Готові списки джерел за темами / Shotcrete methods

Добірка наукової літератури з теми "Shotcrete methods"

Автор: Grafiati
Опубліковано: 4 травня 2022
Оновлено: 5 травня 2022

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Статті в журналах з теми "Shotcrete methods":

1

Shi, Yan, Jia Zheng Li, Jian Jun Yan, and Shang Shi Peng. "Study on Indoor Detecting Methods and Performance of Shotcrete." Advanced Materials Research 652-654 (January 2013): 1217–20. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.1217.

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Using self-designed indoor detecting methods, the performance test of shotcrete doped compound admixture and crude fiber were carried out. The results showed that compound admixture and crude fiber can improve the compressive strength, flexural toughness and crack resistance of shotcrete. Axial bond strengths of shotcrete with rock were more than 1.0MPa, and that can be increased by combined-doped compound admixture and crude fiber. Rebound rates of shotcrete were 23% and 20%, layer thickness in one shot cycle were 22cm and 25cm, and combined-doped compound admixture and fiber can increase the cohesiveness and reduce rebound rate. Self-designed methods can be used to compare construction performance of different shotcretes.
2

Ou, Zhe, Cong Xin Chen, Guan Wen Cheng, and Yun Zheng. "Study on the Theory and Methods of Bolt-Shotcrete Support for Weak Surrounding Rock Based on Reliability Analysis." Applied Mechanics and Materials 444-445 (October 2013): 1446–53. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.1446.

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The evaluation of stability and reliability of support system for tunnel weak surrounding rock are difficult issues of concern in rock and soil engineering. Aiming at the problem of parameter design and reliability evaluation of tunnel weak surrounding rock and bolt-shotcrete support system, the deformation, failure mechanism and physical mechanical properties of weak surrounding rock are analyzed as well as the mechanism of bolt-shotcrete support in soft rock is studied. And the reliability analysis equation of bolt-shotcrete support in two kinds of weak surrounding rock (nearly horizontal layered mechanics medium and continuum mechanics medium) is established. The quantitative soft rock supporting theory is introduced into the reliability analysis equation. The calculation formula of two important design parameters of anchoring force and bolt spacing in bolt-shotcrete support is established. Finally an engineering example is adopted to prove the rationality of the calculation results. Therefor this paper provides theoretical basis and design method for supporting structure design and reliability evaluation of tunnel weak surrounding rock.
3

Kim, Jeong Soo, and Moon Kyum Kim. "Finite Element Analysis of Steel-Shotcrete Composite Using the Fiber Beam-Column Element." Applied Mechanics and Materials 275-277 (January 2013): 1359–63. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.1359.

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Owing to strong nonlinearity of shotcrete and difficulty of determining the equivalent material properties of steel-shotcrete composites for numerical analysis, methods are required to estimate nonlinear behavior of steel-shotcrete composite in the computational aspect efficiently. In this study, the behavior of steel-shotcrete composites, main primary supports in the NATM tunnel, are estimated by finite element method using the fiber beam-column element. The numerical results are compared with results of uniaxial and flexural test. Results of comparison show that finite element analysis of using fiber beam-column element can be an efficient tool of estimating the steel-shotcrete composite as the primary support in the NATM tunnel.
4

Shehata, Medhat, Mike Navarra, Tom Klement, Mohamed Lachemi, and Hannah Schell. "Use of wet cellulose to cure shotcrete repairs on bridge soffits. Part 2: Laboratory testing and analysis." Canadian Journal of Civil Engineering 33, no. 7 (July 1, 2006): 815–26. http://dx.doi.org/10.1139/l06-024.

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This paper reports results of an experimental program conducted to investigate the quality of shotcrete cured by wet, sprayed-on cellulose fibers. The program also investigated the quality of shotcrete containing accelerator. Both field and laboratory samples were prepared and cured using air-curing, curing compound, misting and curing compound, or cellulose. At the end of the curing period, cores were collected from the test panels and tested. The results showed that the effects of curing are noticeable mainly at the top 15 mm of the shotcrete surface. Within this part of the shotcrete, cellulose-cured panels showed an enhanced pore structure compared to samples cured using traditional curing methods, as reflected by mercury intrusion porosimetry and sorptivity test results. The quality of the surface of cellulose-cured shotcrete was significantly enhanced when the additives added to commercially available cellulose to improve its fire resistance were eliminated. Adhesive added to improve bonding of cellulose fibers to the shotcrete surface did not have a negative effect on the surface of the shotcrete. Laboratory-prepared samples showed evidence that cellulose curing reduces shrinkage cracking. The use of accelerator was found to adversely affect the strength and durability of the shotcrete.Key words: bridge repair, shotcrete, accelerator, salt scaling, curing, cellulose, permeability, sorptivity, pore structure, degree of hydration.
5

