Water-heat-force coupling testing system for large-scale high-pressure soil mass freeze thawing process

Abstract

The invention relates to a water-heat-force coupling testing system for a large-scale high-pressure soil mass freeze thawing process. The system comprises a test bench, and a loading system, a temperature control system, a water charging system and a data acquisition system which are connected with the test bench. A test bench main body is a sampling barrel, can bear the maximum internal pressure of 15MPa and can contain a maximum sample of phi 500mm*1000mm. The loading system is arranged on the upper part of the test bench, the water charging system is arranged on the bottom of the test bench, and a sensor is buried in a soil mass and can acquire internal temperature, water and stress information of the soil mass. The temperature control system consists of a top plate, a barrel body, a bottom temperature control tube, a thermal insulation layer and a high and low temperature thermostatic bath and has a good temperature control effect. By virtue of the system, freeze thawing tests can be performed on large-scale samples according to a high-pressure solidification-loading freezing path, a dynamic water-heat-force coupling function in a freeze thawing process can be directly understood, and a deep soil mass freeze thawing process can be stimulated more truly, so that support is provided for water-heat-force coupling researches in the technical field of artificial deep stratum freezing.

Description

technical field [0001] The invention discloses a water-heat-mechanical coupling test system for large-scale high-pressure soil freezing and thawing. The test system can conduct multiple freeze-thaw tests on large-scale samples according to the high-pressure consolidation-loaded freezing path. And it can automatically acquire and store temperature, moisture and stress information in real time, and is especially suitable for research on the water-heat-mechanical coupling effect of deep soil freeze-thaw process in the technical field of artificially frozen strata with a thickness of 400-800m. Background technique [0002] In the field of artificial strata freezing technology, with the increase in the depth of resource exploitation, some basic problems of frozen soil mechanics involved in the 400-800m thick topsoil freezing technology in the central and eastern regions of my country have attracted increasing attention, such as the water-heat- force coupling problem. An in-depth ...

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Problems solved by technology

[0005] The present invention aims to overcome the shortcomings and deficiencies of existing soil freeze-thaw test devices, and provides a test system that can satisfy the research of water-heat-mechanical coupling in deep soil freeze-thaw processes. The system can be used to test large-scale samples. High-pressure consolidation and on-load freezing can obtain real-time changes in soil temperature, moisture and stress during the freeze-thaw process

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