Soil gas-liquid permeation test system for isotropic dry-wet chemical circulation

Abstract

The invention provides a soil gas-liquid permeation test system for isotropic dry-wet chemical circulation. The system comprises an organic glass cover which covers a stainless steel base, a verticalloading rod passes through a top of the organic glass cover, and a piston is fixedly connected under the vertical loading rod. A reaction chamber exhaust hole is formed in the top of the organic glasscover. A stainless steel sample base is arranged, a sample base is installed on the stainless steel sample base to serve as a soil sample containing platform, an inner confining pressure control system is arranged to be matched with the vertical loading rod to simulate the pressure borne by a soil sample in a complex environment, and a suction control system is arranged to simulate the soil sample drying process. The method is simple and easy to implement, the deformation characteristics and gas-liquid permeation law evolution of soil under complex test conditions can be monitored in real time, researchers can be helped to understand permeation, mechanics and deformation evolution mechanisms of the soil in a complex field environment, and the development of engineering disposal methods and basic theories is effectively helped.

Description

technical field

[0001] The invention relates to the technical fields of geological engineering and geotechnical engineering, in particular to an isotropic isotropic dry-wet chemical cycle soil gas-liquid penetration test system. Background technique

[0002] In recent years, with the change of extreme weather, the permeability of clay in complex environment, the change of mechanical behavior and the change law of gas-liquid permeability parameters of soil under dry-wet cycle have become the hotspots of research. Clay is a material with memory behavior. In rainy and humid seasons, the soil swells when it absorbs water; in dry seasons with little rain, the soil shrinks due to evaporation and loss of water. So reciprocating, the soil sample will be in the wet-dry alternate environment for a long time. This effect will lead to the following two changes in the soil sample: (1) During the dry-wet cycle process, a tensile stress field is gradually formed inside the soil. When the...

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