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(civil engineering)
Any synthetic material used in geotechnical engineering, such as geotextiles and geomembranes.


Any synthetic material used in geotechnical engineering.

Geotextiles are used with foundations, soils, rock, earth, or other geotechnical material as an integral part of a manufactured project, structure, or system. These textile products are made of synthetic fibers or yarns and constructed into woven or nonwoven fabrics that weigh from 3 to 30 oz/yd2 (100 to 1000 g/m2). Geotextiles are more commonly known by other names, for example, filter fabrics, civil engineering fabrics, support membranes, and erosion control cloth.

Permeable geotextiles perform three basic functions in earth structures: separation, reinforcement, and filtration. Such geotextiles can thus be adapted to numerous applications in earthwork construction. The major end-use categories are stabilization (for roads, parking lots, embankments, and other structures built over soft ground); drainage (of subgrades, foundations, embankments, dams, or any earth structure requiring seepage control); erosion control (for shoreline, riverbanks, steep embankments, or other earth slopes to protect against the erosive force of moving water); and sedimentation control (for containment of sediment runoff from unvegetated earth slopes).

A geomembrane is any impermeable membrane used with soils, rock, earth, or other geotechnical material in order to block the migration of fluids. These membranes are usually made of synthetic polymers in sheets ranging from 0.01 to 0.14 in. (0.25 to 3.5 mm) thick. Geomembranes are also known as flexible membrane liners, synthetic liners, liners, or polymeric membranes.

Early liners included clay, bentonite, cement-stabilized sand, and asphalt. Modern geomembranes are commonly made of medium-density polyethylenes that are very nearly high-density polyethylenes (HDPE), several types of polyvinyl chloride (PVC), chlorosulfonated polyethylene (a synthetic rubber), ethylene propylene diene monomer (EPDM), and several other materials. Some geomembranes require reinforcement with an internal fabric scrim for added strength, or plasticization with low- molecular-weight additives for greater flexibility.

Geomembranes are able to contain fluids, thus preventing migration of contaminants or valuable fluid constituents. Since they prevent the dispersal of materials into surrounding regions, geomembranes are often used in conjunction with soil liners, permeable geotextiles, fluid drainage media, and other geotechnical support materials. The major application of geomembranes has been containment of hazardous wastes and prevention of pollution in landfill and surface impoundment construction. They are also used to a large extent in mining to contain chemical leaching solutions and the precious metals leached out of ore, in aquaculture ponds for improved health of aquatic life and improved harvesting procedures, in decorative pond construction, in water and chemical storage-tank repair and spill containment, in agriculture operations, in canal construction and repair, and in construction of floating covers for odor control, evaporation control, or wastewater treatment through anaerobic digestion. See Hazardous waste

References in periodicals archive ?
Geosynthetics Market by Type (Geotextiles, Geomembranes, Geogrids, Geofoams, Geonets and Other) & Applications (Road Industry, Railroad Stabilization, Water Management, Waste Management, Mining, Soil Reinforcement, Erosion Control), and by Region - Trends & Forecasts to 2019 http://www.
About 40 kilometres of new roads in Bani Yas suburb, Khalifa City, Mohammad Bin Zayed City and Khalifa Industrial Zone already use these geogrids, and about 30 per cent of all future projects will include them," he told Gulf News.
Tenders are invited for S And S Of Active Soil Stabilisation System With All Accessories Geotextile 280 Gsm Geogrids Of Tult 70 Kn Mtr Nails 12 Mm Dia Threaded Anchor Nails With Galvanised Coating 32 Mm Dia Drainage System With 160 Mm Dia Perforated Pvc Pipe For Provision
Polymeric geogrid materials, including punched and drawn polypropylene (PP) geogrids, are used routinely for soil reinforcement.
Depending on the product type the market is segmented into five types namely Geotextiles, Geomembranes, Geogrids, Geofoams and Geonets.
Standard test method for determining tensile properties of geogrids by single or multi-ribtensile method.
The report, published by Transparency Market Research and titled, "Geotextiles and Geogrids Market in UAE and GCC," says the GCC geotextile market, excluding UAE, was valued at $101.
Alyaf also offers a unique range of geocomposites, geogrids, geosynthetic clay liners (GCLs) and woven geotextiles.
Use of DEM to model the interlocking effect of geogrids under static and cyclic loading, in Konietzky, H.
The geogrids for reinforcement were planned to be installed in both the slopes of 1:2 and 1:3 inclination.
Geogrids are among the geosynthetics expected to benefit from improved spending on transportation infrastructure.