Thematische Bibliographien / Geotextilien

Auswahl der wissenschaftlichen Literatur zum Thema „Geotextilien“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 18. Februar 2022

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Zeitschriftenartikel zum Thema "Geotextilien":

Prambauer, Martina, Christoph Burgstaller, Manuel Eicher und Helene Hofmann. „Die Verwendung von bioabbaubaren Polyestern in saisonalen Geotextilien“. geotechnik 43, Nr. 1 (10.02.2020): 26–30. http://dx.doi.org/10.1002/gete.201900022.

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Heerten, Georg, und Wilhelm Wilmers. „Reparatur eines Staudammes in Burkina Faso mit Geotextilien als Erosionssicherung“. WASSERWIRTSCHAFT 102, Nr. 1-2 (Januar 2012): 17–23. http://dx.doi.org/10.1365/s35147-012-0204-2.

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Palmeira, E. M., R. J. Fannin und Y. P. Vaid. „A study on the behaviour of soilgeotextile systems in filtration tests“. Canadian Geotechnical Journal 33, Nr. 6 (01.12.1996): 899–912. http://dx.doi.org/10.1139/t96-120.

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The behaviour of soilgeotextile systems in filtration tests is reported for nonwoven geotextiles under unidirectional flow. A new apparatus was developed to preform filtration tests under an applied vertical stress, and tests were then conducted with different soils and nonwoven geotextiles in order to evaluate the clogging potential and retention capacity of these materials under rather severe combinations of geotextile and soil characteristics. Results show that the geotextiles perfomed well and that observed permeability losses were acceptable even for gradient ratios close to 3. No progressive piping was observed, and it is believed that the retention capacity of the geotextiles may be influenced by their manufacturing process. In general, theoretical predictions for the maximum particle size passing through the geotextile compared well with measurements. Key words: geotextiles, filtration, gradient ratio, permeability, soil retention, clogging.

Eigenbrod, K. D., J. P. Burak und J. G. Locker. „Differential shear movements at soil-geotextile interfaces“. Canadian Geotechnical Journal 27, Nr. 4 (01.08.1990): 520–26. http://dx.doi.org/10.1139/t90-066.

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The shear deformation behaviour along soil–geotextile interfaces has been investigated and is compared with that of the respective soils. Six soils (two sands, two clays, and two peats) in combination with eight different geotextiles (woven and nonwoven) were tested at various conditions in direct shear. It was found that the stiffnesses during shearing for the sand-geotextile interfaces were less than those for the actual sand, by a factor that was largely independent of the normal stress level. The same behaviour was found for the clays and for one of the peats in contact with non-woven geotextiles. For woven geotextile interfaces in contact with the clays and the peats, the load deformation behaviour was generally stiffer than for the actual soils. Key words: geotextiles, differential shear, soil–geotextile interfaces, load transfer during shear.

Choudhary, Nikita. „Jute Geotextiles as Substitute to Synthetic Geotextiles“. Advanced Materials Research 821-822 (September 2013): 85–89. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.85.

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Jute based geotextile as a substitute to synthetic geotextiles has been reviewed in this study. The importance, advantage and disadvantage of Jute based geotextile have been highlighted. Geotextiles are permeable fabrics which, when used in association with soil, have the ability to separate, filter, reinforce, protect, or drain. The degrading condition of the environment and presence of non-biodegradable residues of geotexties as a pollutant has caught attention of scientific researchers. Ecological sustainability and environment has become one of the prime issues in the modern developmental strategy .Jute fibre has been found to be an alternate and potential geotextile material. Studies have shown that lifespan and engineering properties of jute based geotextiles can be suitably modified to suit its intended use.

Long, Xiaoyun, Lifen He, Yan Zhang und Mingqiao Ge. „Multicomponent Composite Emulsion Treated Geotextile on Landfill with Improved Long-Term Stability and Security“. Journal of Engineered Fibers and Fabrics 13, Nr. 3 (September 2018): 155892501801300. http://dx.doi.org/10.1177/155892501801300307.

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Polypropylene geotextiles were treated with multicomponent composite emulsion consist of polytetrafluoroethylene (PTFE), nona-silica and fluorous acrylate. After process of treatment, the treated geotextiles showed greater long-term stability and security than untreated geotextiles on the landfill slope. Firstly, the surface of fibers was investigated by scanning electron microscopy (SEM). Composite thin film was found on them, indicating the successful attachment of ternary composite agents on fibers through pad-drying method. Subsequently, the effect of weathering stability and metallic ions (cupric ions usually) resistance on mechanical properties of samples were studied by using tensile machine. The friction angle values of various interfaces and tension in geotextile versus slope angle were also studied via tilt table test. Our mechanics performance tests indicated that the weathering ability and cupric ions resistance of geotextile were greatly improved via treatment with the composite emulsion. The roughness of geotextile surface, the friction angles of all interfaces and tension in geotextile on landfill slope were decreased.

Lassabatère, L., T. Winiarski und R. Galvez-Cloutier. „Can geotextiles modify the transfer of heavy metals transported by stormwater in infiltration basins?“ Water Science and Technology 51, Nr. 2 (01.01.2005): 29–36. http://dx.doi.org/10.2166/wst.2005.0029.

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Geotextiles are fibrous materials increasingly employed for the design of infiltration basins. However, their influence on the transfer of contaminants carried by stormwater has not been fully investigated. This study, based on column leaching experiments, aims at showing the effect of geotextiles on the transfer of three heavy metals (Zn, Pb and Cd) in a reactive soil (simulating an infiltration basin at laboratory scale). This effect depends on several factors, such as type of geotextile, hydric conditions (geotextile water content), hydraulic conditions (flow-rates) and the number of geotextiles installed. In all cases, geotextiles influence heavy metal retention by modifying flow and thus regulating contact between these metals and the reactive soil.

