Unsaturated soil gas permeability coefficient measuring device in field of environmental rock and soil

Abstract

The invention discloses an unsaturated soil gas permeability coefficient measuring device in the field of environmental rock soil. The unsaturated soil gas permeability coefficient measuring device comprises a gas supply device, a testing device and a tail gas treatment device. The gas supply device comprises a gas storage bottle and an air compressor, the gas storage bottle is connected with a regulating valve, a pressure gauge and a mass flow controller, the air compressor is connected with the regulating valve, the pressure gauge and a glass rotor flow meter, and the gas storage bottle and the air compressor are connected to the cavity through a vent valve; and the testing device comprises a cylindrical soil sample chamber, a soil humidity temperature sensor, a soil mass pressure sensor and a digital electronic differential pressure sensor. The permeability coefficient of a gas in the soil mass can be simply and efficiently measured, the measurement result is more accurate, soil sample permeability and water retention performance modified materials can be rapidly screened, and measurement of a gas flow, a gas pressure difference, a soil internal temperature change and a water content change can be substituted into a calculation formula of the gas permeability coefficient.

Description

Technical field: [0001] The invention relates to the interdisciplinary technical field of environmental rock and soil and unsaturated soil mechanics, in particular, a device for measuring the gas permeability coefficient of unsaturated soil in the field of environmental rock and soil is designed. Background technique: [0002] The mining field industry in Southwest my country plays an important role in the economic and social development of our country. However, in recent years, due to the unreasonable use of mine tailings storage yards and tailings ponds, a large amount of environmental pollution has been caused, especially in mine polluted sites. VOCs, volatile organic gases, can cause serious harm to the human body, the ecological environment, animals and plants, so the soil restoration of mine-contaminated sites urgently needs to be followed up. Vertical barrier and horizontal barrier systems are barrier technologies with high cost performance in soil remediation technolo...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings of the complex calculation method of the permeability coefficient in the prior art, and the inability to accurately and real-time monitor the water content of the soil and the internal temperature of the soil, and propose a measurement of the permeability coefficient of unsaturated soil in the field of environmental rock and soil device

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