Controllable Suction Static Triaxial Instrument for Unsaturated Soil Based on Precision Measurement of Internal Volume Variation

Abstract

The invention discloses a suction controllable unsaturated soil static triaxial instrument based on internal body variable precision measurement, which includes a main machine part, a water circulation and pressure stabilizing thrust water source part, and a data acquisition and processing part. Among them, the water circulation and pressure-stabilizing thrust water source part are mainly composed of two independent waterway parts composed of two thrust-stabilizing water sources, namely, the confining pressure control waterway for providing stable pressure in the confining pressure chamber and the precise measurement of internal volume change and suction. Measured monitoring waterways. The present invention does not use the clay plate that must be used in the traditional unsaturated instrument, but still uses the axis translation technology to realize the accurate measurement of the unsaturated soil volume change and the control of the suction during the test, thus omitting the process of saturating the clay plate and avoiding solves the problem of lagging drainage of clay slabs and precisely controls suction in unsaturated soils. The invention can realize automatic control and measurement in the whole process, meets the requirements of reasonable experimental principle, high measurement accuracy and technical feasibility, and greatly improves the efficiency of the experiment.

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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