The principle that geotextile construction should follow

The test should be carried out using a standard soil sample direct shear. When testing the standard sand, the upper and lower shear boxes are locked with a pin with a gap of 0.5 mm, and the prepared soil sample is filled into the upper and lower shear boxes to a depth of 50 mm. The geotextiles are laminated and compacted, 50 kPa normal force is applied, the pins are removed, and the horizontal loading is performed so that the upper and lower shear boxes are relatively displaced by 50 mm at a rate of (1.0±0.02) mm/min, and the shear-shear displacement relationship curve is recorded. And find its maximum shear stress.

The instrument was dismantled and the sand was poured out. The maximum shear stress at normal pressures of 100, 150 and 200 kPa was measured by the same method. When testing the soil, the upper and lower shear boxes should be kept at a distance: the coarse-grained soil is half of the soil sample d85, and the fine-grained soil is 1 mm. The soil density, compaction, compaction, compact density after compaction and compaction The solidification, normal pressure, and shear rate were the same as those of the geotextile field direct shear test.

Geotextiles are divided into short geotextiles and filament geotextiles. Short-staple geotextiles are a type of nonwoven and industrial fabric. Polyester crimped short fibers with a fiber fineness of 6-12 denier and a length of 54-64 mm are used as raw materials. The filament geotextile is a polyester filament needle-punched non-woven geotextile, which does not contain chemical additives, and the bentonite waterproof blanket is not heat-treated, and is an environmentally-friendly building material.

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