Pressure-holding device and experimental method in rock creep impact and micro-crack scanning experiments

Abstract

The invention discloses a pressure-holding device and an experimental method in rock creep impact and micro-crack scanning experiments, and relates to the field of rock mechanics experiments. It includes a pressure bearing mechanism, a constant pressure locking mechanism and a real-time pressure monitoring and adjustment mechanism. The pressure bearing mechanism includes a cylindrical panel, an upper panel and a lower panel. There are four sets of constant pressure locking mechanisms, which are respectively arranged on the upper panel and the four corners of the lower panel, each set of constant pressure locking mechanism includes a cylindrical pressure rod and a hydraulic locking device, and the pressure real-time monitoring and adjusting mechanism is divided into three parts: pressure sensor, intelligent pressure control hub and hydraulic pressure supplementing device, which can Realize real-time pressure detection and adjustment during the pressure holding process. The present invention can instantly lock and stabilize the static load pressure of the rock test piece during the conventional mechanical experiment process, realize the real-time test of other physical and mechanical characteristics of the coal rock mass test piece during the mechanical loading test (process), and can realize multiple Research on rock mechanical properties under field coupling.

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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