Mohajerani, Abbas, Daniel Rodrigues, Christian Ricciuti, and Christopher Wilson. "Early-Age Strength Measurement of Shotcrete." Journal of Materials 2015 (November 10, 2015): 1–10. http://dx.doi.org/10.1155/2015/470160.

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Shotcrete or sprayed concrete is a special concrete designed for spraying onto a surface, as a construction material. With shotcrete application as a ground support system ever-present in both mining and tunnelling sectors, a major requirement of drive progression is to determine when it is safe to reenter beneath freshly sprayed concrete. Accurately determining this time is of paramount importance. Generally, this reentry time is based on measuring the developing strength of shotcrete until an adequate strength value is reached. The issue with current practice is that there is no widely accepted or generally preferred method that accurately assesses the shotcrete lining’s true early-age strength. However, there are a number of strength tests that are commercially available and used in the industry; these include the soil penetrometer, needle penetrometer, bolt screws, beam end testers, and drilled core samples. This paper researches into these testing methods and their characteristics in order to determine their accuracy, testing ranges, and suitability for in situ use in the tunnelling and mining industry. The investigation ultimately reveals that current methods all have substantial shortcomings. Based on these findings, recommendations are proposed for the applicable use of the current testing methods and recommendations for future improvements.
6

Yao, Fei, and Yimin Cao. "Research on Ultrasonic Testing with Wavelet Packet Analysis for Shotcrete." Materials Evaluation 79, no. 10 (October 1, 2021): 1005–15. http://dx.doi.org/10.32548/2021.me-04217.

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Shotcrete structures are widely used in tunnel engineering. Quality inspection is difficult, and the traditional ultrasonic testing (UT) method based on first arrival velocity has limitations. In this paper, shotcrete-rock specimens were made in a laboratory and evaluated using UT. Wavelet packet decomposition is introduced for better frequency analysis of the condition evaluation. Two methods, including calculation of the energy eigenvalues and machine learning, are used to describe the contact quality at the interface between the shotcrete and rock. The relative energy eigenvalue increases with the gradual reduction of contact quality, which can become a quantitative index of the contact quality. Machine learning performed well in the rapid recognition of discontinuities in the multiple-classification models. Both methods based on wavelet packet decomposition achieved good results in identifying discontinuities and have the potential to be used in practical engineering applications.
7

Liu, Guoming, Qianqian Xu, Jipeng Zhao, Wen Nie, Qingkun Guo, and Guanguo Ma. "Research Status of Pathogenesis of Pneumoconiosis and Dust Control Technology in Mine—A Review." Applied Sciences 11, no. 21 (November 3, 2021): 10313. http://dx.doi.org/10.3390/app112110313.

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Pneumoconiosis has become one of the biggest threats to the occupational health and life safety of mining workers in China. The number of pneumoconiosis cases has continued to rise in recent years. The main task of occupational health development is to study the pathogenesis of pneumoconiosis and to develop mine dust prevention and control technology. Therefore, this paper summarizes the research progress of coal worker pneumoconiosis and dust prevention and control in mines. Firstly, the research progress of coal worker pneumoconiosis is analyzed from the aspects of pathogenesis, animal model and pathological changes of coal worker pneumoconiosis. Then, the existing basic theory and technology of dust prevention are described, including ventilation and dust removal, spray and dust suppression, and chemical dust suppression methods. Finally, based on the dust removal theory of wet shotcrete, the progress of shotcrete dust control technology and equipment used for shotcrete is summarized from the aspects of shotcrete technology process and shotcrete materials. At the same time, in view of the shortcomings of the existing research, the next research prospect is given in the pathogenesis of pneumoconiosis, intelligent dust prevention, jet spraying dust removal and so on. This paper provides theoretical support for realizing the separate source and efficient treatment of mine dust control and helps to improve the clean production level of mine, control and prevent pneumoconiosis.
8

Ajalloeian, R., A. R. Samadi Soofi, and M. Salavati. "Engineering Geological Assessment of Diversion Tunnel of Bakhtiari Damsite (Biggest Two-Arch Concrete Dam in Southern Iran)." Journal of Geological Research 2012 (October 4, 2012): 1–8. http://dx.doi.org/10.1155/2012/839050.

