Novel clay functional layer material and preparation method thereof

Abstract

The invention discloses a novel clay functional layer material and a preparation method thereof. The novel clay functional layer material is mainly composed of high liquid limit clay, attapulgite clay and diatomite. The novel clay functional layer material has the following characteristics: the novel clay functional layer material has good water retention performance, and can effectively prevent soil moisture loss under extreme temperature conditions; the soil body gas diffusion coefficient is low, and diffusion of organic pollution gas can be effectively prevented; a certain adsorption function is achieved, and a certain amount of organic pollutants can be adsorbed; the permeability coefficient is low, and the anti-seepage requirement of a compacted clay layer in a common urban refuse landfill is met; main materials are natural clay minerals, belong to green renewable resources, are low in cost and long in service life, and can be widely applied to organic pollution sites.

Description

technical field [0001] The invention relates to the technical field of environmental geotechnical engineering, in particular to a novel clay functional layer material and a preparation method. Background technique [0002] In recent years, my country's industrialization and urbanization have developed rapidly, but there have been a series of serious problems such as urban land shortage, traffic congestion, and soil pollution. With the adjustment of policy needs and industrial layout, chemical plants, pesticide plants, chlor-alkali plants and other industrial enterprises have moved out of the city, leaving behind a large area of ​​industrial organic pollution sites. These organically polluted sites contain a large number of pollutants such as benzene series, total petroleum hydrocarbons, and organochlorine pesticides, which are generally characterized by high toxicity, strong volatility, and difficult treatment. Due to reasons such as inadequate treatment measures by enterpr...

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Problems solved by technology

The anti-seepage layer that exerts the barrier effect in the horizontal engineering barrier includes geomembrane, geosynthetic clay liner, and compacted clay layer from top to bottom. During the process, the compacted clay layer is directly exposed to sunlight, which is prone to dehydration and cracking; second, when the construction period is long, even if it is covered with geomembrane and geosynthetic clay liner, the compacted clay layer still has dehydration cracking Third, if the moisture content of the soil to be repaired in the lower layer is less than 5%, due to water migration, the compacted clay layer will still suffer from water loss and cracking; fourth, geomembrane damage is common during the construction process, and horizontal engineering barriers In the later stage of construction, because the geomembrane was covered with a protective layer of pebbles, it was impossible to replace the damaged geomembrane, resulting in heat conduction behavior at the damaged site, resulting in dehydration and cracking of the compacted clay layer below the damaged site

The dehydration and cracking of the compacted clay layer will increase its permeability coefficient by 2-3 orders of magnitude, and the soil diffusion coefficient will also increase significantly, seriously affecting its anti-seepage performance and gas-barrier performance. Therefore, we propose a new type of clay Functional layer material and preparation method to solve the above-mentioned problems

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