Suction force controllable unsaturated soil static triaxial apparatus based on internal body variable precision measurement

Abstract

The invention discloses a suction force controllable unsaturated soil static triaxial apparatus based on internal body variable precision measurement. The static triaxial apparatus comprises a main machine part, a water circulating and pressure-stabilizing thrusting water source part and a data acquisition and processing part, wherein the water circulating and pressure-stabilizing thrusting water source part is mainly composed of two independent waterway parts formed by two thrusting pressure-stabilizing water sources, and the two independent waterway parts comprise a confining pressure control waterway for providing stable pressure for a confining pressure chamber and a monitoring waterway for precision measurement of internal body variables and suction force. The static triaxial apparatus still adopts the axis-translation technology without adopting a ceramic plate used by the traditional unsaturated instrument necessarily, and can realize precision measurement of the unsaturated soil body variables and control of the suction force in a testing process, therefore, a process that the ceramic plate is saturated is removed, the lagging problem of water drainage of the ceramic plate is solved, and the suction force in the unsaturated soil can be accurately controlled; according to the suction controllable unsaturated soil static triaxial apparatus, automatic control and measurement can be realized in the whole process, the requirements for reasonable experiment principle, high measurement precision and technical feasibility can be met, and the testing efficiency can be greatly improved.

Description

technical field [0001] The invention relates to an indoor geotechnical experiment testing device, in particular to a static triaxial instrument for studying unsaturated soil, and belongs to the category of geotechnical engineering testing and unsaturated soil mechanics experiment equipment. Background technique [0002] The soil of "civil engineering" is divided into saturated soil and unsaturated soil, and 90% of land soil belongs to the category of unsaturated soil. The higher it is, the indoor geotechnical experiment conditions are required to be consistent with the actual engineering conditions, and the indoor experimental research on the mechanical properties of unsaturated soil is the general trend. Before the 1990s, equipment development technology could not realize unsaturated mechanical testing, but since the 21st century, the international development and promotion of unsaturated soil mechanical properties experimental equipment has begun. [0003] Today, the expe...

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Problems solved by technology

Under the condition of not using the traditional clay plate, the accurate measurement of the volume change of unsaturated soil is realized, especially the method of internal volume change is used for volume variable measurement and suction control, which solves the problem of unsaturated triaxial soil in the past. The problem of unreasonable instrument test principle and low test accuracy

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