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Bakhtiari dam is located on the Bakhtiari river, 120 km away from the north of the Andimeshk city. Upper diversion tunnel of this dam with large cross section (13.7 m excavation diameter) and more than 1 km length is a huge construction. The tunnel is placed in the Sarvak formation carbonate rocks of Bangestan group which passes through seven different geological zones with various specifications (SV1, SV2, SV3, SV4, SV5, SV6, and SV7). Joint studies show two main discontinuit including bedding and a main group of joint (J1) together with random joints (faults and fractures). Most of discontinuities have been filled mainly by calcite or calcite and clay. Data deduced from testing and analysis shows good-to-excellent RQD classes with 75 to 90 values. Based on RMR and Q methods, generally rock masses have good to very good quality with 61 to 95 values for RMR and 10 to 35 values for Q. Based on conducted stability analysis, suitable supports were suggested for tunnel by RMR and Q methods. As a result, it can be concluded that all units have a good stability. Therefore, systematic rock bolting with 40–50 mm unreinforced shotcrete has been proposed for some special place. For rock support, according to RMR method, 3 m rock bolts in crown, 2.5 m spacing and with 50 mm shotcrete in crown has been proposed also 3 m rock bolts, based on Q method, 2.3-2.4 m spacing with systematic Bolting without shotcrete or 40 mm unreinforced shotcrete in some units, has been proposed. According to RMR method, for SV5 zone with very good and excellent quality, local 33 bolting without shotcrete and 3m rock bolts, 3 m spacing and spot bolting according to Q method has been proposed.
9

Hubáček, Adam, Jiří Brožovský, and Rudolf Hela. "Comparison of Properties of Shotcrete Tested Using Destructive and Non-destructive Methods." Procedia Engineering 65 (2013): 63–68. http://dx.doi.org/10.1016/j.proeng.2013.09.012.

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10

Yang, Xiaojie, Chaowen Hu, Jianhui Liang, Yubo Zhou, Guofeng Ni, and Ruifeng Huang. "A Case Study on the Control of Large Deformations in a Roadway Located in the Du’erping Coal Mine in China." Advances in Materials Science and Engineering 2019 (April 28, 2019): 1–13. http://dx.doi.org/10.1155/2019/9628142.

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The effective control of large roadway deformations has always been a focus and difficulty in the coal industry. At present, a “bolt + cable + mesh + shotcrete” combined support structure has been widely used in China to support roadways with large deformations, and this method has achieved some success. However, large roadway deformations supported by using the “bolt + cable + mesh + shotcrete” support structure still have a series of engineering problems. This paper describes a case study of large deformation control in a roadway surrounded with broken rock located in the Du’erping coal mine in the Shanxi Province of China. A new “shell + bolt + shotcrete” combined support structure is proposed to support the north wing main haulage roadway. Methods were adopted from theoretical analysis, numerical simulation, and similarity simulation experiments to design a reinforced shell within a vertical wall semicircular arch. Roadway convergence and surrounding rock stress were monitored on the site. The monitoring data showed that the new support structure successfully controlled a potentially large deformation of the roadway. This new combined support structure provides a helpful reference for the design and engineering of support structures to prevent large roadway deformations.
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Статті в журналах

Дисертації з теми "Shotcrete methods":

1

Oliveira, Társis Rafael Silva Travassos. "Modelagem do suporte de túneis com comportamento viscoelástico usando o método dos elementos de contorno." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3144/tde-27102016-134931/.

