Composite underground anti-seepage isolation wall structure and construction method

Abstract

The invention discloses a composite underground anti-seepage isolation wall structure and a construction method. The composite underground anti-seepage isolation wall structure comprises a vertically-arranged wall and at least two functional layers arranged in the wall and made of different materials. The arranging direction of the functional layers is parallel to the wall, and at least one functional layer is in a plate shape. The construction method based on the above composite underground anti-seepage isolation wall structure comprises the following steps that a, the position where the anti-seepage isolation wall needs to be arranged is excavated to form a groove, wall materials are injected into the groove, and a functional layer platy material is inserted in the wall materials; b, theplaty material is inserted to the design elevation; c, a second platy material is inserted side by side, the two platy materials are connected through a buckle so that the joint sealing quality can be ensured, and percolate leaching is prevented; d, the second play material is inserted to the design elevation; and e, according to the step c and the step d, subsequent platy materials are continuously and circularly inserted till construction is finished.

Description

technical field [0001] The invention relates to a composite underground anti-seepage separation wall structure and a construction method. Background technique [0002] In recent years, my country's urbanization process is very rapid, and the level of industrial and municipal environmental protection infrastructure construction and operation management is relatively lagging behind, resulting in increasingly serious urban groundwater and soil pollution in my country. Soil pollution is defined as: Harmful and toxic substances produced by human activities enter the soil and accumulate to a certain extent, exceeding the self-purification capacity of the soil itself, resulting in changes in soil properties and quality, which constitute impacts and hazards on the human body and the ecological environment. Due to the effects of rain and scouring, leachate containing harmful components will inevitably be produced. If no effective anti-seepage measures are taken, the leachate will mig...

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Problems solved by technology

Although the compatibility of bentonite to pollutants is better than that of cement, the strength of the cut-off wall formed is low, and the scope of application is limited, and the seepage barrier performance of the wall is generally difficult to meet the specification requirements under the erosion of high-concentration composite pollutants anti-seepage standard

[0005] Although the geomembrane-bentonite composite separation wall has a low permeability coefficient and good isolation effect, the pollution site in the project is often dominated by compound pollution, often with the coexistence of various heavy metals and organic pollutants, and the pollution situation is extremely complicated. image 3 As shown in the table, the conventional single type of geotechnical material has certain limitations, and in the case of complex pollution, the leachate and the large amount of pollutants it carries are more likely to break through the barrier, greatly shortening the service life, so this single structure It is difficult for the separation wall to meet the complex pollution and seepage prevention requirements

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