Unsaturated soil high-temperature high-pressure high-suction triaxial instrument and sample preparation mould

Abstract

The invention discloses an unsaturated soil high-temperature high-pressure high-suction triaxial instrument and a sample preparation mould. The triaxial instrument comprises a rack, a pressure chamber, an axial load piston, a load sensor, a displacement sensor, an axial load and axial deformation rate control / data acquisition processing system, a water, electricity and gas control cabinet and a temperature control box with a special structure. Two models including a high-temperature, high-pressure and low-suction model and a high-temperature, high-pressure and high-suction model are researchedand developed. The operating temperature of the high-temperature, high-pressure and low-suction model ranges from normal temperature to 150 DEG C, the confining pressure of the high-temperature, high-pressure and low-suction model ranges from 0 to 10MPa, the suction of the high-temperature, high-pressure and low-suction model ranges from 0 to 1.5MPa, and the high-temperature, high-pressure and low-suction model is applicable to general unsaturated soil. The operating temperature range and the confining pressure range of the high-temperature, high-pressure and high-suction model are as same asthose of the high-temperature, high-pressure and low-suction model, the suction of the high-temperature, high-pressure and high-suction model can range from 0 to 500MPa, and the high-temperature, high-pressure and high-suction model is applicable to buffer / backfill materials. By the aid of a sample preparation device and a petal-type sample preparation mould which are matched, sample preparationand demoulding are facilitated, working efficiency is improved, disturbance for a sample in the demoulding process is decreased, and the problem of difficulty in demoulding a high-density sample prepared by a traditional method is solved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering testing equipment, and in particular relates to a high-temperature, high-pressure, high-suction triaxial instrument and a sample preparation mold for unsaturated soil. Background technique [0002] Buffer / backfill materials have high suction (up to hundreds of MPa), and work under high temperature (about 100°C) and high pressure for a long time. Such special engineering materials and harsh working conditions have never been encountered in civil engineering. In order to provide a scientific basis for the design of deep geological reservoirs in my country, it is imperative to study the thermodynamic properties of buffer / backfill materials. However, the existing geotechnical triaxial instruments cannot control the test temperature and test the suction of soil samples (especially high suction), so it is difficult to reveal The laws of thermodynamic properties of cushioning / backfilling ...

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Problems solved by technology

In order to provide a scientific basis for the design of deep geological reservoirs in my country, it is imperative to study the thermodynamic properties of buffer / backfill materials. However, the existing geotechnical triaxial instruments cannot control the test temperature and test the suction of soil samples (especially high suction), so it is difficult to reveal The laws of thermodynamic properties and the determination of the deformation strength parameters of buffer / backfill materials with high suction and working in high-temperature environments are powerless. Existing soil mechanics test equipment is powerless for this

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