Construction method of flexible vertical anti-seepage wall for blocking underground water pollution

Abstract

The invention provides a construction method of a flexible vertical anti-seepage wall for blocking underground water pollution. The construction method comprises the following steps of: S101, carryingout construction measurement and positioning and paying off; S102, flattening a field; S103, carrying out high-pressure jet grouting piles on two sides of a pre-formed groove position; S104, arranging guide walls at the tops of the high-pressure jet grouting piles; S105, carrying out groove forming construction; S106, paving HDPE (high-Density polyethylene) geomembranes in a groove; S107, mutually sealing and connecting the adjacent HDPE geomembranes; S108, pouring a sealing material into the bottom of the groove to the bottoms of the HDPE geomembranes; and S109, carrying out clay backfillingon the upper part in the groove and connecting the sealing material at the bottom of the groove. By adopting the process provided by the invention, continuous closing and no-leakage-point pollution blocking can be realized in the vertical direction. A flexible anti-seepage material adopts the HDPE geomembranes and the service life of an anti-seepage system can reach 50 years; the permeability coefficient is less than 10< -7 >cm / S.

Description

technical field [0001] The invention relates to the technical field of anti-seepage of polluted sites, in particular to a construction method for a flexible vertical anti-seepage wall used for blocking groundwater pollution. Background technique [0002] As people pay more and more attention to environmental protection, and due to the development of society and economy, the pollution emergency accidents involved frequently occur. It is urgent to block and prevent pollution sources to avoid material and economic losses caused by further expansion of pollution. After isolation control, technologies such as in-situ remediation can be used to treat polluted soil and water bodies. [0003] Vertical anti-seepage technology mainly uses underground anti-seepage wall technology to block and seal pollutants or change the flow direction of groundwater to achieve the purpose of controlling the horizontal migration of pollution. [0004] The traditional anti-seepage wall technology has ...

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Problems solved by technology

[0006] However, due to the complex geological conditions of the project site, the construction of the flexible vertical cutoff wall also has problems such as difficulty in groove formation, low efficiency in groove formation, difficulty in membrane connection, and difficulty in lowering and laying HDPE geomembrane in ultra-deep (30-60m) mud environments.

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