficientes de dimensionamento. De facto, as atuais abordagens de cálculo são essencialmente suportadas por métodos empíricos e pouco precisos, por vezes até demasiado conservativos. Em consequência, a eficiência técnica e económica do tratamento pode ficar comprometida. Neste sentido, é fundamental desenvolver novas abordagens capazes de prever com maior precisão as propriedades mecânicas e respectivo diâmetro das colunas de JG. Contudo, devido ao elevado número de variáveis envolvidas e à heterogeneidade dos solos tratados, tal tarefa representa um enorme desafio. Este desafio prende-se com o facto de um modelo de dimensionamento da tecnologia de JG dever ser capaz de incorporar simultaneamente o efeito de diferente variáveis (e.g. propriedades do solo e da calda injetada e o tipo de jet). Até aos dias de hoje, as ferramentas estatísticas tradicionais foram incapazes de lidar com a complexidade caracteristica de dados JG. No entanto, nos últimos anos têm emergido ferramentas com enorme potencial, capazes de analisar e extrair informação útil de grandes volumes de dados complexos. Estas ferramentas são correntemente conhecidas como técnicas de Data Mining (DM) e têm sido aplicadas com sucesso em diferentes áreas do conhecimento. No presente trabalho de investigação, alguns dos mais conhecidos algoritmos de DM foram aplicados na previsão das propriedades mecânicas de misturas de JG bem como na previsão do diâmetro das respetivas colunas. Assim, numa primeira fase, os algoritmos de regressão múltipla, redes neuronais artificiais, máquina de vetores de suporte e redes funcionais foram treinados para prever a deformabilidade e a resistência à compressão uniaxial de formulações laboratoriais de JG. Além disso, as expressões analíticas propostas pelo Eurocódigo 2 e pelo CEB-FIP Model Code 1990 usadas na previsão da resistência e deformabilidade do betão, foram também adaptadas a misturas de JG. Posteriormente, as mesmas metodologias foram aplicadas na previsão da resistência, deformabilidade e diâmetro de colunas reais de JG. Como principais resultados do presente trabalho, destaca-se a elevada qualidade previsional dos modelos obtidos, bem como uma melhor compreensão do comportamento de misturas de JG (conseguida através da aplicação de análises de sensibilidade globais). Estes resultados são um claro contributo para o dimensionamento de colunas de JG, antevendo-se uma maior eficiência técnica e económica, através de uma melhor otimização dos recursos disponíveis e eficiência no dimensionamento.
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LO, WEN-KUNG, and 羅文恭. "Three-Dimensional Analysis of Jet Grouting Piles and Deep Excavation." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/459nb8.
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碩士國立臺北科技大學
土木工程系土木與防災碩士班
107
This study was intended to investigate the use of jet grouting piles below the foundation surface of deep excavation to increase the shear strength of soil on the excavation side and, thus, reduce the lateral displacement in the raining walls. To determine the influence of jet grouting piles on retaining walls in deep excavation, the FE program, PLAXIS 3D was used for numeric analysis and the building project of excavation on Zhongshan North Road, Taipei City selected for simulation. The excavation was performed using the bottom-up procedure were the construction steps were configured accordingly. For the numeric analysis model, plate element was used to simulate diaphragm walls, composite soil, solid pile element and embedded beam for soil improvement piles, and anchor element for the I-beam members of the strutting system. Prestressing was added at each construction step to create the excavating strutting system for the deep excavation. Area load was added to the analysis to simulate the surface load acting on surrounding roads, whereas neighboring buildings were converted into an elastic volume material with equivalent load. The Mohr-Coulomb model was introduced to this study. The “soil improvement piles” below the excavation surface were grouped into 3 models, namely Model (I) for composite soil simulation, Model (II) for solid pile elements for soil strengthening and Model (III) for embedded beam simulation, for analysis and comparison to in-situ monitoring data. The comparison between the curve plotted from the Plaxis 3D analysis and that from monitoring data indicated that the displacement of diaphragm walls was underestimated regardless the Mohr-Coulomb undrained (A) model or undrained (C) model. However, when it comes to the analysis with the three soil improvement simulation models, the curves from the simulation with solid piles or that with embedded beam were closer to the in-situ monitoring curves than those from the simulation with composite soil in terms of diaphragm wall displacement.
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Rodrigues, Andrea Raquel David. "Técnicas de injeção. Jet grouting, aplicações e regras de dimensionamento." Master's thesis, 2018. http://hdl.handle.net/10400.8/3854.
