True triaxial direct shear test box and method for simulating force-heat-liquid coupling environment

Abstract

The invention discloses a true triaxial direct shear test box and a method for simulating a force-heat-liquid coupling environment, comprising a direct shear box and a test piece chamber located in the direct shear box, and the direct shear box includes a sealing gland device, loading indenter device, sliding platen device, hydraulic device and heating device. The loading indenter device includes vertical loading indenter, horizontal loading indenter and shearing indenter. The sliding pressure plate is located below the vertical loading pressure head, and the upper sliding pressure plate can slide relatively along the vertical loading pressure head; there are six side sliding pressure plates, which can slide relatively along the horizontal loading pressure head and the shear pressure head; the The hydraulic device includes hydraulic oil inlet and hydraulic oil outlet; the heating device includes heating tank and heating wire. The invention effectively simulates the rock mass environment below a kilometer, and truly reflects the shear failure characteristics of the rock mass under the force-thermal-liquid coupling environment.

Description

technical field [0001] The invention relates to a large-scale true triaxial direct shear test box and a method for simulating a force-heat-liquid coupling environment, in particular to a test box and a method that can simulate the high temperature, high ground pressure and high water in the development process of hot dry rock. Large-scale true triaxial direct shear test box and test method for pressure environment. Background technique [0002] China is a country with large reserves of geothermal resources in the world. Geothermal resources have become a new type of clean energy that is being researched and developed by countries around the world because of their extremely high cleanliness, operational stability and extensive spatial distribution. The hot dry rock resources in the depths of 3-10 km in China's land are about 260,000 times the current total annual energy consumption in China. The geothermal energy development plan specifically points out that various technolo...

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Problems solved by technology

[0004] (1) It is impossible to apply three-dimensional stress to the specimen while carrying out the shear test, or the sliding displacement of the specimen cannot be solved; (2) It is difficult to carry out the shear test under the coupling environment of high pressure ground pressure, high water pressure and high temperature, The sealing performance of the device is often not guaranteed; (3) the size of the traditional direct shear test sample is often less than 7mm, and the shear test results are difficult to reflect the real hot dry rock mass; (4) the traditional direct shear test box cannot realize the test Acoustic emission monitoring of processes

[0005] CN204807547U discloses a kind of stress-seepage coupled true triaxial shear box, mainly small-scale true triaxial direct shear-seepage test, this device cannot satisfy the condition of large-scale rock mass shear test, also does not consider high temperature, high hydraulic pressure The problem

[0006] CN103743633B discloses a fluid-solid coupling coal-rock shear-seepage test device, which is mainly used for coal-rock shear-seepage tests, and the device cannot meet the conditions of true triaxial loading and force-heat-liquid coupling

[0007] In summary, the test devices in the prior art have not yet solved the technical problems of true triaxial pressurized active shear, force-thermal-fluid coupling simulation, and large-scale samples.

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