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Geocomposite drainage systems consist of a polymer drainage core protected by a geotextile acting as both a filter and a separator to the adjacent material. Thus a geonet, with a geotextile attached to one surface or to both surfaces are indeed a drainage geocomposite. The geotextile filter is always attached to the drainage core and the core can take a wide variety of nongeonet shapes and configurations. In some cases, the geotextile is only on one side of the core, in other cases it is wrapped completely around the drainage core.
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Geogrids are high-strength, soil reinforcement products composed of polypropylene, polyethylene, polyester, or PVC-coated polyester. All geogrids have an open mesh configuration with apertures ranging from ½ to 3 inches. These are formed by several different methods. The polyester and polyester PVC-coated geogrids are typically woven or knitted. The polypropylene geogrids are either extruded or punched sheet drawn, and polyethylene geogrids are exclusively punched sheet drawn. These are most commonly used to steepen or stabilize a slope, construct a soil wall, or to increase the bearing capacity of weak subgrades under embankments.
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Geomembrane Systems are very low-permeable synthetic liners used to control fluid or gas migration within soil, rock, earth or any other geotechnical material, as an integral part of a man-made product, structure or system. They are used in a variety of containment applications. The flexible membrane liners in the form of prefabricated plastic or elastomeric sheet materials are applied in the construction industry and civil engineering material with other geosynthetics. They are also used for the distribution, storage and containment of potable or agricultural water supplies. The rise of geomembranes for cover systems is used to cover solid waste sites, liquid waste ponds and potable water reservoirs, methane gas collection and hazardous waste containment.
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A geophysical exploration system utilizes a single conductor cable connected to a current source. This cable contains a number of earth probes coupled to it at spaced points with addressable switching units. In order to the probes inject current into the earth, the switching units are activated in sequence. At locations spaced from the probes the resistivity is measured and recorded for each injection. Resistivity measurements are compared with anomaly models to find a match of patterns, indicating the presence, size, and location of an anomaly.
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Geophysical survey is a systematic collection of geophysical data for spatial studies. Geophysical survey may use a great variety of sensing instruments, and data may be collected from above or below the earth's surface or from aerial or marine platforms. It has many applications in exploration geology, archaeology, and engineering.
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