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As técnicas de injeção são frequentemente utilizadas no melhoramento das características físicas e mecânicas dos solos, que apresentam resistência insuficiente, grande deformabilidade ou permeabilidade excessiva. A presente dissertação tem como objetivo abordar uma das técnicas de injeção mais utilizada, o jet grouting, caracterizada pela sua grande versatilidade e flexibilidade de aplicação nas mais diversas obras geotécnicas.
Embora muito utilizada e com rápido crescimento, é notável um certo grau de incerteza na fase de projeto, quanto ao resultado do tratamento, na previsão da geometria das colunas (diâmetro) e das suas propriedades mecânicas. Atualmente o dimensionamento é baseado em regras empíricas, na experiência dos projetistas e em ensaios in situ.
A norma europeia EN 12716 (2001) define as especificações para a execução e controlo de qualidade da técnica de jet grouting, abordando o dimensionamento apenas a título informativo, não dispondo de prescrições para a verificação da segurança.
Tendo em conta o grande potencial da técnica, o presente estudo pretende entender o processo de jet grouting, as suas principais aplicações e sintetizar a metodologia de dimensionamento e as respetivas verificações de segurança de acordo com as publicações de trabalhos de referência e a normalização em vigor.
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Pereira, Manuel Ricardo Martins de Carvalho Lima. "Escavações em maciços terrosos suportados por paredes de Jet Grouting." Master's thesis, 2009. http://hdl.handle.net/10216/57540.
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Guerra, Gonçalo Miguel Torrão. "Contenção com paredes autoportantes de Jet Grouting em escavações cilíndricas." Master's thesis, 2009. http://hdl.handle.net/10216/60465.
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Pereira, Carlos Duarte Dias. "Aplicação de Jet-Grouting em escavações profundas em solos moles." Master's thesis, 2008. http://hdl.handle.net/10216/60112.
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Bzówka, Joanna. "Obliczeniowy model pala wykonanego techniką wysokociśnieniowej iniekcji strumieniowej (jet-grouting)." Rozprawa doktorska, 2001. https://repolis.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=2320.
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Bzówka, Joanna. "Obliczeniowy model pala wykonanego techniką wysokociśnieniowej iniekcji strumieniowej (jet-grouting)." Rozprawa doktorska, 2001. https://delibra.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=2320.
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Filho, José Neurinei de Vasconcelos. "Estudo da requalificação das fundações do edifício Solar de Santana, Lisboa." Master's thesis, 2018. http://hdl.handle.net/10316/98015.
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Dissertação de Mestrado em Reabilitação de Edifícios apresentada à Faculdade de Ciências e TecnologiaA crescente procura de espaços habitáveis nas cidades associada à necessidade de requalificar e dinamizar os seus degradados centros históricos impulsionou decisivamente nos últimos anos a reabilitação urbana, sendo esta atualmente uma das áreas mais pujantes dentro do âmbito da Engenharia Civil. Contudo, a conciliação entre a preservação do patrimônio e as novas exigências construtivas reveste-se de dificuldade acrescida, sendo frequentemente necessário recorrer a soluções complexas e distintas das tidas como convencionais. Um dos aspetos mais desafiantes no projeto prende-se com a reabilitação/reforço das fundações, uma vez que estes elementos têm que ser redimensionados para resistir a novas e diferentes solicitações, não só para a fase de utilização do edifício, mas igualmente durante a fase de reabilitação, onde desempenham um papel fundamental na preservação das fachadas antigas do mesmo edifício. Neste trabalho procura-se, numa primeira fase, avaliar quais as vantagens e limitações das diversas soluções usualmente utilizadas na reabilitação de fundações de edifícios em ambiente urbano. Numa segunda fase é feito o acompanhamento da obra de reabilitação do edifício Solar de Santana em Lisboa, procurando-se aferir até que ponto é que a solução adaptada para as fundações e estrutura de contenção periférica tem um bom desempenho, face aos diversos condicionalismos existentes. Por último, com base no comportamento da obra, avalia-se a possibilidade de aperfeiçoar a solução proposta para as fundações visando obter uma potencial melhoria do desempenho/custo associado.