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Mesmo com os avanços na aplicação de métodos numéricos em engenharia, a simulação computacional da escavação de túneis ainda apresenta um baixo grau de precisão e de representação. Os modelos de escavação de túneis normalmente utilizam domínios com extensão infinita ou semi-infinita. Esta característica impacta negativamente as simulações numéricas baseadas no Método dos Elementos Finitos (MEF), pois uma superfície fictícia deve ser utilizada para limitar a geometria do modelo. De maneira inversa, a modelagem dos domínios infinitos é naturalmente integrada nos modelos baseados no Método dos Elementos de Contorno (MEC), já que apenas uma representação discreta dos contornos de um modelo precisa ser considerada. Em geral, as simulações computacionais realísticas de obras de túneis envolvem uma combinação de materiais estruturais e geotécnicos como solo, rocha, concreto estrutural, concreto projetado e elementos estruturais metálicos. Assim, os modelos de túneis podem ter camadas de materiais com propriedades diferentes, intactos ou fragmentados. O objetivo deste trabalho é realizar modelagens bidimensionais da estrutura de suporte de túneis com comportamento viscoelástico usando o MEC. O presente desenvolvimento também apresenta um novo algoritmo para simulação da interação maciço-concreto projetado usando uma abordagem pura do MEC. Esta pesquisa está incorporada em um projeto maior, voltado para o desenvolvimento de novos algoritmos para simulações numéricas precisas da escavação de túneis. Os desenvolvimentos anteriormente realizados por Noronha e Pereira (2003), Pereira (2004), Müller (2004) e Carbone (2007) foram fundamentais para o desenvolvimento do presente trabalho.
Despite the progress in numerical methods applied to engineering, computational simulation of tunnel excavation still presents a low degree of accuracy and representativeness. Tunnel excavation models normally use infinite or half-infinite domains. This feature negatively impacts numerical simulations based on the Finite Element Method (FEM), since a fictitious bounding surface must be used to truncate the model geometry. Inversely, infinite domain modeling is intrinsic to the Boundary Element Method (BEM), since it requires a boundary-only representation. A realistic computational simulation of tunnel excavation involves structural and geotechnical materials like rock, structural concrete, shotcrete and rebar rock bolts and anchors. This implies that tunnels models may be composed of layers with different material properties, intact of fragmented. The main goal of this work is to carry out 2D modeling of tunnel support using the BEM and viscoelastic material models. The work also presents a new algorithm to simulate the rock-shotcrete interaction based on a pure-BEM approach. This research is integrated into a bigger study, which integrates new software developments for accurate numerical simulation of tunnel excavation. The previous research development proposed by Noronha and Pereira (2003), Pereira (2004), Müller (2004) and Carbone (2007) were particularly relevant to the present study.
2

El, zain Nadia. "An experimental study of the validity of the round panel test method for shotcrete." Thesis, KTH, Betongbyggnad, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230981.

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Shotcrete (sprayed concrete) was used for the first time in 1914 and has become of  growing importance in stabilizing the excavated tunnel sections over the past century.  Even though the technology develops, there are some difficult tasks such as the design of a bolt anchored tunnel lining made of shotcrete. A proven and established design method does not exist today; instead the design of tunnel linings are based on trial and error or experience from similar projects. One method used today, to determine the actual structural behavior of fiber reinforced shotcrete, is the standard beam test method. Previous studies have shown that the beam method gives scattered results since the testing volume are relatively small and the fibers might be unevenly distributed.  In 1998, an alternative to determine the actual structural behavior of reinforced shotcrete was proposed, based on using round determinate panels. In 2004 this method became a part of the American Society for Testing and Materials, ASTM, standards. The method has the potential of becoming a major, reliable test procedure that better reproduce the behavior of reinforced shotcrete in situ, compared to test beams. An experimental test series was performed to compare the different testing methods in terms of data variability and validity, in the laboratory of Vattenfall in Älvkarleby. The experiment was performed on 30 specimens in total, with five different concrete recipes. The difference in the recipe was the fiber and cement content. The round panels are designed according to ASTM C-1550 and the beams according to SS-EN14488-3. The results from the experiment is here presented and evaluated, and also including the data variability and validity for the proposed method. The two basic testing methods of using beams and round panels are investigated, compared and evaluated, and their advantages and disadvantages discussed.
Sprutbetong användes första gången år 1914 och har under det gångna århundradet blivit allt viktigare för att stabilisera utsprängda tunnelsektioner. Trots att tekniken utvecklas finns det svårigheter med att exempelvis utforma bultförankrade tunnelbeklädnader av sprutbetong. En beprövad och etablerad metod att konstruera sprutbetongbeklädnad existerar inte idag. Istället används erfarenhetsåterföring från tidigare projekt och/eller experimentella försök. En testmetod som används idag för att återskapa beteendet hos sprutbetong är balkförsök. Tidigare studier har däremot visat att resultaten från försöken oftast har stor spridning vilket kan bero på att brottytorna är små areor där fibrerna kan vara ojämnt fördelade vilket påverkar resultaten. År 1998 föreslogs en alternativ metod för att fastställa de mekaniska egenskaperna hos sprutbetong, baserat på användning av runda plattor. År 2004 blev denna metod en del av the American Society for Testing and Materials, ASTM, standarder. Metoden har potential att bli en viktigt och tillförlitligt testmetod som mer realistiskt efterliknar beteendet hos fiberarmerad sprutbetong jämfört med balkprovning. En experimentell försöksserie har genomförts hos Vattenfall i Älvkarleby, för att jämföra de två metoderna med avseende på mätosäkerhet. Försöksserien är på totalt 30 prover, där fem olika betongrecept använts. Cementmängden och fiberhalten varierade mellan de olika recepten. De runda plattorna är utförda enligt ASTM C-1550 och balkarna enligt SS-EN14488-3. Resultaten från försöken har redovisats och utvärderats, och en mätosäkerhersanalys presenteras för metoden ASTM C-1550. Korrelationen mellan resultaten från de två metoderna är beräknad och varianskoefficienten presenteras. För- och nackdelar mellan båda testmetoderna diskuteras.
3

