Soil body test system and method under hydraulic coupling effect

Abstract

The invention discloses a soil body test system and method under a hydraulic coupling effect. The system comprises a base, a lifting mechanism, a confining pressure device, an axial pressure device, a water seepage loading mechanism and a data processor, wherein the confining pressure device comprises a confining pressure chamber and a confining pressure loading measurement mechanism, and the water seepage loading mechanism comprises a water seepage part and a water collection part; the axial pressure device comprises an axial pressure loading frame, an axial pressure measuring component and a displacement meter; and the axial pressure measuring component comprises a force measuring sensor, an upper transmission rod and a lower transmission rod. The method comprises the following steps of 1, preparation before a test, 2, carrying out a consolidation test on the saturated cylindrical soil sample, 3, carrying out an axial pressure loading test on the saturated cylindrical soil sample, 4, performing a hydraulic coupling test on the saturated cylindrical soil sample, and 5, carrying out a shear failure test on the saturated cylindrical soil sample. A soil body is tested under the action of hydraulic coupling, and the axial strain, the volume strain and the permeability coefficient of the soil body are obtained, so that subsequent research on mechanical parameters of a soil sample is facilitated.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering tests, in particular to a soil test system and method under hydraulic coupling action. Background technique [0002] At present, laboratory tests to study the deformation characteristics of various soil samples under hydraulic coupling mainly include: direct shear test, consolidation test based on consolidation instrument, and conventional triaxial shear test. Since the direct shear instrument does not have a water seepage device, it can only carry out shear tests on soil samples under different water content conditions, that is, the "double-line method", so it cannot directly reflect the mechanical properties of the soil sample during the infiltration process; and the direct shear instrument cannot During the shearing process, mechanical parameters such as axial strain, volumetric strain and permeability coefficient of the soil sample were measured. Although the consolidation instrument c...

AI Technical Summary

Problems solved by technology

The soil sample is in an unsaturated state during the water seepage process in the triaxial shear instrument, so the displacement measured in the drainage pipe cannot represent the volumetric strain

That is to say, the conventional triaxial shear instrument can carry out the hydraulic coupling test, but it cannot measure the volume strain and permeability coefficient of the sample, and the volume strain and permeability coefficient are important indicators reflecting the structure change, compactness and permeability characteristics of the soil sample.

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