The growing demand for living spaces in the cities associated with the need to revitalize its degraded historic centers has decisively boosted urban rehabilitation in recent years, which is currently one of the most vigorous areas within the scope of Civil Engineering. However, reconciliation between heritage preservation and new constructive requirements is becoming harder in a way that complex and distinct solutions, different from the conventional ones, are often necessary. One of the most challenging aspects of these kind of project is the rehabilitation / reinforcement of the foundations, because these elements have to be resized to withstand new and different demands, not only for the charges over des years but also during the phase of rehabilitation where they play a key role in preserving the old façades of the building. In the first phase of this work we evaluate the advantages and limitations of the various solutions usually used in the rehabilitation of foundations of buildings in an urban environment. In a second phase, the rehabilitation project of the Solar de Santana building in Lisbon is monitored, trying to ascertain the extent to which the solution adapted to the foundations and peripheral containment structure performs, given the various constraints that exist. Finally, based on the behavior of the work, the possibility of improving the proposed solution for the foundations in order to obtain a potential improvement in associated performance / cost is evaluated.
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Juge, Benjamin. "Elastic Properties of Jet-Grouted Ground and Applications." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10909.
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With the development of urban areas and the constant need to change or improve the existing structures, a need for creative and less destructive soil reinforcement processes has occurred. Jet-grouting is one possible ground improvement technique. The behavior of the soil improved by jet-grouting is still not well understood. In this thesis, the mechanical behavior of the injected soil is modeled in order to determine the different parameters needed for the engineering design of a soil reinforcement based on jet-grouting. At first several models are presented in order to determine the extent of the injected zone within the soil mass, based on engineering parameters (cement poroelastic properties, injection rate). A model based on an energetic balance is proposed to compute the lower bound of the injection radius. The second part of the thesis focuses on the characterization of the uniaxial compressive strength of the soilcrete created in the injected area determined in the first part. Three different methods have been adapted to the problem. A hollow sphere model has been calibrated against published data. After calibration, both Eshelby's and averaging methods proved to provide results close to the reference data. The last part of this report presents numerical studies of the pile and of a group of piles. The study of the group of piles focuses on the effect of arching between soilcrete columns to reduce the vertical settlements due to urban tunneling at the surface. It appears that the values obtained for settlements in the presence of jet-grouted columns are much less important than in usual tunneling problems (with no reinforcement).
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Santos, Cláudia Sofia Neves dos. "Reforço de fundações em solos margosos." Master's thesis, 2014. http://hdl.handle.net/10362/14601.
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Os solos de natureza margosa apresentam, frequentemente, características geotécnicas menos favoráveis para funcionarem como terreno de fundação. Dadas as suas especificidades geotécnicas interessa o seu estudo, bem como, a avaliação da aplicabilidade e adequabilidade de diferentes métodos de reforço aos tipos de terreno em análise, que permitam ultrapassar limitações geomecânicas existentes.
Na presente dissertação visa-se estudar a caracterização geológica-geotécnica de solos de natureza margosa e analisa-los como material de aterro para fundações. Pretende-se, igualmente, abordar as principais técnicas de melhoramento aplicáveis aos terrenos indicados, expondo os aspectos mais relevantes.
Através de um estudo de caso, pretendeu-se analisar a temática escolhida num contexto real. Foi estudado o caso de fundações em aterros margosos que apresentaram comportamentos geotécnicos inadequados e onde foi preconizada a realização de trabalhos de reforço. A obra em estudo está localizada num empreendimento industrial perto de Coimbra e inclui duas ocorrências distintas onde foram implementadas soluções de reforço por jet grouting. As singularidades geotécnicas e estruturais de cada caso exigiram a adopção de diferentes abordagens da técnica, designadamente, soluções de jet grouting vertical e sub-horizontal. Ambos os casos foram analisados no que diz respeito às suas especificidades construtivas, comportamento geotécnico em fase de construção, soluções de reforço executadas e eficácia na mitigação dos problemas existentes.
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Tsai, Chi-chun, and 蔡琪駿. "The Effect of Jet Grouting on the Outward Displacement of Diaphragm Wall." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/50221646621979372553.
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碩士國立雲林科技大學
營建工程系碩士班
91
Since excessive deformation may lead to damage of adjacent buildings, it is important to limit the lateral displacements of retaining wall for deep excavation projects in urban area. In order to achieve this goal, auxiliary measures such as jet grouting within the excavation to improve the passive resistance of soil are often adopted. However, excessive outward displacement of diaphragm wall as a side effect of jet grouting was often reported. This study tried to model the side effect of jet grouting by numerical analyses. A 2-D finite difference code, FLAC, was used for parametric studies and case histories analyses. Parametric analyses indicated that the most pronounced factors that cause the diaphragm wall to displace outward are the magnitude of preloading pressure induced by jet grouting and the extent of preloading zone. Back-analyses on case histories showed that the outward squeezing effect of jet grouting could be correctly modeled by numerical method. Based upon the numerical results, it is concluded that the preloading pressure is about 1.1 to 1.4 times of the in-situ overburden pressure, while the preloading zone tends to move upward to the ground surface. The characteristics of deformation curves and the mechanism that leads to the outward displacement of diaphragm wall are also addressed. It is recommended that the effect of preloading due to jet grouting within the excavation zone be incorporated in deep excavation design, which may effectively cut down the cost of soil improvement.
