A test device and method for simulating water injection-induced rock fracture sliding in an environment

CN122084409AActive Publication Date: 2026-05-26CHINA UNIV OF MINING & TECH +1

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: CHINA UNIV OF MINING & TECH
Filing Date: 2026-04-27
Publication Date: 2026-05-26

AI Technical Summary

Technical Problem

Existing technologies have several drawbacks in simulating the initiation and sliding of rock fractures under deep high-temperature and high-pressure geological conditions. These include unexpected sample deflection, high frictional resistance, insufficient accuracy in fracture surface displacement measurement, inability to simulate constant normal stiffness boundary conditions, temperature measurement distortion, and poor sealing performance. Consequently, the accuracy and reliability of experimental data are insufficient.

Method used

An experimental device for inducing rock fractures and sliding under simulated conditions using water injection is employed. The device includes a rigid loading frame, a confining pressure system, a heating and insulation system, a sample assembly system, a shear loading system, a pore water pressure system, a displacement measurement system, a temperature measurement system, and a sealing system. Through multi-dimensional degree-of-freedom constraint design, combination of external displacement measuring instrument and rigid transmission rod, direct temperature measurement, and dynamic sealing technology, high stiffness constraint, accurate displacement measurement, simulation of real boundary conditions, and reliable sealing are achieved.

Benefits of technology

It significantly improves the accuracy and reliability of shear test data, realizes precise measurement of fracture surface displacement under high temperature and high pressure conditions, truly restores the deep geological environment, enhances the authenticity and reliability of test results, has a wide range of applications, and expands the application scenarios of the test.

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Abstract

This invention discloses an experimental apparatus and method for simulating water injection-induced rock fracture initiation and sliding under simulated conditions, belonging to the field of rock mass engineering technology. The apparatus includes a rigid loading frame, a confining pressure system, a heating and insulation system, a sample assembly system, a shear loading system, a pore water pressure system, a displacement measurement system, a temperature measurement system, a sealing system, and a central control system. Low-friction single-degree-of-freedom motion of the sample is achieved through horizontal and vertical ball bearing mechanisms. Anti-rotation grooves and anti-rotation convex keys restrict the sample's rotation around its axial direction. Accurate measurement of fracture surface displacement is achieved through an external displacement gauge and displacement transmission rod. The central control system uses displacement feedback servo control of the confining pressure to simulate a constant normal stiffness boundary. This invention solves the technical problems of traditional apparatus, such as distorted boundary conditions, insufficient measurement accuracy, unexpected sample deflection, and poor sealing effect. It can realistically simulate the process of water injection-induced rock fracture initiation and sliding under deep geological conditions, improving the authenticity and reliability of the experimental results.

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