Device for testing gas diffusion coefficients of GM/GCL under different contact conditions

Abstract

The invention discloses a test instrument and method for testing gas diffusion coefficients of a horizontal barrier system of a geomembrane, a bentonite waterproof pad and a compacted clay layer underdifferent contact conditions. The instrument consists of a pressurizing part, a permeable stone, a soil sample, a porous breathable material, an air inlet, an air outlet, a valve, an air storage chamber, a geomembrane or geosynthetic liner and an oxygen sensor. According to the invention, loads with different sizes and different types of concentration conditions can be autonomously and conveniently applied to the GM / GCL and the upper end of the soil body or the size of a gap between the soil and the geomembrane is changed, thus the different contact degrees of the two can be changed. On the other hand, by calculating the gas diffusion coefficient of the sample structure, the gas diffusion coefficient indirectly corresponds to the contact mode between the GM / GCL and the soil body one to one, and therefore quantitative calculation and research are conducted on the contact mode of the GM / GCL and the soil body.

Description

technical field [0001] The invention relates to the field of gas diffusion coefficient measurement, and in particular discloses a test instrument and method for testing the gas diffusion coefficient of a horizontal barrier system of a geomembrane, a bentonite waterproof pad and a compacted clay layer under different contact conditions. Background technique [0002] During the landfill treatment of municipal solid waste, landfill gas represented by methane, as a greenhouse gas, has seriously affected the natural environment. Due to the accelerated urbanization process in our country, many polluted sites left over from the relocation of industrial sites have been left in the original city limits. Statistical results show that volatile and semi-volatile organic pollutants (VOCs / SVOCs) include petroleum pollutants, organochlorine solvents, persistent organic pollutants (POPs) such as polychlorinated biphenyls, polycyclic aromatic hydrocarbons, organochlorine pesticides, etc. It ...

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Problems solved by technology

[0008] The invention provides a test instrument and method for testing the gas diffusion coefficient of the horizontal barrier system of the GM / GCL and the compacted clay layer under different contact conditions, which solves the problem of the current domestic devices and methods for the GM / GCL and the compacted clay layer. The problem that the degree of contact between solid clay layers cannot be quantitatively calculated

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