Shear test system and method for rock joint surface under high-temperature and high-pressure conditions

Abstract

The invention provides a shear test system and method for a rock joint surface under high-temperature and high-pressure conditions, relates to the field of rock mechanical tests, and solves the problems of observing the rock joint shear failure development process under the high-temperature condition and quantitatively analyzing the local deformation of the joint surface. The test system comprisesa longitudinal loading mechanism and a transverse loading mechanism which apply a normal load and a tangential load respectively, a high-temperature box is placed in a loading area, a shearing box isplaced in the high-temperature box, a roller plate is arranged between the bottom of the shearing box and the high-temperature box, and a normal bearing pressure head and a tangential bearing pressure head penetrate through the high-temperature box and are pressed on the shearing box; a vacuum glass window is arranged on the high-temperature box, a high-speed camera is arranged opposite to the vacuum glass window, cooling channels are arranged on the normal bearing pressure head and the tangential bearing pressure head, and acoustic emission probes are installed on the bearing pressure headsbetween the cooling channels and a loading oil cylinder. The system can be used for carrying out a rock joint surface shear test under the conditions of high temperature and high pressure, and the test better conforms to engineering practice.

Description

technical field [0001] The invention relates to the field of rock mechanics tests, in particular to a shear test system for rock joint surfaces under high temperature and high pressure conditions, and a method for performing tests using the shear test system for rock joint surfaces. Background technique [0002] With the rapid development of economy and science and technology, the demand for oil, natural gas, coal, metal and other underground energy and resources is increasing, especially in the construction of hydropower stations, railway engineering construction, mine construction and nuclear waste disposal. Rock mass engineering. In addition, due to the gradual reduction of shallow coal resources, new clean energy sources such as hot dry rock, geothermal energy, and combustible ice have received more and more attention. However, deep rock mass is often in a high temperature and high pressure environment, and the geothermal gradient is usually (1-3) °C / 100 meters, so deep...

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Problems solved by technology

[0005] In order to solve the problem of observing the shear failure development process of rock joints under high temperature conditions and quantitatively analyzing the local deformation of joint surfaces, the present invention provides a shear test system and method for rock joint surfaces under high temperature and high pressure conditions, which can realize real-time high temperature, Rock shear tests under high-pressure conditions, and then explore the shear mechanical properties and failure characteristics of jointed rock masses under high-stress environments. The simulated test environment is closer to deep-buried high-temperature tunnels, nuclear waste disposal warehouses, and high-temperature dry hot rock reservoirs, etc. The actual rock mass engineering, the specific technical scheme is as follows

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