Z Lubis, Mhd Khuzeir, und Kamaluddin Lubis. „Evaluasi Perbaikan Tanah Menggunakan Geotekstil Untuk Meningkatkan Stabilitas Tanah Lapisan Subgrade Pekerjaan Jalan“. JOURNAL OF CIVIL ENGINEERING, BUILDING AND TRANSPORTATION 3, Nr. 2 (10.09.2019): 71. http://dx.doi.org/10.31289/jcebt.v3i2.2702.

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<em>At the stage of a construction work one of the main problems in soft soil is the large land decline. The large decrease is due to the decrease in soil. The condition of poor base soil in the form of clay soil needs to be done to improve the basic soil to be able to support the construction load. One method used as land improvement is by geotextiles. The type of geotextile used in the construction of the Medan-Kualanamu-Tebing Tinggi toll road project, Parbarakan-Lubuk Pakam Sta.42 + 750-Sta.47 + 600 is a geotextile PP woven polypropylene. The geotextile type uses non woven geotextile while the study is geotextile polypropylene woven, Non woven tensile strength 20 kN / m required 1 layer of geotextile while tensile strength Polypropylene woven 30 kN / m required 2 layers of geotextile. From these calculations can be concluded that the use of geotextiles can be used as one of the repair and retrofitting.</em>

Hsing, Wen Hao, Ching Wen Lou, Ching Wen Lin, Jin Mao Chen und Jia Horng Lin. „Effects of the Content of High Strength Polyethylene Terephthalate Fiber and Kevlar Fiber on Properties of Geotextiles“. Applied Mechanics and Materials 365-366 (August 2013): 1082–85. http://dx.doi.org/10.4028/www.scientific.net/amm.365-366.1082.

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Geotextiles have been commonly used globally, making the control of material selection to influence geotextiles properties an important research topic. This study aims to explore the effects of the ratio of high-strength polyethylene terephthalate (HPET) fiber to Kevlar fiber on hybrid geotextiles. At the first stage, HPET and polyethylene terephthalate (PET) fiber are combined to make HPET/PET hybrid geotextile and then tested for porosity and water permeability, determining the optimum HPET/PET ratio. At the second stage, with a content of 60 % PET fibers, HPET fibers and Kevlar fibers are mixed with various ratios to form Kevlar/HPET/PET hybrid geotextiles. The experimental results show that with an increase in the content of HPET fibers, the porosity and water permeability of the Kevlar/HPET/PET hybrid geotextile decrease.

Newman, A. P., E. O. Nnadi, L. J. Duckers und A. J. Cobley. „Further developments in self-fertilising geotextiles for use in pervious pavements“. Water Science and Technology 64, Nr. 6 (01.09.2011): 1333–39. http://dx.doi.org/10.2166/wst.2011.180.

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Geotextiles incorporating inorganic nutrients (particularly phosphorous) to enhance the growth of oil degrading microoganisms when geotextiles are used in pervious pavement applications have been shown to be effective in the past. However the cost and manufacturing difficulties have been a barrier to their use. A polypropylene random mat geotextile incorporating an alternative polymer additive as a source of phosphorus has been investigated as a potential self-fertilising geotextile. Experiments are reported which investigate nutrient leach rates, biofilm formation and biodegradation activity.

Mehr Quellen

Dissertationen zum Thema "Geotextilien":

Heitz, Claas. „Bodengewölbe unter ruhender und nichtruhender Belastung bei Berücksichtigung von Bewehrungseinlagen aus Geogittern“. Kassel : Univ.-Bibliothek, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?idn=982740581.

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Fedorova, Katja. „Geosynteter för hållbara vägar : Modell för jämförelse av vägöverbyggnader med eller utan geotextiler och/eller geonät“. Thesis, Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-13408.

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The different material layers as part of a road construction fill all a function so theroad becomes durable, safe, comfortable and aesthetically pleasing. Recently, anew group of construction materials started to play an important role in roadconstruction – geosynthetics. This thesis addresses the two most common types ofgeosynthetics used in modern road construction, namely geogrids and geotextiles.The most common use of geogrids is reinforcement of poor subgrade by usinggeogrid soil reinforcement, which occurs when road material particles wedge inthe geogrid’s mesh. Geotextiles act partly as a barrier that prevents the finermaterial in the below ground from being mixed with coarser upper material andalso act as a load spreader.Road contractors often face a choice of whether geogrids and/or geotextiles areappropriate in a particular road project and also how much profit the choice mightbring. This phase in the tender calculation process is the intended scope of thisthesis. The thesis deals with both the "hard" cost-function aspects and the "softer" values e.g. ecology and social aspects. To facilitate the comparison, a comparative modelwas developed. The comparison is done for two different cases: Case A – roadconstruction on the bank and Case B – road construction in hill cutting. In Case A “with geogrid”, the amount of trenching becomes smaller due to saving ofreinforcement layer thickness.The completed cost comparison indicates an opportunity for significant savings forroad contractors that choose to strengthen the road’s superstructure with geogrid. In Case A “with geotextile”, no trenching saving is likely, but instead, bearingcapacity improvement is a long term financial gain. An estimated cost for Case B “hill cutting road”, is approximately SEK 600 000 which is less than the cheapestcase i.e. Case A “with geogrid”. After the use of geogrids, the function changes are as following: Traffic load distribution on the terrace has increased and lateral landmovements have reduced Filling material density has increased due to geogrid wedging mechanism Frictional resistance has increased due to the fact that pavement materialparticles have been extended due to geogrid’s wedging mechanism Superstructure’s total thickness has been reduced due reinforcement layerthickness’s reduction After the use of geogrids, the function changes are as following: The composition and function of the road pavement and terrace materialremains intact. (The words "remains intact" run true to the concept of"functional change" but in this case, it is meant that the materialcomposition and function could have been worse if not properly chosengeotextile was added to the design). The scenario "gritty mud" is avoided if the geotextile has been enteredcorrectly with the right overlap. Results concerning the ecological aspects show that the trenching reduction due touse of geogrids leads to fewer ground motion, lesser soil degradation and fewerenvironmental harmful emissions because the use of road construction equipmentdeclines. Reduced distribution excavation thanks to geotextiles leads to both thesame advantages as in the sentence above and partly to the fact that the amount ofmaterials that need become deposited decreases. In addition, the risk ofgroundwater lowering due to artificial drainage ditch is minimized. The road'stotal life cycle is extended, which contributes to reducing the environmentalimpacts arising from road repair and construction of a new road if the old onestops fulfilling its function. Degradation of geogrids and geotextiles is notenvironmentally harmful, but takes a long time in natural conditions, which meansthat in practice, the use must be documented and taken care of (regarding finalcombustion in a prudent manner).Regarding social sustainability, the following conclusion could be drawn: a roadthat has a higher carrying capacity leads to higher traffic safety due to minimalsubsidence, track formation and cracking. Road safety is seen by citizens not onlyas something that the private motorists are responsible for but also something thatroad authorities should consider when planning for a socially sustainable society.Another conclusion is road maintenance frequency and hereby the taxpayers' longtermeconomic gain. The road extended total life cycle contributes to the reductionof road repairs and new construction of roads. In other words, it is not just “oneroad construction company” that wins economically by minimizing their warrantywork. The discussion concerns the cases where geosynthetics are not economicallyoptimal bearing capacity choice, such as solid rock cutting or a stretch of roadwhich has weaker parties but for which, a filling material yet compensates for theexcavated. The report concludes with a special discussion of the Swedishgeosynthetics research. The geosynthetics industry is controlled by private actors(developers, manufacturers and others) and contractors who do not like releasinginformation that might reduce their competitiveness. Therefore, the independentresearcher’s role has been quite weak and mostly reduced to “play ‘catch-up’insofar as investigating the nuances of how geosynthetics work "(Koerner, 2005). Another reason for the lack of reports on geosynthetics benefit is the long term asa sharp research project takes to plan, implement, control and evaluate. WhilstTrafikverket’s and local municipalities’ play the leading role in the Swedish roadconstruction industries, it should be in their interest to start taking geosyntheticsmore seriously by implementing credible tests and full scale trials and publishpractically applicable documents based on objective tests of structures containing geosynthetics.

