A composite covering system and its construction method suitable for slope polluted sites

Abstract

The invention discloses a method for controlling surface clay erosion of a slope by adopting an improved CCL / GM covering layer system; firstly, adding a certain amount of PAM and attapulgite to the original CCL layer to form a double-modified water-retaining agent , followed by adding fibers to the surface of the CCL layer, and finally placing the insulation layer above the geomembrane; the present invention improves the CCL by adding a water-retaining agent, which can effectively prevent the loss of water in the soil layer and avoid the conversion of water in the soil from liquid to gaseous state. Migrate to the folds of the geomembrane to condense and liquefy to erode the surface clay; by adding fibers on the surface of the CCL layer, it can effectively prevent the surface soil of the slope from slipping; arranging an insulation layer on the surface of the GM can effectively isolate the influence of ground temperature on the soil and prevent soil Body water evaporates.

Description

technical field [0001] The invention relates to a method for preventing surface clay from being eroded by downhill movement of condensed water in a CCL layer in a covering layer system under the action of an external temperature gradient, and belongs to the field of environmental geotechnical engineering. Background technique [0002] my country produces more than 50 million tons of hazardous waste every year, including 400 million tons of domestic garbage and more than 3 billion tons of industrial solid waste. According to the "China Urban Construction Statistical Yearbook" issued by the Ministry of Housing and Urban-Rural Development in a dominant position. In actual engineering practice, CCL and high-density polyethylene geomembrane are often used to form a composite liner system to reduce pollutant leakage. However, in many parts of the world, the composite liner system is often exposed to the air for several months to several years to cause large-scale shrinkage. Studie...

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Problems solved by technology

[0003] Technical problem: This invention aims to propose a solution to the common engineering problem that the water in the CCL / GM composite covering layer is vaporized and condensed to the folds under the geomembrane under the action of the temperature difference between day and night, and the surface clay is eroded down the slope. On the one hand, this technology should be able to solve the problem of water vaporization in CCL under the action of the external temperature field; Erosion problems under transport

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