Vertical anti-seepage barrier and construction method thereof

Abstract

The invention relates to a vertical anti-seepage barrier and a construction method thereof, relates to the technical field of vertical anti-seepage walls. The vertical anti-seepage barrier and the construction method mainly aim at improving the chemical corrosion prevention capacity of the vertical anti-seepage walls and improving the anti-seepage effect. According to the main adopted technical scheme, the construction method of the vertical anti-seepage barrier includes the steps that a groove is dug, wherein the bottom of the groove extends into an underground impermeable layer; a composite geo-membrane is laid on the side wall of at least one side of the groove, split bodies of the composite geo-membranes are connected in a lap joint manner through a sealant, and nonwoven fabric is arranged on the sides, facing the inner side of the groove, on the composite geo-membranes; and materials are backfilled in the groove, a vertical anti-seepage wall combined with the nonwoven fabric, facing the inner side of the groove, on the composite geo-membranes is formed in the groove, and the vertical anti-seepage barrier is composed of the composite geo-membranes, combined with one another, and the vertical anti-seepage wall. Compared with a vertical anti-seepage wall in the prior art, the permeability coefficient of the vertical anti-seepage barrier is small and smaller than or equal to 1*10<-7> cm / s, and the environment protection requirement can be met.

Description

technical field [0001] The invention relates to the technical field of vertical anti-seepage walls, in particular to a vertical anti-seepage barrier and a construction method thereof. Background technique [0002] In the process of continuous urbanization, people will produce a large amount of domestic waste in daily life, or produce a large amount of industrial waste in industrial production. For a large amount of domestic waste and industrial waste, some of them can be incinerated, and the other part that cannot be incinerated needs to be landfilled. [0003] In the landfill treatment, in order to prevent the toxic and harmful substances from penetrating from the landfill to the surrounding environment and avoid the pollution of the surrounding environment by toxic and harmful substances, a horizontal anti-seepage layer is laid at the bottom of the landfill. The vertical anti-seepage walls around the landfill are used to block the infiltration of toxic and harmful substan...

AI Technical Summary

Problems solved by technology

[0006] Plastic cut-off wall is an improved cut-off wall technology based on the shortcomings of rigid cut-off walls. It uses bentonite, clay and other admixture materials to replace part of the cement in ordinary concrete to form a low-strength, low-elastic-modulus cut-off wall material. , but it only improves the deficiencies of the rigid cut-off wall, and cannot completely solve the above problems. It is also prone to stress concentration and cracks, forming hidden parts of leakage

And poor chemical corrosion resistance

[0007] Flexible anti-seepage walls are currently widely used in water conservancy projects. They have the characteristics of simple construction, low engineering cost, similarity to the surrounding soil, and the construction site can be redeveloped and constructed. However, its anti-seepage performance is difficult to meet <1×10-7cm / s environmental requirements

HDPE vertical curtain anti-seepage technology has good chemical corrosion resistance, but it is difficult to overlap, and the problem of seepage around the joint between the groove and the geomembrane is difficult to solve

[0008] Among the above anti-seepage walls, the disadvantages of the rigid anti-seepage wall and the plastic anti-seepage wall are that they only have an isolation effect and are not resistant to chemical corrosion. Seep through the bottom of the trench and penetrate through the joint, so that the harmful substances in it can pollute the soil and groundwater

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