Helan, Tomáš. "Možnosti laboratorní přípravy a testování stříkaných betonů." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225877.

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The master's thesis is focused on the posibility of laboratory testing of shotcrete. The important point of the thesis is properties comparison of shotcrete made in laboratory with vibrating press and concrete with the same recipe made by spraying machine. The influence of shotcrete recipe, type and dosage of accelerating ingredient is also examined.
4

Ahmed, Lamis. "Models for analysis of young cast and sprayed concrete subjected to impact-type loads." Doctoral thesis, KTH, Betongbyggnad, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168211.

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The strive for a time-efficient construction process naturally put focus on the possibility of reducing the time of waiting between stages of construction, thereby minimizing the construction cost. If recently placed concrete, cast or sprayed, is exposed to impact vibrations at an early age while still in the process of hardening, damage that threatens the function of the hard concrete may occur. A waiting time when the concrete remains undisturbed, or a safe distance to the vibration source, is therefore needed. However, there is little, or no, fully proven knowledge of the length of this distance or time and there are no established guidelines for practical use. Therefore, conservative vibration limits are used for young and hardening concrete exposed to vibrations from e.g. blasting. As a first step in the dynamic analysis of a structure, the dynamic loads should always be identified and characterized. Here it is concluded that impact-type loads are the most dangerous of possible dynamic loads on young and hardening concrete. Shotcrete (sprayed concrete) on hard rock exposed to blasting and cast laboratory specimens subjected to direct mechanical impact loads have been investigated using finite element models based on the same analysis principles. Stress wave propagation is described in the same way whether it is through hard rock towards a shotcrete lining or through an element of young concrete. However, the failure modes differ for the two cases where shotcrete usually is damaged through loss of bond, partly or over larger sections that may result in shotcrete downfall. Cracking in shotcrete due to vibrations only is unusual and has not been observed during previous in situ tests. The study of shotcrete is included to demonstrate the need of specialized guidelines for cases other than for mass concrete, i.e. structural elements or concrete volumes with large dimensions in all directions. Within this project, work on evaluating and proposing analytical models are made in several steps, first with a focus on describing the behaviour of shotcrete on hard rock. It is demonstrated that wave propagation through rock towards shotcrete can be described using two-dimensional elastic finite element models in a dynamic analysis. The models must include the material properties of the rock and the accuracy of these parameters will greatly affect the results. It is possible to follow the propagation of stress waves through the rock mass, from the centre of blasting to the reflection at the shotcrete-rock interface. It is acceptable to use elastic material formulations until the strains are outside the elastic range, which thus indicates imminent material failure. The higher complexity of this type of model, compared with mechanical models using mass and spring elements, makes it possible to analyse more sophisticated geometries. Comparisons are made between numerical results and measurements from experiments in mining tunnels with ejected rock mass and shotcrete bond failure, and with measurements made during blasting for tunnel construction where rock and shotcrete remained intact. The calculated results are in good correspondence with the in situ observations and measurements, and with previous numerical modelling results. Examples of preliminary recommendations for practical use are given and it is demonstrated how the developed models and suggested analytical technique can be used for further detailed investigations. The modelling concept has also been used for analysis of impact loaded beams and concrete prisms modelled with 3D solid elements. As a first analysis step, an elastic material model was used to validate laboratory experiments with hammer-loaded concrete beams. The laboratory beam remained un-cracked during the experiments, and thus it was possible to achieve a good agreement using a linear elastic material model for fully hardened concrete. The model was further developed to enable modelling of cracked specimens. For verification of the numerical results, earlier laboratory experiments with hammer impacted smaller prisms of young concrete were chosen. A comparison between results showed that the laboratory tests can be reproduced numerically and those free vibration modes and natural frequencies of the test prisms contributed to the strain concentrations that gave cracking at high loads. Furthermore, it was investigated how a test prism modified with notches at the middle section would behave during laboratory testing. Calculated results showed that all cracking would be concentrated to one crack with a width equal to the sum of the multiple cracks that develop in un-notched prisms. In laboratory testing, the modified prism will provide a more reliable indication of when the critical load level is reached. This project has been interdisciplinary, combining structural dynamics, finite element modelling, concrete material technology, construction technology and rock support technology. It is a continuation from previous investigations of the effect on young shotcrete from blasting vibrations but this perspective has been widened to also include young, cast concrete. The outcome is a recommendation for how dynamic analysis of young concrete, cast and sprayed, can be carried out with an accurate description of the effect from impact-type loads. The type of numerical models presented and evaluated will provide an important tool for the work towards guidelines for practical use in civil engineering and concrete construction work. Some recommendations on safe distances and concrete ages are given, for newly cast concrete elements or mass concrete and for newly sprayed shotcrete on hard rock.

