Pressure maintaining device in rock creep impact and micro-fracture scanning experiment and experiment method

Abstract

The invention discloses a pressure maintaining device in a rock creep impact and micro-fracture scanning experiment and an experiment method, and relates to the field of rock mechanics experiments. The pressure maintaining device comprises a pressure bearing mechanism, constant-pressure locking mechanisms and a pressure real-time monitoring and adjusting mechanism, wherein the pressure bearing mechanism comprises a cylindrical panel, an upper panel and a lower panel; four groups of constant-pressure locking mechanisms are arranged; the constant-pressure locking mechanisms are arranged at fourcorners of the upper panel and four corners of the lower panel respectively; each constant-pressure locking mechanism comprises a cylindrical pressing rod and a hydraulic locking device; and the pressure real-time monitoring and adjusting mechanism is composed of a pressure sensor, an intelligent pressure control pivot and a hydraulic pressure supplementing device, and real-time pressure detectionand adjustment in the pressure maintaining process can be achieved. By adopting the pressure maintaining device, static load pressure of a rock test piece can be immediately locked and stabilized inthe conventional mechanical experiment process of the rock test piece, the real-time test of other physical and mechanical properties of a coal and rock mass test piece in the mechanical loading testprocess is realized, and the rock mechanical property research under multi-field coupling can be realized.

Description

technical field [0001] The invention relates to the field of rock mechanics experiments, in particular to a pressure maintaining device and an experiment method in the micro-crack detection process of rock dynamics experiments. Background technique [0002] The rock creep impact mechanics experiment is the main technical means to study the dynamic response (including deformation characteristics, failure mechanism, etc.) The failure mechanism requires real-time detection of the development and development of internal micro-cracks during the loading process of rock dynamics experiments. At this time, micro-crack detection methods such as CT scanning, acoustic emission, etc. must be combined with rock creep impact test equipment. However, there are still great difficulties in real-time microscopic fracture detection during rock loading, and there is no good solution in terms of experimental equipment and methods. The main technical problems are: [0003] (1) At present, the m...

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Problems solved by technology

[0003] (1) At present, the main experimental equipment for micro-crack detection, such as CT scanner, acoustic emission test machine, etc., cannot be effectively connected with the rock loading test equipment, such as the rock rheological disturbance effect tester, so it cannot be used in the creep impact test. Real-time scanning and detection of micro-cracks inside rocks;

[0004] (2) The current rock rheological disturbance effect tester performs a disturbance impact under certain static load and pressurization conditions. If you want to perform CT scanning or acoustic emission experiments, you need to remove the rock specimen and put it in the fracture scanning device , but this will cause the pressure unloading of the specimen and lead to the closure of its internal micro-cracks, making the experimental results inaccurate and even unable to obtain the desired results

[0005] (3) At present, there is no integrated equipment that can meet the requirements of creep shock and micro-crack scanning experiments at the same time

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