HDPE geomembrane and bentonite-clay composite vertical anti-seepage wall and mounting construction method thereof

Abstract

The invention relates to an HDPE geomembrane and bentonite-clay composite vertical anti-seepage wall and a mounting construction method thereof. The HDPE geomembrane and bentonite-clay composite vertical anti-seepage wall is arranged on underground opposite water-resisting layers, and composed of an HDPE geomembrane and a bentonite-clay anti-seepage layer. The mounting construction method comprises the steps that a polluted area and a pollution control field area are subjected to engineering geology and hydrogeology survey; a site is leveled; the HDPE geomembrane is vertically inserted and laid; bentonite-clay slurry is intermittently replenished; and a trapezoidal dam integrally connected with a guide wall and a guide wall platform is formed. Through the technical scheme, the HDPE geomembrane and bentonite-clay composite vertical anti-seepage wall and the mounting construction method thereof have the advantages that mounting is easy, the cost is low, the anti-seepage layer structure is not damaged, and pollution is disposed in situ; and local materials can be used in the construction process, on the basis of meeting original anti-seepage requirements, the safety and stability of ageomembrane anti-seepage layer can be improved, and damage, caused by external environmental disturbance or the bottom jacking effect, to the geomembrane is avoided.

Description

technical field [0001] The invention relates to an underground anti-seepage technology, in particular to an HDPE geomembrane-bentonite composite vertical anti-seepage wall and an installation and construction method thereof. Background technique [0002] In petrochemical plants, automobile gas stations, domestic waste landfills, industrial solid waste landfills, hazardous waste landfills and other places, there are hidden dangers of surface leakage or leakage problems have occurred, which seriously pollutes the surrounding groundwater and Soil affects people's living environment and life safety. [0003] With the enhancement of environmental protection awareness and stricter environmental protection regulations, people have more and more researches on underground anti-seepage, especially in polluted sites. Many industrial plants, automobile gas stations, and industrial solid waste Stockyards, tailings ponds and domestic waste landfills, these old factory areas and landfills...

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Problems solved by technology

[0002] In petrochemical plants, automobile gas stations, domestic waste landfills, industrial solid waste landfills, hazardous waste landfills and other places, there are hidden dangers of surface leakage or leakage problems have occurred, which seriously pollutes the surrounding groundwater and Soil affects people's living environment and life safety

[0003] With the enhancement of environmental protection awareness and stricter environmental protection regulations, people have more and more researches on underground anti-seepage, especially in polluted sites. Many industrial plants, automobile gas stations, and industrial solid waste Stockyards, tailings ponds and domestic waste landfills, these old factory areas and landfills are mostly dumped directly, without any surface anti-seepage treatment measures or the surface anti-seepage treatment standards cannot meet environmental protection requirements, or the anti-seepage facilities have been If it is destroyed, the pollutants will spread directly to the surrounding, thereby polluting the soil and groundwater. For pollution control, vertical anti-seepage is a very important aspect of underground anti-seepage engineering

[0004] For hazardous waste landfills, if the site selection does not meet the requirements of the relevant pollution control standards, the corresponding engineering method is also to choose vertical anti-seepage. The existing underground vertical anti-seepage technology can be divided into rigid vertical anti-seepage technology, plastic vertical anti-seepage technology Anti-seepage technology and flexible vertical anti-seepage technology; rigid anti-seepage technology mainly uses cement and other materials as the main anti-seepage material, which has both structural load-bearing and anti-seepage functions. As an anti-seepage technology, rigid anti-seepage has obvious shortcomings, such as elastic modulus High, the anti-deformation ability is less than 1%, it is easy to cause stress concentration and cracks, it is very difficult to connect with the soil layer with a small elastic modulus, and it is easy to form a hidden danger of leakage, and the cement has poor corrosion resistance and is easily contaminated by pollutants Corrosion damage, at the same time, the removal of the rigid cut-off wall is extremely difficult, which affects the subsequent development and construction; the plastic anti-seepage technology is an improved cut-off wall technology based on the shortcomings of the rigid anti-seepage technology, which uses bentonite, clay and other mixed materials The low-strength, low-elastic modulus, low-permeability cut-off wall material formed by replacing part of the cement in the rigid cut-off wall, but it only improves the deficiencies of the rigid cut-off wall, and cannot completely solve the problem of poor deformation resistance. It is easy to produce primary cracks during construction, and its corrosion resistance is generally weak.

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