Sand-clay mixed liner for bottom seepage proofing and crack resisting of refuse landfill

Abstract

The invention relates to a sand-clay mixed liner for bottom seepage proofing and crack resisting of a refuse landfill. The sand-clay mixed liner comprises a sand-clay mixed liner body which is formed in a manner that sand, illite clay and water are mixed and subjected to rolling compaction. The mass of the sand is larger than or equal to 10% of the total mass of the sand and the illite clay but smaller than 50% of the total mass of the sand and the illite clay. The mass of the illite clay is larger than 50% of the total mass of the sand and the illite clay but smaller than or equal to 90% of the total mass of the sand and the illite clay. The mass of the water is 15%-24% of the total mass of the sand and the illite clay. When the sand-clay mixed liner is used, the sand-clay mixed liner with the thickness being larger than or equal to 20 cm is constructed and laid on the bottom of the refuse landfill, and then refuse is buried. The sand-clay mixed liner is reasonable in structure and convenient to use, and a method is advanced and scientific. The sand-clay mixed liner can well solve the problem that underground environment pollution is accelerated by generation of liner gaps and a high leachate level.

Description

technical field [0001] The invention belongs to the field of landfill anti-seepage, in particular to a sand-clay mixed liner used for anti-seepage and anti-crack at the bottom of the landfill. Background technique [0002] my country is a country with a large population, but also a country with a large garbage output. At present, there are three commonly used waste disposal methods, incineration, landfill and composting. Among various disposal methods, sanitary landfill is widely used because of its advantages of safety and sanitation, large disposal capacity and high efficiency. More than 80% of domestic waste in my country is disposed of by landfill, and more and more waste is landfilled. field is built. [0003] The garbage in the landfill degrades over time, producing a large number of pollutants with high concentration and complex composition. These pollutants can pass through the liner through convection and diffusion, thereby polluting the underground environment. In...

AI Technical Summary

Problems solved by technology

Compacted clay has always played a very important role in the anti-seepage liner of the landfill. For some arid areas, during the construction of the landfill liner, the compacted clay often produces cracks due to water loss. The clay liner The generation of pad cracks will lead to the deterioration of its anti-seepage performance, and the dominant channels formed by cracks will accelerate the leakage of leachate, polluting groundwater and the surrounding environment

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