Triaxial test system and method for unsaturated soil multi-field coupling

Abstract

The invention discloses a triaxial test system and a triaxial test method for unsaturated soil multi-field coupling, and relates to the field of geo-technical testing under an environmental load. The test system is characterized in that a soil sample is arranged in a triaxial pressure chamber; a confining pressure application/volume change monitoring unit, an axial force application unit, a matrix suction application unit, a temperature control unit, a chemical solution cycle permeation unit and an axial displacement measurement unit are connected/communicated with the triaxial pressure chamber respectively so as to apply each set load to the soil sample; a data acquisition unit is connected with the confining pressure application/volume change monitoring unit, the axial force application unit, the matrix suction application unit, the temperature control unit, the chemical solution cycle permeation unit and the axial displacement measurement unit respectively so as to acquire all data. The system and the method are applied to moisture desorption/absorption, solidification, non-drained shear and drained shear tests of unsaturated soil under different chemical actions and at different temperatures, and the combined determination of temperature, hydraulic power, mechanical and chemical coupling behaviors of the unsaturated soil is achieved.

Description

technical field [0001] The invention relates to the field of geotechnical tests under environmental loads, in particular to a multi-field coupled triaxial test system for unsaturated soil and a method thereof. [0002] The multi-field coupling of unsaturated soil involved in the present invention refers to the temperature, hydraulic, mechanical and chemical coupling effects of unsaturated soil, which can realize the mechanical properties of unsaturated soil under chemical loads such as salt solutions, weak acids and weak bases at different concentrations. and hydraulic experiments, and can take into account the effect of temperature. It involves the temperature, hydraulic, mechanical and chemical coupling effects of bentonite under long-term service in the nuclear waste storage process, as well as changes in the concentration and composition of the pore solution caused by changes in natural conditions, thereby changing the strength and deformation characteristics of the soil, ...

AI Technical Summary

Problems solved by technology

[0004] At present, domestic and foreign studies mainly focus on the coupled behavior of temperature, hydraulics, mechanics, and chemistry for saturated soils, but when it comes to unsaturated soils, there are fewer studies in this area, mainly because of the unsaturated soils under temperature and chemical loads. It is difficult to implement the t

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