Triaxial creep tester of unsaturated soil

Abstract

The invention discloses a triaxial creep tester of unsaturated soil, and relates to a geotechnical test apparatus. By inlaying a china clay plate with high air entry value in the pedestal of a pressure chamber, the geotechnical test apparatus allows water in a soil sample to pass through the china clay plate, but exerted gas cannot pass through, thereby realizing the aims of controlling groundmass suction and ensuring waterdrainage. The upper part of the china clay plate has a sample sleeved with a rubber membrane, and the upper part of the sample is provided with a porous plate and a sample cap; the sample cap is connected with a set of pipelines capable of controlling air pressure to exert pore air pressure on the sample and control pore air pressure; and the bottom of the china clay plate is respectively connected with a wash pipe and a drainpipe which play roles in washing air bubbles on the bottom of the china clay plate and waterdrainage respectively. A sample pressure chamber adopts a double-layer pressure chamber, namely a double-layer organic glass cylinder. An inner pressure chamber is filled with air-free water to exert a confining pressure on the sample, while an outer pressure chamber exerts an air pressure of equivalent confining pressure value to eliminate the influence on bulk variate caused by the deformation of the inner pressure chamber.

Description

technical field [0001] The invention relates to a soil engineering test instrument, in particular to a triaxial creep test instrument for unsaturated soil. Background technique [0002] At present, the saturated triaxial creep tester is mainly composed of bench sub-components, lever loading components, weight components, sample pressure chamber components, pore pressure measuring instruments, confining pressure and suction controllers, etc. It is mainly used for saturated triaxial creep tests on soil samples. Since the saturated triaxial creep test does not need to consider the influence of the matrix suction, the saturated triaxial creep instrument does not have instrument components to control the matrix suction, so it cannot simulate the rheological behavior of the soil in the unsaturated state, nor can it Further establish the mathematical model of unsaturated soil rheology, etc. Contents of the invention [0003] The technical problem to be solved by the present inv...

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Problems solved by technology

Since the saturated triaxial creep test does not need to consider the influence of matrix suction, the saturated triaxial creep instrument does not have instrument components to control the matrix suction, so it cannot simulate the rheological behavior of soil in the unsaturated state, nor can it Further establish the mathematical model of unsaturated soil rheology, etc.

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