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HSU, WEI-CHIANG, and 徐偉強. "Monitoring and Evaluating the Cutting Diameter of Jet Grouting Pile with Acoustic Method." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/sy8c5p.
Full textAbstract:
碩士國立臺灣科技大學
營建工程系
102
ABSTRACT Jet grouting is the most commonly used ground improvement method for the underground construction in Taipei city. However, the quality of the jet grouted columns is sensitive to the factors such as jet grouting practice, subsoil conditions, experience of contractor etc. To have a better control on the diameter of jet grouted column, this research uses a digital acoustic monitoring system to constantly monitor the sound generated from the jet cutting process of jet grouting method. Full scale field tests of this acoustic monitoring method were carried out in Japan as well as in the Southeast Asian region to account for the influence of changing geological conditions. The acoustic data gathered from the full scale tests were used to establish the relationship between jet cutting distance and recorded acoustic data on the diagram. The actual diameter of jet grouted column was checked by open cut method. Where the open cut method is not feasible, a jet cutting diameter prediction model obtained from literature was used instead. The suitability of the cutting diameter prediction model was verified by other open cut cases collected in this research. Using the relationship curves on the diagram, a critical curve for the jet grouting generated acoustic data can be established. When the acoustic sound at the recording location is above the critical curve, it indicates the jet cutting is effective and a jet grouted column with corresponding diameter can be form. If it is below the critical curve, jet grouted column with corresponding diameter cannot be form. This critical curve can be used to real time checking the effective cutting distance of the jet grouting method. Key Words: jet grouting method, cutting diameter prediction, acoustic monitoring method
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Marques, Daniela Alexandra Oliveira. "Reforço de solos de fundação com colunas de Jet Grouting encabeçadas por geossintéticos." Dissertação, 2008. http://hdl.handle.net/10216/58775.
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Marques, Daniela Alexandra Oliveira. "Reforço de solos de fundação com colunas de Jet Grouting encabeçadas por geossintéticos." Master's thesis, 2008. http://hdl.handle.net/10216/58775.
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Brás, João Miguel Pereira. "O uso de técnicas de Jet-Grouting ou similares em escavações em solos argilosos moles." Dissertação, 2009. http://hdl.handle.net/10216/58069.
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Brás, João Miguel Pereira. "O uso de técnicas de Jet-Grouting ou similares em escavações em solos argilosos moles." Master's thesis, 2009. http://hdl.handle.net/10216/58069.
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Kan, Daw-Liang, and 甘道良. "Case Study of The Effect of Cement Jet Grouting on the Outward Displacement of Diaphragm Wall." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/40483822211064798031.
Full textAbstract:
碩士中原大學
土木工程研究所
94
ABSTRACT Key words： Chemical Churning Pile、soft ground、diaphragm wall displacement Chemical Churning Pile is often used in deep excavation projects on soft ground. The purpose is to modify the geotechnical properties, to increases the strength of soil and passive soil pressure in the district, and to improve the liquefaction resistance of in-situ soil. It not only increases the stability of excavation, but also limits the lateral displacement of retaining walls. The case of this paper applies the expansive model of Chemical Churning Pile to modify soil properties directly inside the pile, and indirectly by permeating the soil mass outside the pile. It not only modifies the liquefaction resistant potential and limits the amount of diaphragm wall displacement effectively, but also increases the bearing force and the shear resistance of soil. However, it is frequently found that may induce the lateral outward displacement of diaphragm walls and the heave of the surrounding ground. Its displacement degree may exceed 10 cm, even cause the wall body to crack and seriously affect the project quality and security. Consider a great deal of documents and record, the outward movement of diaphragm walls is not induced by the seemingly high grouting pressure in fact, difficulties in expelling waste disposal from the grout hole or disturbing the soft surrounding ground excessively that leads to expansion of the soil mass is perhaps the governing mechanism. It causes the wall body to crack and the surrounding ground to shift excessively. So the supervision of constructional quality and procedure, and the choice of construction machinery are of utmost importance. The project case of this paper is near the Tamsui Line of Taipei Rapid Transit System. The demand of quality and the consideration of security are especially very rigorous. By the monitoring result and the effect of improving on the case, shows the case of a construction with good quality. So the author of this paper makes great efforts in many aspects to collect the materials and gather together whole to this project case, consult the domestic and the foreign papers and a great deal of experiences of project case. The mechanism that leads to the outward movements of diaphragm wall is also delineated via a theoretical approach. Analysis, assess and propose, and offer to the advanced persons of geotechnical engineering be the reference for the similar project case.
