Shallow layer water control covering system of suction expansive soil slope based on capillary retardation mechanism

Abstract

The invention discloses a suction-type expansive soil slope shallow layer water-control covering system based on capillary retardation mechanism. Fine-grained layer, with drainage ditches at the foot of the slope. The suction layer includes the central retardation layer and the silt belt. A layer of geotextile is respectively laid on the contact surfaces of the silt belt and the central retardation layer, the silt belt and the coarse-grained layer, and the central retardation layer and the fine-grained layer. Based on the principle of capillary blockage, the present invention adopts the methods of blockage, drainage, and absorption to dredge the infiltrated precipitation during precipitation, which can effectively keep the water content of the expansive soil slope stable and reduce the impact of precipitation infiltration on slope stability. It can enhance the overall stability of the slope and reduce the impact of the dry-wet cycle on the expansive soil slope, and has the characteristics of convenient material acquisition, good durability, and low cost.

Description

Technical field [0001] The present invention relates to one kind of guide mechanism is based on arrest of capillary suction expansive soil Shallow water control covering system belonging to geotechnical engineering and geological engineering. Background technique [0002] Swelling clay is a montmorillonite clay and contains a lot of specific strongly hydrophilic illite minerals, widely distributed in my country, having water swelling, dehydration shrinkage, cohesion and shear strength fluctuation characteristics. Stability of the expansive soil slope sizing by its main effects, expansive soil moisture environment susceptible, prone to repeated expansion and contraction deformation, immersion carrying capacity attenuation, like the case of shrinkage fissures. So rainfall infiltration is a major cause of expansive soil slope instability. In the wet season, expansive soil slope after rainfall infiltration, soil slope being soaked to soften, shear strength decreases. Also expands due...

AI Technical Summary

Problems solved by technology

[0005] 1. The use of geomembrane for support cannot meet the long-term use, and the slope is prone to landslides at the interface of the geomembrane

[0006] 2. The existing flexible ecological slope needs to provide water for the vegetation layer due to the slope soil. When the vegetation transpiration is strong, the slope soil cannot meet the growth needs of vegetation and has a great impact on the water content of the slope soil.

[0007] 3. The existing rigid support method has complex construction, high cost, lack of plant coverage, and unattractive appearance

[0009] 1. The cover layer currently used in landfills does not collect the rainwater that breaks through the cover layer, and the rainwater that breaks through the capillary block tends to gather at the foot of the slope. For expansive soil slopes, infiltrated rainwater will cause expansive soil slopes break at the foot of the slope

[0010] 2. The traditional capillary retardation overlay cannot make full use of the water storage capacity of the silt layer

[0011] 3. The thickness of the traditional capillary retardation covering layer is too large and cannot be applied to the support of expansive soil slopes

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