Retzlaff, Jan. „Verhalten von Geokunststoffbewehrungen unter zyklischer Beanspruchung“. Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola&quot, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:105-925295.

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Eines der Hauptanwendungsgebiete von Geokunststoffen ist der Verkehrswegebau. Hier haben sich neben Trenn- und Filterlagen Geokunststoffbewehrungen etabliert. Ihr Zugkraft-Dehnungsverhalten hat Einfluss auf die Nutzungsdauer des Fahrbahnaufbaus. Dort wo diese Geokunststoffe zyklischen Beanspruchungen durch den Verkehr ausgesetzt sind, ist grundsätzlich von einem Einfluss auf das Zugkraft-Dehnungsverhalten auszugehen. Somit ist es erforderlich, die zyklischen Einwirkungen bei der Ermittlung der Bemessungszugfestigkeit von Geokunststoffen für derartige Anwendungen zu berücksichtigen. Die Arbeit stellt dafür ein praktikables Verfahren vor. Auf der Basis polymertypischer Merkmale, die sich in den Zugkraft-Dehnungskurven widerspiegeln, wurde eine Kombination aus zyklischen Zugversuchen und chemischen Analysen untersucht, die es erlaubt, ohne die sehr aufwendig zu ermittelnden Wöhler- bzw. Smith-Diagramme Aussagen zum Verhalten der Geokunststoffe für die im Verkehrswesen relevanten Lastwechselzahlen zu machen.

Aydogmus, Taner. „Beitrag zum Interaktionsverhalten von Geokunststoff und Lockergestein“. Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola&quot, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:105-1162582.

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Für die Berechnung der Standsicherheit von Konstruktionen mit Geokunststoffen ist die Ermittlung des "Interaktionsverhaltens" in den Schichtgrenzen zwischen Geokunststoffen und Lockergesteinen unerlässlich. Das Verbundverhalten in der Grenzfläche ist sehr komplex. Es ist von einer Vielzahl von Faktoren abhängig, die im Rahmen dieser Arbeit experimentell, analytisch und numerisch untersucht werden. Als Ausgangspunkt für die experimentellen Untersuchungen wird vom Verfasser ein multifunktionales Geosynthetik-Boden-Interaktionsprüfgerät entwickelt und gebaut, mit dem alle zur Standsicherheit eines geokunststoffbewehrten Erdkörpers benötigten Verbundparameter ermittelt werden können. Aus den erarbeiteten Ergebnissen resultiert die Empfehlung einer Gerätekonfiguration zur Bestimmung der Verbundparameter unter mechanisch klar definierten Randbedingungen, und die Grundlagen für die zukünftige Nutzung geringtragfähiger bindiger Lockergesteine als vollwertige Füllböden in geokunststoffbewehrten Konstruktionen werden gelegt.

Karademir, Tanay. „Elevated temperature effects on interface shear behavior“. Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42764.

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Environmental conditions such as temperature inevitably impact the long term performance, strength and deformation characteristics of most materials in infrastructure applications. The mechanical and durability properties of geosynthetic materials are strongly temperature dependent. The interfaces between geotextiles and geomembranes as well as between granular materials such as sands and geomembranes in landfill applications are subject to temperature changes due to seasonal temperature variations as well as exothermic reactions occurring in the waste body. This can be a critical factor governing the stability of modern waste containment lining systems. Historically, most laboratory geosynthetic interface testing has been performed at room temperature. Information today is emerging that shows how temperatures in the liner systems of landfills can be much higher. An extensive research study was undertaken in an effort to investigate temperature effects on interface shear behavior between (a) NPNW polypropylene geotextiles and both smooth PVC as well as smooth and textured HDPE geomembranes and (b) sands of different angularity and smooth PVC and HDPE geomembranes. A temperature controlled chamber was designed and developed to simulate elevated temperature field conditions and shear displacement-failure mechanisms at these higher temperatures. The physical laboratory testing program consisted of multiple series of interface shear tests between material combinations found in landfill applications under a range of normal stress levels from 10 to 400 kPa and at a range of test temperatures from 20 to 50 °C. Complementary geotextile single filament tensile tests were performed at different temperatures using a dynamic thermo-mechanical analyzer (DMA) to evaluate tensile strength properties of geotextile single filaments at elevated temperatures. The single filament studies are important since the interface strength between geotextiles and geomembranes is controlled by the fabric global matrix properties as well as the micro-scale characteristics of the geotextile and how it interacts with the geomembrane macro-topography. The peak interface strength for sand-geomembrane as well as geotextile-geomembrane interfaces depends on the geomembrane properties such as hardness and micro texture. To this end, the surface hardness of smooth HDPE and PVC geomembrane samples was measured at different temperatures in the temperature controlled chamber to evaluate how temperature changes affect the interface shear behavior and strength of geomembranes in combination with granular materials and/or geotextiles. The focus of this portion of the experimental work was to examine: i) the change in geomembrane hardness with temperature; ii) develop empirical relationships to predict shear strength properties of sand - geomembrane interfaces as a function of temperature; and iii) compare the results of empirically predicted frictional shear strength properties with the results of direct measurements from the interface shear tests performed at different elevated temperatures.