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Chen, Pu-Yen, and 陳步彥. "Quality Control of Jet Grouting at Basement by Measurements of Flow Rate and Gravity of Spoil Return." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/3347j9.
Full textAbstract:
碩士國立臺北科技大學
土木與防災研究所
100
JSG high pressure jet grouting method that was introduced to Taiwan more than 20 years ago, in general, is conducted on the ground or above groundwater table. There is no risk of water gushing or sand boiling during drilling and grouting operations. However, if drilling and grouting operations are performed in confined layer or in the basement and the groundwater level is above the platform of drilling and grouting operations, it is necessary to install pumping well to lower the groundwater level below operation platform before drilling and grouting in order to avoid the risk of water ingress, sand boiling, ground settlement and building tilting. This study to cusson how to install point wells and pumping wells when the jet grouting is conducted in the basement and the groundwater level is higher than the working platform of drilling and grouting operations. This study also proposes a quality control skill by measuring the volumes and unit weights of spoil returns twice for each column. The diameter of column is back calculated from these results of volumes and unit weights of returned spoil greater. This study also found that the greater the unit weight of spoil return, the greater the unit weight or better quality of column in the field. Since grouting sequence can affect the unit weight of spoil, optimum design of grouting layout and grouting sequence is important. By observing the variation trend of spoil volumes, sand boiling can be effectively detected. Based on the results of this study, it is recommended that the measurement of volume and unit weight of returned spoil should be listed in the standard operation procedure, especially when jet grouting platform is below the groundwater table.
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Mateus, Ricardo Daniel da Costa. "Escavações multi-escoradas em solos moles incorporando laje de fundo de jet grout e pré-esforço nas escoras." Dissertação, 2010. http://hdl.handle.net/10216/57970.
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Mateus, Ricardo Daniel da Costa. "Escavações multi-escoradas em solos moles incorporando laje de fundo de jet grout e pré-esforço nas escoras." Master's thesis, 2010. http://hdl.handle.net/10216/57970.
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Borges, Luís Gonçalo Alcântara. "A geotecnia na reabilitação de edifícios : estado da arte." Master's thesis, 2013. http://hdl.handle.net/10400.26/14342.
Full textAbstract:
A reabilitação urbana é um tema que tem vindo a assumir enorme importância ao longo da
última década em Portugal, nomeadamente pelo excesso de construção nova em detrimento
da reabilitação do edificado existente. A degradação do património edificado, com elevado
valor patrimonial, nomeadamente nas cidades mais antigas, fez com que os agentes
envolvidos na construção olhassem com cada vez maior interesse para este problema.
Contudo e com a alteração do padrão de vida é necessário adequar os edifícios antigos aos
tempos contemporâneos, melhorando-os nas condições de habitabilidade, conforto e
acessibilidade.
Nesse sentido, serão abordadas as principais soluções usadas na execução de contenções
periféricas, reforço e/ou recalçamento de fundações de edifícios. Proceder-se-á, ainda, à
análise das metodologias construtivas mais comuns, com descrição do seu campo de
aplicação e respetivas vantagens e desvantagens. Serão apresentados diversos casos de
obra, analisando as suas principais condicionantes e soluções adotadas em cada caso.
Finalmente, o presente trabalho pretende contribuir para melhor compreender os problemas
inerentes ao processo de reabilitação urbana, nomeadamente a execução de contenções
periféricas com ou sem recalçamento ou reforço de fundações, tendo em consideração as
técnicas ao dispor, os seus problemas construtivos e consequências de ordem geológicogeotécnica
e estrutural, em edifícios ou terrenos contíguos.
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Caramelo, Tiago André Lima Mimoso. "Aterros sobre solos moles reforçados com colunas de Jet Grout encabeçadas por geossintéticos." Dissertação, 2011. http://hdl.handle.net/10216/61247.
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Caramelo, Tiago André Lima Mimoso. "Aterros sobre solos moles reforçados com colunas de Jet Grout encabeçadas por geossintéticos." Master's thesis, 2011. http://hdl.handle.net/10216/61247.
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Gonçalves, José Miguel Ribeiro. "Reforço de solos de fundação com colunas de Jet-Grouting e plataformas de transferência de carga em betão armado." Dissertação, 2009. http://hdl.handle.net/10216/60453.
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