QC 20150529

5

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.
6

Škapová, Pavla. "Problematika testování stříkaných betonů." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226742.

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The master‘s thesis focuses on testing the shotcrete prepared in laboratory conditions. The main observed properties are compresive strenght of shotcrete and modulus of elasticity. The aim is assessment of methods for measuring those parameters. The calibrating correlations for strenght characteristics of shotcrete are given by obtaining the results of used methods. The shotcrete composition, amount and type of accelerating additive as well as economic aspect of using shotcrete is also assessed.
7

Vrána, Tomáš. "Návrh sekundárního městského kolektoru s důrazem na ochranu před průnikem podzemní vody." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227276.

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In the first part, the master’s thesis deals with the history of utility tunnels, methods of construction processes and materials from which they are built. It also mentions methods and materials which protect against the effects of groundwater. The thesis is mainly dedicated to the design and structural design of the secondary utility tunnel lining with an emphasis on protection against ingress of groundwater. The mathematical model was created in Plaxis 2DAE software.
8

Kobielusz, Petr. "Městský okruh Blanka, tunel Královská obora - ražená část, stavebně technologická příprava stavby." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226100.

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My thesis is focused on process preparation and building construction technology of primary lining road tunnel, implemented in city part of Troja in the capital city Prague. Specifically it is a part of tunnel complex Blanka. The name of this part is Kralovská obora. If the all tunnel parts are built this tunnel complex Blanka can be complemented to already opened tunnels Zlíchovský, Mrázovka and Strahovský which are the part of city traffic circle. This technology preparation includes schedules and financial plans of the building, technological prescription for the primary tunnel lining, safety plan, control and trial/test plans, environmental plan, project of construction site, design of the main working machines, items budget of the north tunnel tube, coordination situation plan with wider relationships transport routes and technical report of building technological project.
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Сливчук, Роман Іванович. "Технологія торкретування для відновлення захисного шару залізобетонних конструкцій при ремонті та реконструкції". Магістерська робота, 2021. https://dspace.znu.edu.ua/jspui/handle/12345/6583.

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Сливчук Р. І. Технологія торкретування для відновлення захисного шару залізобетонних конструкцій при ремонті та реконструкції : кваліфікаційна робота магістра спеціальності 192 «Будівництво та цивільна інженерія» / наук. керівник В. І. Анін. Запоріжжя : ЗНУ, 2021. 110 с.
UA : В роботі на основі аналізу та систематизації даних наукових досліджень виявлені принципи втрати експлуатаційної придатності залізобетонних конструкцій. Визначена перевага використання торкретування, яка полягає у можливості повної механізації процесів, та у поєднанні в одній технологічній послідовності транспортування, укладання та ущільнення бетонної суміші. Значну увагу приділено технологічним питанням одержання та застосування у будівельній практиці торкрет-фібробетону, особливостям створення захисних покриттів з використанням цього матеріалу, сформульовані вимоги до підбору вихідних матеріалів для отримання покриттів, а також рекомендації та правила, що стосуються технології їх нанесення. Наведено приклади різних варіантів конструктивних рішень торкрет-бетонних та торкрет-фібробетонних покриттів стосовно підземних та наземних будівельних об'єктів.
EN : The principles of loss of serviceability of reinforced concrete structures are revealed in the work on the basis of the analysis and systematization of the data of scientific researches. The advantage of using shotcreting is determined, which consists in the possibility of complete mechanization of processes, and in combination in one technological sequence of transportation, laying and compaction of concrete mix. Considerable attention is paid to technological issues of production and application of shotcrete-fiber concrete in construction practice, features of creating protective coatings using this material, formulated requirements for the selection of raw materials for coatings, as well as recommendations and rules for their application technology. Examples of different variants of design solutions of shotcrete-concrete and shotcrete-fiber-concrete coverings concerning underground and above-ground construction objects are given.