November, Justin Sidney. „A study of soil to geotextile filtration behaviour in conjunction with Berea sand in South Africa“. Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86381.

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Thesis (MScEng)--Stellenbosch University, 2014.
ENGLISH ABSTRACT: Geotextiles perform a number of functions in various applications in civil engineering practise. It is often cost effective and more environmentally friendly versus conventional construction methods. One of the main functions of a geotextile is filtration whereby the geotextile is expected to hold back the soil particles and simultaneously has to allow sufficient water to pass through it. Soils are all different and can be problematic when it comes to designing geotextile filters. One such problematic soil is encountered in KwaZulu- Natal, situated along the east coast of South Africa. The Berea sand is problematic as it can highly variable in its engineering properties over a small area. Geotextiles are becoming more and more common practice in South Africa and little is known about the filtration performance of commercially available geotextiles in conjunction with Berea sand. Local guidelines that are available are out of date and do not provide enough information to assist design engineers in decision making. Many international guidelines are available and it is difficult to choose which one is best suited to Berea sands. This primary objective of this study is to investigate the filtration performance of four variants of commercially available geotextiles and three variants of Berea sand. The applicability of some of the international filter design criteria will also be assessed. The soil to geotextile compatibility testing was carried out as per ASTM D5101 (2006) - Standard Test Method for Measuring the Soil-Geotextile System Clogging Potential by the Gradient Ratio. In total 12 permutations were executed. The results showed that only 5 test permutations met the gradient ratio and permeability criteria. The test results also conclude that the permeability is just as important as the gradient ratio. Thick geotextiles should be considered when used as filters in Berea sands. The available international geotextile filter design criteria were assessed and all showed poor correlation between laboratory results and suggested criteria. Designing geotextile filters in conjunction with Berea reds is challenging and it is recommended that design engineers perform laboratory performance testing in conjunction with their designs.
AFRIKAANSE OPSOMMING: Geotekstiele verrig vir 'n aantal funksies in verskeie programme in die siviele ingenieurswese praktyk. Dit is dikwels meer koste-effektief en omgewingsvriendelik, teenoor konvensionele konstruksie metodes. Een van die belangrikste funksies van 'n geotekstiel is filtrasie, waardeur van die geotekstiel verwag word om van die grond terug te hou, en gelyktydig genoeg water daardeur te laat vloei. Grond verskil en dit kan problematies wees wanneer dit kom by die ontwerp van geotekstiel filters. Een so ‘n problematiese grond kom voor in KwaZulu-Natal, geleë langs die ooskus van Suid-Afrika. (Die) Berea sand is problematies, want dit verander geweldig baie ten opsigte van ingenieurseienskappe oor 'n redelike klein area. Gebruik van geotekstiele word al hoe meer ‘n algemene praktyk in Suid- Afrika, terwyl min bekend is oor die filtrasie prestasie van kommersieel beskikbare geotekstiele in samewerking met Berea sand. Plaaslike riglyne wat beskikbaar is, is verouderd en onvoldoende inligting is beskikbaar aan ontwerpingenieurs vir besluitneming . Baie internasionale riglyne is beskikbaar en dit is moeilik om te besluit watter een die beste van toepassing is vir Berea sand. Die doel van hierdie studie is om die filtrasie prestasie van vier modelle van kommersieël beskikbare geotekstiele en voorbeelde van drie soorte Berea sand te ondersoek. Die toepaslikheid van 'n paar van die internasionale filter ontwerp kriteria sal ook beoordeel word. Die toetsing van grondverenigbaarheid met geotekstiel is uitgevoer soos aangedui in ASTM D5101 (2006 ) – Standaard Toets Metode vir die meet van die grond-Geotekstiel verstopping potensiëel deur die gradient verhouding. In totaal is 12 permutasies uitgevoer. Die resultate het getoon dat slegs 5 toetspermutasies beide gradiënt verhouding en permeabiliteit kriteria bevredig het. Dikker geotekstiele word ook aanbeveel vir gebruik as filters in Berea sand. Van die toets resultate kan ook afgelei word dat die permeabiliteit net so belangrik soos die gradiënt verhouding is. Beskikbare internasionalegeotekstiel filter ontwerp kriteria is nagegaan en al die metodes het swak korrelasie tussen laboratorium resultate en die voorgestelde kriteria getoon. Om geotekstiel filters in samewerking met Berea Reds te ontwerp is 'n uitdaging en dit word aanbeveel dat ontwerpingenieurs laboratorium prestasietoetsing in samewerking met hul ontwerpe uitvoer.

Baret, Christophe Marc Eric. „The effect of structure slope and packing arrangement on the hydraulic stability of geotextile sand container revetments“. Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/79919.

