Acoustical emitting and resistivity joint monitoring device and monitoring method of fracture process of rock specimen

Abstract

The invention discloses an acoustical emitting and resistivity joint monitoring device and a monitoring method of a fracture process of a rock specimen. According to the acoustical emitting and resistivity joint monitoring device, an electrode at the front end of an acoustical-electrical integrating testing probe on an acoustical-electrical integrating testing probe holding device is connected with a drill hole in the rock specimen; the acoustical emitting acquiring module and a resistivity acquiring module are both connected with a data processing system; the data processing system is connected with a real-time display system; the rock specimen is placed between two bearing plates of a rigid servo press; and a stress acquiring module and a strain acquiring module are both connected with the data processing system, and therefore, the acoustical emitting data, the resistivity data and the stress-strain data can be synchronously acquired in real time during the rock uniaxial compression test; and the resistivity acquiring module is used for automatically acquiring the resistivity data at ultrahigh frequency, and automatically improving the resistivity acquiring frequency after accepting feedback control, so that the resistivity variation data of the rock specimen in the fracture process can be completely acquired, and as a result, the fracture information of the rock specimen can be dynamically captured in real time.

Description

technical field [0001] The invention relates to a combined real-time monitoring device of acoustic emission and resistivity, in particular to a combined monitoring device and monitoring method of acoustic emission and resistivity in the rock sample rupture process. Background technique [0002] As we all know, rock is a very complex mechanical medium formed under long-term geological conditions. influences. However, traditional rock mechanics tests, such as uniaxial compression tests and shear tests, can only obtain parameters such as elastic modulus, Poisson's ratio, compressive strength, and shear strength, which are far from enough to describe the physical and mechanical properties of rocks. Not enough. Therefore, some scholars have introduced resistivity and acoustic emission techniques to study the fracture process of rocks. [0003] As a basic physical parameter of rock, resistivity reflects the quality of rock conductivity, and its change can directly reflect the o...

AI Technical Summary

Problems solved by technology

[0005] To sum up, the existing rock fracture process monitoring methods have the following problems: ① The mechanical parameters obtained by the traditional rock uniaxial compression test are not accurate enough to describe the rock fracture process, and the existing monitoring methods, such as resistivity and Acoustic emission monitoring methods have their own limitations, so it is not accurate to judge and analyze the rock fracture process only by a single monitoring method; ② most of the existing resistivity monitoring methods are limited by the low sampling frequency of the instrument and cannot complete Recording the change of resistivity at the moment of rock rupture may lead to the loss of key information and affect the analysis results; ③The existing acoustic emission monitoring method is weak in resisting external environmental noise and is easily disturbed by surrounding noise, resulting in monitoring results There are errors, and at the same time, the layout of the acoustic emission probe is time-consuming and labor-intensive during the test, making the test efficiency very low

Images