High temperature and high pressure true triaxial direct shear fracture seepage coupling test device and its application method

Abstract

The invention relates to a high-temperature and high-pressure true triaxial direct shear fracture-seepage coupling test device. Two first indenters and two pressure components are arranged above and below the rock sample in a manner symmetrical to the center of the rock sample. The two second indenters are arranged on the left and right sides of the rock sample in a symmetrical manner with respect to the center of the rock sample. The first indenter includes a first indenter main body provided with a groove. A part of the pressure component is accommodated in the groove. The pressure component includes a rubber bladder and a backing plate, and the rubber bladder applies pressure to the rock sample through the backing plate. The seepage medium in the first seepage network groove provided on the main body of the first indenter and the second seepage network groove provided on the backing plate applies osmotic pressure to the rock sample. The triaxial testing machine applies lateral confining pressure, axial pressure and high temperature to the rock sample. The beneficial effect is that the test device is combined with a triaxial testing machine, can carry out a true triaxial direct shear fracture seepage test on a rock sample under high temperature and high pressure conditions, and has high practicability and reliability.

Description

technical field [0001] The invention relates to the technical field of rock experiments, in particular to a high-temperature, high-pressure true triaxial direct shear fracture seepage coupling test device and a use method. Background technique [0002] Resource extraction and energy development in geotechnical engineering include nuclear waste treatment, carbon dioxide sequestration, deep well injection, geothermal energy production, and oil and gas production. With the continuous utilization of resources in shallow geotechnical engineering, the mining depth of geotechnical engineering has continued to increase. The basic occurrence environment of deep geotechnical engineering is a high-temperature, three-dimensional, high-stress, and high-fluid-pressure environment. In order to better improve the safety of deep geotechnical engineering mining and development, avoid fluid medium injection into rock fractures to induce earthquakes and CO 2 Casualties and construction delays ...

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a high-temperature and high-pressure true triaxial direct shear fracture seepage coupling test device and its use method, which solves the problem that high temperature and high osmotic pressure cannot be provided for the true triaxial direct shear fracture test of rocks. Environmental conditions, unable to meet the technical problems of direct shear fracture seepage coupling test in the multiple coupling environment of high temperature-high osmotic pressure-high lateral confining pressure on rock samples at the same time

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