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Thesis (MScEng)--Stellenbosch University, 2013.
ENGLISH ABSTRACT: Innovative and versatile coastal protection structures made of Geotextile Sand Containers (GSCs) are increasingly being incorporated into coastal management solutions because of their cost effective and environmentally friendly characteristics. This is as opposed to conventional ‘hard’ coastal protection solutions that utilise rocks and or concrete units to protect the coastline. With GSC structures being a relatively new coastal protection solution, few design and construction guidelines are available. Research into the behaviour of GSC structures under wave attack is on-going with particular emphasis on the hydraulic processes that affect GSC structures and cause them to fail. The use of GSC revetments as coastal protection solutions has become more popular in South Africa during recent times, particularly along the coastline of KwaZulu-Natal. However, the chosen design of these GSC revetments falls outside the range of applicability of the available design charts and stability equations. Therefore the hydraulic stability of these structures is largely unknown. The primary objective of this study is to investigate the effect of structure slopes and packing arrangements on the hydraulic stability of GSC revetments. The application of available design charts and stability equations was also evaluated. Two-dimensional physical modelling was undertaken and a total of 12 GSC revetment permutations were tested during the physical modelling test series. The results of the physical modelling showed that the structure slope had the most significant effect on the hydraulic stability. Steeper structure slopes were more hydraulically stable than gentler structure slopes. The packing arrangements of the GSCs had less of an effect on the hydraulic stability of the GSC revetments. Single layer GSC armour revetments matched or out-performed the equivalent double layer GSC revetments; while GSC revetments with GSCs orientated with the long axis perpendicular to the wave attack performed marginally better than the equivalent GSC revetments with GSCs orientated with the long axis parallel to the wave attack. The available design charts and stability equations were assessed against the results of the physical modelling and showed varying degrees of correlation. The stability equation proposed by Recio (2007) proved to be particularly accurate.
AFRIKAANSE OPSOMMING: Innoverende en veelsydige kusbeskermingstrukture wat van geotekstielsandhouers (GSH’s) gemaak is, word al hoe meer by kusbestuursoplossings ingesluit weens die kostedoeltreffendheid en omgewingsvriendelike aard daarvan. Dít is in teenstelling met konvensionele ‘harde’ kusbeskermingsoplossings, wat van rotse en/of betoneenhede gebruik maak om die kuslyn te beskerm. Aangesien GSH-strukture ’n betreklik nuwe kusbeskermingsoplossing is, is weinig ontwerp- en konstruksieriglyne beskikbaar. Navorsing oor die werkverrigting van GSH-strukture onder golfaanslag duur voort, met bepaalde klem op die hidrouliese prosesse wat GSH-strukture beïnvloed en die werking daarvan benadeel. Die gebruik van GSH-bedekte hellings as kusbeskermingsoplossings het in die laaste tyd al hoe gewilder geword in Suid-Afrika, veral langs die kus van KwaZulu-Natal. Tog val die gekose ontwerp van hierdie GSH-bedekte hellings buite die toepaslikheidsbestek van die beskikbare ontwerpriglyne en stabiliteitsvergelykings. Die hidrouliese stabiliteit van hierdie strukture is dus grotendeels onbekend. Die hoofoogmerk van hierdie studie was om ondersoek in te stel na die effek van struktuurhellings en pakformasies op die hidrouliese stabiliteit van GSH-bedekte hellings. Die toepaslikheid van beskikbare ontwerpriglyne en stabiliteitsvergelykings is ook geëvalueer. Tweedimensionele fisiese modellering is onderneem en altesaam 12 GSH-bedekte hellings is gedurende die fisiese-modelleringstoetsreeks getoets. Die resultate van die fisiese modellering toon dat die struktuurhelling die beduidendste effek op hidrouliese stabiliteit het. Steiler struktuurhellings was hidroulies meer stabiel as platter hellings. Die pakformasies van die GSH’s blyk ’n kleiner effek op die hidrouliese stabiliteit van die GSH-bedekte hellings te hê. GSH-bedekte hellings wat met ’n enkele laag GSH’s versterk is, het ewe goed of beter presteer as die keermure met ’n dubbele laag GSH’s, terwyl GSH-bedekte hellings met die lang-as van die GSH’s loodreg op die rigting van die golfaanslag effens beter presteer het as dié met die lang-as parallel met die golfaanslag. Die beskikbare ontwerpriglyne en stabiliteitsvergelykings is geëvalueer aan die hand van die resultate van die fisiese modellering, en het ’n wisselende mate van korrelasie getoon. Veral die stabiliteitsvergelyking van Recio (2007) blyk besonder akkuraat te wees.

El-Jack, Abdelmoneim M. A. „Structure-property relation of nonwoven geotextiles“. Thesis, University of Leeds, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414539.

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Hachouf, Kamel. „Geotextile soil reinforcement in retaining walls“. Thesis, Queen Mary, University of London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283366.

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Satyamurthy, Ranjan. „Experimental investigations of geotextile tube dewatering“. Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2008. http://wwwlib.umi.com/cr/syr/main.

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Mehr Quellen

Bücher zum Thema "Geotextilien":

Li, Guangxin. Geosynthetics in Civil and Environmental Engineering: Geosynthetics Asia 2008 Proceedings of the 4th Asian Regional Conference on Geosynthetics in Shanghai, China. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009.

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John, N. W. M. Geotextiles. Glasgow: Blackie, 1987.

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Richard, François. Geotextiles = géotextiles. [Ottawa]: Dept. of the Secretary of State of Canada, 1992.

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Ingold, T. S. Geotextiles handbook. London: T. Telford, 1988.

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American Society for Testing and Materials. ASTM standards on geotextiles. Philadelphia, PA: ASTM, 1988.

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Jewell, R. A. Soil reinforcement with geotextiles. London: CIRIA and Thomas Telford, 1996.

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Jewell, R. A. Soil reinforcement with geotextiles. London: Construction Industry Research and Information Association, 1996.

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Horrocks, A. Richard. The durability of geotextiles. Guimaraes: EUROTEX, 1992.

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Kennedy, R. A. Geotextile well screen design. Birmingham: University of Birmingham, 1987.

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Holtz, R. D. Performance of geotextile separators. Olympia, Wash: Washington State Dept. of Transportation, 1996.

