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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 ?
Tenders are invited for Supply And Stacking Of Epoxy Coated 25 Mm Dia Anchor Rods Steel Wire Grid Mesh Geocomposite Synthetic Erosion Control Mat Machine Made Gabion And Rhomboidal Shaped Mesh Panels With All Accessories Bet Km 131 To Km 161 On Pt Road Proj Dantak
This edition integrates updates to Standard 12 on the hydraulics of different types of drains, including drain pipes, aggregate drains, geotextile drains, and geonets and geocomposite drains.
GSE is a global geosynthetics manufacturer that offers the widest selection and highest quality of LLDPE and HDPE geomembrane, geosynthetic clay liner, geonet, geocomposite, non-woven geotextile and concrete protection products.
The geocomposite includes a core element with ribs that are resistant to creep and compression forming the flow channels.
Gains for these and other smaller volume products will be driven by the ongoing development of new applications as well as increasing demand for prefabricated geocomposite products.
A type of geocomposite widely used for roofing in Europe, DELTA-DRAIN 6000 is now being manufactured in North America by Cosella-Dorken Products Inc.
methods using geotextile, geogrid and geocomposite for separation, drainage, or reinforcement under both unpaved and paved roads.
These proceedings of the April 2006 conference include over 215 papers documenting theoretical and methodological advances in working with natural soils (expansive and non-expansive), chemically stabilized soil, geosynthetics, geocomposite soils, and bentonite products.
Although geogrids and woven geotextiles decrease the settlement of recycled ballast considerably, the geocomposite (geogrid bonded with non-woven geotextiles) stabilizes recycled ballast remarkably well.
government officials, including those in the EPA, and Ohio State, the top university involved in the research of coal ash, to develop the new system, which consists of GSE's Bentoliner Coal Ash Resistant Geosynthetic Clay Liner, Leak Location Liner and CoalDrain Geocomposite.
The Proposed Work Consists Of Providing All On-Call Repair, Replacement, Maintenance, And Engineering Support For Construction Services To Include All Labor, Materials, Equipment, And Incidentals For Landfill Gas Collection, Control, And Compression Systems And For Repair Of Geosynthetic And Geocomposite Cap Materials (repairs On Closed Landfills)
The work includes: furnishing all operations required for the construction of the Class I landfill bottom liner system including: Erosion and sedimentation control, Excavation and backfill, Environmental cut-off wall, Dewatering and recharge, Groundwater wells, piezometers, and gas monitoring probes, Geosynthetic clay liner (GCL), Geomembrane (primary and secondary), Geocomposite (primary and secondary), Leachate collection trenches including gravel, pipe, geonet and geotextile, Drainage soil cover, Protective soil cover, Leachate removal system including piping and pumping system, Leachate pumps and electrical system, Leachate force main, Geosynthetic rain tarp, Stormwater structures, and Sodding.