Monitoring device and method for rock sample damage during uniaxial compression

Abstract

The invention discloses a device and a method for monitoring rock sample damage in the uniaxial compression process, which has the benefits that the joint real-time monitoring of acoustic wave, acoustic emission and electromagnetic radiation information in the uniaxial compression test process of a rock sample is realized; based on the three measurement data, different damage variable expression forms are respectively defined; on the basis of fully considering the acoustic wave velocity, acoustic emission and electromagnetic radiation variation law complementarity of the rock sample in the uniaxial compression process, a more reasonable comprehensive damage variable is provided to comprehensively and completely reflect the damage states of the rock sample at different damage stages; compared with a conventional electromagnetic measurement probe, an electromagnetic radiation measuring coil is simpler and more convenient to manufacture and can effectively shield the interference generated by ambient electromagnetic radiation noise, so that measurement results are more accurate; as the total number of turns of leads is changed, and the leads at positions with different numbers of turns are led out outwards and are respectively connected with a plurality of channels of an electromagnetic radiation detector, the simultaneous measurement of electromagnetic radiation signals within different frequency band ranges can be quickly and conveniently realized.

Description

technical field [0001] The invention belongs to the laboratory field of rock mechanics, and in particular relates to a monitoring device and a monitoring method for rock sample damage during uniaxial compression. Background technique [0002] During the construction process of geotechnical engineering, the rock mass is damaged and damaged by the excavation disturbance. The specific performance is: the internal cracks are continuously sprouting, developing and interconnecting, resulting in the attenuation of its mechanical properties and the loss of its bearing capacity. Security brings great security risks. Therefore, it is of great significance for the prevention and control of geotechnical engineering disasters to understand the damage mechanism of rocks, judge the degree of damage of rocks, and then reflect the damage of rocks in the process of stress. [0003] In rock mechanics laboratory tests, many methods can be used to detect the damage state of rocks, among which m...

AI Technical Summary

Problems solved by technology

[0005] To sum up, the use of ultrasonic wave velocity to reflect the damage changes in the process of rock loading has certain limitations, and often can only reflect the overall macroscopic damage of the rock sample, and cannot reflect the local mesoscopic damage. It can well reflect the damage and damage caused by microcracks in the early stage of rock sample loading; correspondingly, the acoustic emission and electromagnetic radiation signals can directly reflect the detailed damage and damage of rock samples, and are very sensitive to small cracks in the early loading stage

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