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Buchteile zum Thema "Geotextilien":

Balz, K., E. Bauer und S. Wohnlich. „Funktion von Geotextilien in Kapillarsperren“. In Die Kapillarsperre, 119–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60109-5_7.

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Deutschmann, B., und H. Hollert. „Geotextilien in Seedeichen – Ökotoxikologische Aspekte“. In Wasser: Ökologie und Bewirtschaftung, 101–15. Wiesbaden: Springer Fachmedien Wiesbaden, 2020. http://dx.doi.org/10.1007/978-3-658-31507-8_6.

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Campino, Ignacio, und Hans-Peter Wruk. „Einsatz von Geotextilien bei der Verhinderung der Rekontamination Ausgetauschter Böden durch Regenwürmer“. In Altlastensanierung ’90, 1349–50. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4899-3806-0_278.

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Gooch, Jan W. „Geotextiles“. In Encyclopedic Dictionary of Polymers, 339. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5484.

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Eslamian, Saeid, Majedeh Sayahi, Kaveh Ostad-Ali-Askari, Sayedeh Zahra Hosseini-Teshnizi, Sayed Alireza Zareei und Niloofar Salemi. „Geotextiles“. In Encyclopedia of Earth Sciences Series, 409–11. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73568-9_140.

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Eslamian, Saeid, Majedeh Sayahi, Kaveh Ostad-Ali-Askari, Sayedeh Zahra Hosseini-Teshnizi, Sayed Alireza Zareei und Niloofar Salemi. „Geotextiles“. In Encyclopedia of Earth Sciences Series, 1–3. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-12127-7_140-1.

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Vernon, Siobhan, Susan Irwine, Joanna Patton und Neil Chapman. „Geotextiles“. In Landscape Architect's Pocket Book, 192–93. 3. Aufl. London: Routledge, 2021. http://dx.doi.org/10.4324/9781003119500-38.

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Sprague, C. J., und G. W. Davis. „Polyester Geotextiles“. In ACS Symposium Series, 304–19. Washington, DC: American Chemical Society, 1991. http://dx.doi.org/10.1021/bk-1991-0457.ch020.

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Sanyal, Tapobrata. „Introducing Geotextiles“. In Developments in Geotechnical Engineering, 1–6. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1932-6_1.

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Schellmann, Gerhard, Helmut Brückner, Mike P. Stewart, Shawn M. Boeser, Dieter H. Kelletat, James R. Houston, Ram K. Mohan et al. „Geotextile Applications“. In Encyclopedia of Coastal Science, 479–81. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3880-1_152.

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Konferenzberichte zum Thema "Geotextilien":

Bashir, Asad, Abigail R. Clarke-Sather, Tyler M. Poggogiale und Christopher L. Meehan. „Material Properties of Discarded Textiles for Manufacturing Feedstocks“. In ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-63645.

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Abstract Presently, many textiles are discarded, in a condition that would allow a significant percentage of them to be able to be completely reused or recycled. Recent consumption practices embodied by “fast fashion”, fast purchasing, and fast disposal of out of style clothing has increased the volume of discarded clothing, as the repurposing and/or recycling of discarded textile materials has not increased at a proportional rate. Consequently, discarded clothing may have nearly no wear and tear or extensive use before consumers choose to dispose of these textiles. Increasing the recovery of textiles from municipal solid waste streams involves understanding the material properties that discarded textiles possess. Measuring the material properties available from discarded textiles will allow for understanding whether these textiles can be reused. At the same time as disposal of textiles has increased, geotextile purchase and use has been increasing rapidly. In the current study, tensile strength (break force) and permittivity of discarded clothing samples made of cotton, polyester, and cotton-polyester blends were measured and compared with material properties that are commonly specified for geotextile applications. Average break force values measured for discarded cotton and polyester and average permittivity values measured for 50%/50% cotton-polyester blends and polyester are higher than what is commonly recommended for common geotextile applications. Polyester materials showed promise for drainage and erosion control applications that would be commonly serviced by geotextiles, as polyester samples yielded average break force and permittivity values are above typically recommended geotextile minimum values for these applications.

Lin, Chuang, und Xiong Zhang. „Comparisons of Geotextile-Water Characteristic Curves for Wicking and Non-Wicking Geotextiles“. In Geo-Congress 2020. Reston, VA: American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784482797.061.

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Liao, K., und S. K. Bhatia. „Dewatering of Natural Sediments Using Geotextile Tubes: Comparative Behaviors of Woven and Non-Woven Geotextiles“. In GeoShanghai International Conference 2006. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40864(196)34.

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Herlin, Bruno, und Kent von Maubeuge. „Geosynthetic Clay Liners (GCLs)“. In 2002 4th International Pipeline Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ipc2002-27012.

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Geosynthetic Clay Liner’s (GCLs) are an established sealing product in the geoenvironmental industry. They are used in landfill applications as caps and base liners, secondary containment for fuel storage facilities, as well as within various other containment structures such as dams, canals, rivers, and lakes. Rolled out like a carpet to provide a durable impermeable liner, Geosynthetic Clay Liners consist of a layer of high swelling sodium bentonite sandwiched between two geotextiles. Manufactured around the world in different techniques, the Canadian manufactured GCL, is mechanically bonded by needlepunching from one nonwoven geotextile through the bentonite to the other nonwoven or woven geotextile. The low hydraulic conductivity of the GCLs are used mainly as a replacement to thick, difficult to build compacted clay liners to provide a barrier to liquids and gases, offering both a technical and economical advantage. GCLs, with an average thickness of 7mm, offer a volume advantage over Compacted Clay Liners. They are more capable of withstanding freeze-thaw and wet-dry cycles; offer substantial construction cost savings in reduced on-site QC/QA and a quicker installation. Furthermore, GCLs offer equivalent or lower rates of release of fluids and chemicals than Compacted Clay Liners (CCLs). Bentonite is a clay mineral with expansive characteristics and low permeability, where montmorillonite is the chief mineral. Montmorillonite, swells when contacted with water approximately 900% by volume or 700% by weight. When hydrated under confinement, the bentonite swells to form a low permeability clay liner, the equivalent hydraulic protection of several feet of compacted clay. A relatively new engineering material for some, geosynthetic clay liners have been used extensively over the past two decades, and are finding increasing use in every sector of the environmental industry. This paper will review the technical properties of these materials, their documentation at the research level, their integrity as a sealing barrier and recent field applications in the pipeline industry. Further, because these materials are factory produced, their properties are predictable, assisting the engineer to design with a high confidence level. Technical properties and economical benefits are sure to further increase GCL installations around the world to protect our environment and more importantly our groundwater.