Книги з теми "Shotcrete methods":

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Great Britain. Health and Safety Executive., ed. Safety of New Austrian Tunnelling Method (NATM) tunnels: A review of sprayed concrete lined tunnels with particular reference to London clay. Sudbury, Suffolk: HSE Books, 1996.

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Частини книг з теми "Shotcrete methods":

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Erichsen, C. "Berg Bock Freeway Tunnel: optimizing the heading technique and the operational safety for the tunnel built by the shotcrete method." In (Re)Claiming the Underground Space, 455–60. London: Routledge, 2022. http://dx.doi.org/10.1201/9780203741184-82.

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La-Fuente, Jhoseph, Saac Huacho, Humberto Pehovaz-Alvarez, and Carlos Raymundo. "Shotcrete Elaboration Method Using Geopolymer Cement Product of the Alkaline Activation of Tailings for the Support of Underground Work in Polymetallic Mines of Peru." In Advances in Manufacturing, Production Management and Process Control, 254–62. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-80462-6_32.

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Lechner, M., Ch Hellmich, and H. A. Mang. "Short-term creep of shotcrete - thermochemoplastic material modelling and nonlinear analysis of a laboratory test and of a NATM excavation by the Finite Element Method." In Continuous and Discontinuous Modelling of Cohesive-Frictional Materials, 47–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44424-6_4.

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"SHOOTABILITY OF FRESH SHOTCRETE." In Production Methods and Workability of Concrete, 107–20. CRC Press, 2004. http://dx.doi.org/10.1201/9781482271782-18.

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Clements, M. J. K. "Comparison of methods for early age strength testing of shotcrete." In Shotcrete: More Engineering Developments, 81–87. CRC Press, 2004. http://dx.doi.org/10.1201/9780203023389-8.

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Clements, M. "Comparison of methods for early age strength testing of shotcrete." In Shotcrete: More Engineering Developments, 81–87. Taylor & Francis, 2004. http://dx.doi.org/10.1201/9780203023389.ch8.

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Schädlich, B., and H. Schweiger. "A new constitutive model for shotcrete." In Numerical Methods in Geotechnical Engineering, 103–8. CRC Press, 2014. http://dx.doi.org/10.1201/b17017-20.

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Pöttler, R. "Numerical investigation of the failure of a shotcrete lining." In Numerical Methods in Geotechnical Engineering, 313–18. Taylor & Francis, 2006. http://dx.doi.org/10.1201/9781439833766.ch45.

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Tani, T., T. Aoki, T. Ogawa, and Y. Fujii. "Consideration on the tunnel supporting effectiveness of shotcrete with a time-dependent viscoelastic model." In Computer Methods and Recent Advances in Geomechanics, 1969–74. CRC Press, 2014. http://dx.doi.org/10.1201/b17435-350.

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Neuner, M., M. Schreter, and G. Hofstetter. "Comparative investigation of constitutive models for shotcrete based on numerical simulations of deep tunnel advance." In Numerical Methods in Geotechnical Engineering IX, 103–10. CRC Press, 2018. http://dx.doi.org/10.1201/9781351003629-13.

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Тези доповідей конференцій з теми "Shotcrete methods":

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Sment, Jeremy N., Matthew Lambert, Kevin J. Albrecht, Clifford K. Ho, and Murphy Davidson. "Application Methods for Refractory Insulation in Hot Particle Storage Bins." In ASME 2021 15th International Conference on Energy Sustainability collocated with the ASME 2021 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/es2021-63923.

