Geosynthetic materials for flood control materials
Such SPE.Shows that a large number of engineering practice, geomembrane impervious good, general permeability coefficient K =10cm/s ~ 10cm/s; has great flexibility and adaptability to deformation ability; have good aging ability, under water, water is more durable. According to the anti aging test, it can be concluded that the service life of the polymer geomembrane buried in soil and water can be up to 50 years, and the service life of the high-density geomembrane in the dam is more than 100 years. Mainly made of geogrid, geogrid, belt, soil gabion, geotextile tube, geotextile bag, Geomat, EPS, geocell and so on, it is used for soil reinforcement and reinforcement. Such as the reinforcement of soft soil foundation, steep slope, retaining structure built in the stable foundation, embankment collapse rescue.
Geosynthetics can be divided into geotextile, geomembrane and geotextile composite materials, special geotechnical materials 4 categories: fabric is a kind of porous material, with polypropylene, polyester and nylon and other synthetic fiber materials, according to the production method can be divided into shape, fabric two other non woven. The fabric style is to use a series of single chain according to a certain way woven, generally by the orthogonal warp and weft two group fiber woven fabric; non plastic geotextile is made of short fiber and long fiber directional or random order, by acupuncture or thermal bonding, chemical bonding, the biggest characteristic the strength is no obvious direction, so its use is wide.The aging rate of geotextiles is closely related to the intensity, temperature, humidity, the type and color of the raw materials, the structure of the fabric and the environmental conditions.
The aging rate of geotextile exposed to sunlight is very fast, which can only be used for 1 years at most. However, the aging speed will be much slower when buried in soil or under water. At present, the aging speed of polypropylene fabric is very fast, the aging rate of polyester and polyethylene fabric is slow, and the difference is nearly L times. For the same kind of geosynthetics, light aging fast, slow aging aging dark, flat, thin, round wire, thick slow aging. Geomembrane is generally divided into two categories of asphalt and polymer. Each of the two classes has no reinforcement and reinforcement. The most commonly used polymer geomembrane is PVC, CPE, CB, HDPE, CSPE, etc..