Karimian, Hamid, Dharma Wijewickreme und Doug Honegger. „Full-Scale Laboratory Testing to Assess Methods for Reduction of Soil Loads on Buried Pipes Subject to Transverse Ground Movement“. In 2006 International Pipeline Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ipc2006-10047.

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A series of full-scale tests were undertaken to examine the effectiveness of the use of geosynthetic materials to reduce lateral soil loads on buried pipelines subjected to transverse ground movements. The testing program consisted of measuring lateral soil loads on steel pipes buried in trenches simulating different native soil and backfill material configurations. The effectiveness of lining the inclined surface of the trench (i.e. “trench slope”) with two layers of geotextile as a method of soil load reduction depends on the formation of good slippage at the geotextile interface. Pipes buried in relatively soft native soil can penetrate into the native soil during lateral displacement, thus causing the geotextile-lining to be ineffective as a reducer of lateral soil loads. Although there is more opportunity for slippage at the geotextile interface when the trench is in relatively stiff soil, the soil loads on the pipe seem to still increase when the pipe moves in close proximity to the trench slope; this effect is likely due to the increased normal pressures on the pipe arising as a result of the presence of the stiff trench in the vicinity of the pipe.

Alexiew, Dimiter, Daniel Brokemper und Steve Lothspeich. „Geotextile Encased Columns (GEC): Load Capacity, Geotextile Selection and Pre-Design Graphs“. In Geo-Frontiers Congress 2005. Reston, VA: American Society of Civil Engineers, 2005. http://dx.doi.org/10.1061/40777(156)12.

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Gru¨ne, Joachim, Uwe Sparboom, Reinold Schmidt-Koppenhagen, Zeya Wang und Hocine Oumeraci. „Large-Scale Investigations of Geotextile Sandcontainers Used for Scour Protection of Offshore Monopiles Supporting Wind Energy Turbines“. In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92627.

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An innovative scour protection for monopile structures was proposed by using geotextile sand containers in a research programme started recently. Large-scale model tests on the stability of such alternative scour protection are being performed in the Large Wave Channel (GWK) of the Coastal Research Centre (FZK). First results are reported from basic test series performed with single geotextile sand containers and container groups with different container weights, varied in sizes and percentages of filling. Further an empirical approach on the stability of sand containers is estimated as a first approximation from the results.

Stormont, John C., und Carl E. Morris. „Characterization of Unsaturated Nonwoven Geotextiles“. In Geo-Denver 2000. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40510(287)10.

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Heibaum, M. „Surface erosion countermeasures incorporating geotextiles“. In The 8th International Conference on Scour and Erosion. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315375045-77.

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Kim, D., und J. D. Frost. „Characterization of Geotextile Void Structure“. In Geo-Denver 2007. Reston, VA: American Society of Civil Engineers, 2007. http://dx.doi.org/10.1061/40909(228)1.

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Berichte der Organisationen zum Thema "Geotextilien":

Qamhia, Issam, und Erol Tutumluer. Evaluation of Geosynthetics Use in Pavement Foundation Layers and Their Effects on Design Methods. Illinois Center for Transportation, August 2021. http://dx.doi.org/10.36501/0197-9191/21-025.

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This report presents findings of a research effort aimed at reviewing and updating existing Illinois Department of Transportation (IDOT) specifications and manuals regarding the use of geosynthetic materials in pavements. The project consisted of three tasks: evaluate current IDOT practice related to the use of geosynthetics; review research and state of the practice on geosynthetics applications, available products, design methods, and specifications; and propose recommendations for geosynthetic solutions in pavements to modernize IDOT’s practices and manuals. The review of IDOT specifications revealed that geotextiles are the most used geosynthetic product in Illinois, followed by geogrids. Several of IDOT’s manuals have comprehensive guidelines to properly design and construct pavements with geosynthetics, but several knowledge gaps and potential areas for modernization and adoption of new specifications still exist. Based on the review of the available design methods and the most relevant geosynthetic properties and characterization methods linked to field performance, several updates to IDOT’s practice were proposed. Areas of improvement are listed as follows. First, establish proper mechanisms for using geogrids, geocells, and geotextiles in subgrade restraint and base stabilization applications. This includes using shear wave transducers, i.e., bender elements, to quantify local stiffness enhancements and adopting the Giroud and Han design method for subgrade restraint applications. Second, update IDOT’s Subgrade Stability Manual to include property requirements for geogrids, geotextiles, and geocells suitable for subgrade restraint applications. Third, establish proper standards on stabilization, separation, and pumping resistance for geotextiles by incorporating recent research findings on geotextile clogging and permeability criteria. Fourth, promote the use of modern geosynthetic products, such as geotextiles with enhanced lateral drainage, and fifth, elaborate on proper methods for construction/quality control measures for pavements with geosynthetics.

Ahlrich, Randy C. User's Guide: Asphalt Rubber and Geotextile Interlayers. Fort Belvoir, VA: Defense Technical Information Center, August 1992. http://dx.doi.org/10.21236/ada264781.

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Karcz, Dean, und R. Holtz. Development of an IDOH Classification System for Geotextiles. West Lafayette, IN: Purdue University, 1988. http://dx.doi.org/10.5703/1288284314153.

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Kane, William, J. L. Klosky, Joram Shenhar, Will Shulman und Stephen Solga. Feasibility Study of the Geotextile Waste Filtration Unit. Fort Belvoir, VA: Defense Technical Information Center, Februar 2000. http://dx.doi.org/10.21236/ada373530.