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Abstract The National Solar Thermal Test Facility (NSTTF) at Sandia National Laboratories is conducting research on a Generation 3 Particle Pilot Plant (G3P3) that uses falling sandlike particles as the heat transfer medium. G3P3 proposes a system with 6 MWh of thermal energy storage in cylindrical bins made of steel that will be insulated internally using multiple layers of refractory materials[1]. The refractory materials can be applied by stacking pre-cast panels in a cylindrical arrangement or by spraying refractory slurry to the walls (shotcrete). A study on the two methods determined that shotcrete would be the preferred method in order to minimize geometric tolerance issues in the pre-cast panels, improve repairability, and to more closely resemble commercial-scale construction methods. Testing and analysis was conducted which showed shotcrete refractories could be applied with minimal damage and acceptable heat loss.
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Tatnall, Peter C. "Standards, Test Methods, and Guides for Shotcrete Ground Support." In 10th International Conference on Shotcrete for Underground Support. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40885(215)2.

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Song, Ki-Il, and Gye-Chun Cho. "Health Monitoring of Tunnel Shotcrete Lining Using Nondestructive Testing Methods." In GeoFlorida 2010. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41095(365)240.

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Veenstra, Ryan, Xu Zhao, Andries Fourie, and Johannes Grobler. "A comparison of cemented paste backfill shotcrete barricade design methods." In Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings. Australian Centre for Geomechanics, Perth, 2021. http://dx.doi.org/10.36487/acg_repo/2115_33.

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Marlow, Paul, and Peter Mikula. "Shotcrete ribs and cemented rock fill ground control methods for stoping in weak squeezing rock at Wattle Dam Gold Mine." In Seventh International Symposium on Ground Support in Mining and Underground Construction. Australian Centre for Geomechanics, Perth, 2013. http://dx.doi.org/10.36487/acg_rep/1304_07_mikula.

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Gowda, Chandan C., Joaquim A. O. Barros, and Maurizio Guadagnini. "Torsional strengthening of thin-walled tubular reinforced concrete structures using NSM-CFRP laminates: Experimental work." In IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/guimaraes.2019.1712.

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<p>Torsional strengthening of thin walled tubular reinforced concrete elements, such as bridge box girders and spandrel beams, has received only limited attention, and investigations generally focus on the use of conventional strengthening methods such as span shortening, steel encasing, member enlargement, shotcrete etc. However, research on the use of innovative fibre reinforced polymers (FRP) as near surface mounted (NSM) reinforcement for torsional strengthening is still very limited and more work should be undertaken to examine the full potential of the NSM technique over more traditional solutions. The current paper assesses experimentally, four different strengthening configurations using NSM technique applied on three faces of two beams using straight CFRP laminates, and on four faces of two beams using special L-CFRP laminates.</p><p>The results show that the proposed strengthening configurations can effectively control crack propagation and increase the torsional moment carrying capacity of the RC element, thus resulting in increased performance and durability.</p>
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Wrock, Michael R., and Scott B. Nokleby. "Robotic Shotcrete Thickness Estimation Using Fiducial Registration." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85688.

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This paper presents the results of shotcrete thickness estimation for mining applications using a mobile robot. The method uses a fiducial marker based registration method to align initial and posterior LIDAR scans. The shotcrete thickness was calculated using point to point estimation. The registration and thickness estimation were tested in a mock mine using a LIDAR scanner on a mobile robot. It was found that the registration based thickness estimates had repeatability within a millimeter when compared to thickness estimates generated without the need for registration.
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Doolan, Jeremy, and Ian Hulls. "A rapid method for highlighting shotcrete performance issues in underground mines." In Seventh International Symposium on Ground Support in Mining and Underground Construction. Australian Centre for Geomechanics, Perth, 2013. http://dx.doi.org/10.36487/acg_rep/1304_41_doolan.

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Fang, Shiyu, Degang Xu, and Qing Song. "Detection Method of Wet Shotcrete Images in Complex Tunnel Construction Environment." In 2020 39th Chinese Control Conference (CCC). IEEE, 2020. http://dx.doi.org/10.23919/ccc50068.2020.9189293.

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Higashi, Yukihiro, Bo Li, and Yujing Jiang. "Reinforcement effect of PCM shotcrete method using FRP grid for tunnel maintenance." In 2012 International Conference on Renewable Energy Research and Applications (ICRERA). IEEE, 2012. http://dx.doi.org/10.1109/icrera.2012.6477362.

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