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Shoenberger, James E. User's Guide: Geotextiles as Separation Layers in Pavement Structures. Fort Belvoir, VA: Defense Technical Information Center, Juni 1992. http://dx.doi.org/10.21236/ada264650.

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Konoplyanaya, A. E., und N. A. Gruzintseva. The program for the formation of a complete plan for technological control of the production of geotextile materials. OFERNIO, März 2021. http://dx.doi.org/10.12731/ofernio.2021.24771.

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Behnood, Ali, und Jan Olek. Development of Subgrade Stabilization and Slab Undersealing Solutions for PCC Pavements Restoration and Repairs. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317128.

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The loss of functionality and the development of distress in concrete pavements is often attributable to the poor subbase and subgrade conditions and/or loss of support due to the development of the voids underneath the slab. Subgrade soil stabilization can be used as an effective approach to restore the functionality of the subgrades in patching projects. This research had two main objectives: (1) identifying the best practices for soil stabilization of the existing subgrade during pavement patching operations and (2) identifying and developing new, modified grouting materials for slab stabilization and undersealing. Various stabilization scenarios were tested and showed improved performance of the subgrade layer. The use of geotextile along with aggregate course was found to significantly reduce the settlement. Non-removable flowable fill was also found to significantly reduce the subgrade settlement. Cement-treated aggregate and lean concrete provided the best performance, as they prevented formation of any noticeable settlement in the underlying subgrade.

Thembeka Ncube, Ayanda, und Antonio Bobet. Use of Recycled Asphalt. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317316.

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The term Reclaimed Asphalt Pavement (RAP) is used to designate a material obtained from the removal of pavement materials. RAP is used across the US in multiple applications, largely on asphalt pavement layers. RAP can be described as a uniform granular non-plastic material, with a very low percentage of fines. It is formed by aggregate coated with a thin layer of asphalt. It is often used mixed with other granular materials. The addition of RAP to aggregates decreases the maximum dry unit weight of the mixture and decreases the optimum water content. It also increases the Resilient Modulus of the blend but decreases permeability. RAP can be used safely, as it does not pose any environmental concerns. The most important disadvantage of RAP is that it displays significant creep. It seems that this is caused by the presence of the asphaltic layer coating the aggregate. Creep increases with pressure and with temperature and decreases with the degree of compaction. Creep can be mitigated by either blending RAP with aggregate or by stabilization with chemical compounds. Fly ash and cement have shown to decrease, albeit not eliminate, the amount of creep. Mechanical stabilizing agents such as geotextiles may also be used.

Bhattarai, Rabin, Yufan Zhang und Jacob Wood. Evaluation of Various Perimeter Barrier Products. Illinois Center for Transportation, Mai 2021. http://dx.doi.org/10.36501/0197-9191/21-009.

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Construction activities entail substantial disturbance of topsoil and vegetative cover. As a result, stormwater runoff and erosion rates are increased significantly. If the soil erosion and subsequently generated sediment are not contained within the site, they would have a negative off-site impact as well as a detrimental influence on the receiving water body. In this study, replicable large-scale tests were used to analyze the ability of products to prevent sediment from exiting the perimeter of a site via sheet flow. The goal of these tests was to compare products to examine how well they retain sediment and how much ponding occurs upstream, as well as other criteria of interest to the Illinois Department of Transportation. The products analyzed were silt fence, woven monofilament geotextile, Filtrexx Siltsoxx, ERTEC ProWattle, triangular silt dike, sediment log, coconut coir log, Siltworm, GeoRidge, straw wattles, and Terra-Tube. Joint tests and vegetated buffer strip tests were also conducted. The duration of each test was 30 minutes, and 116 pounds of clay-loam soil were mixed with water in a 300 gallon tank. The solution was continuously mixed throughout the test. The sediment-water slurry was uniformly discharged over an 8 ft by 20 ft impervious 3:1 slope. The bottom of the slope had a permeable zone (8 ft by 8 ft) constructed from the same soil used in the mixing. The product was installed near the center of this zone. Water samples were collected at 5 minute intervals upstream and downstream of the product. These samples were analyzed for total sediment concentration to determine the effectiveness of each product. The performance of each product was evaluated in terms of sediment removal, ponding, ease of installation, and sustainability.

Qamhia, Issam, und Erol Tutumluer. Review of Improved Subgrade and Stabilized Subbases to Evaluate Performance of Concrete Pavements. Illinois Center for Transportation, Mai 2021. http://dx.doi.org/10.36501/0197-9191/21-016.

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This report presents findings on the evaluation of foundation layers under concrete pavements in the state of Illinois. It also provides recommendations and scenarios where unbound granular layers can be safely used under concrete pavements as economical and well-performing subbase layers. The current practice and mechanistic design methods for constructing concrete pavements in Illinois was first evaluated, including historical studies that led to the current design procedures and policies. The performance of concrete pavements with unbound granular layers in Illinois were then evaluated, and several case studies of well-performing concrete pavements with granular subbases, high traffic levels, and low distress levels and severity were realized. Next, the practices of surrounding states were evaluated, and several Midwest states, i.e., Wisconsin, Minnesota, Iowa, and Michigan, were found to regularly use unbound granular layers under concrete pavements with no issues. A literature review on the most recent requirements and recommendations for designing granular subbases under concrete pavements was then presented. It is concluded that subbase layers under concrete pavements are mainly used to provide uniform support and prevent pumping. Based on the case study evaluations and literature, a stable, drainable, and durable daylighted granular subbase design is recommended for traffic factors up to 10.0. Stability is ensured by limiting the ratio of gravel-to-sand fractions in the aggregate mix between 1.3 and 1.9. Drainability requirements can be met by limiting the percentage of fines passing the No. 200 sieve (0.075 mm) to 4% and by checking the quality of drainage is at least fair based on the time required to drain 50% of the water. Lastly, a geotextile fabric is recommended for use below the granular subbase for separation to ensure drainability throughout design life.