Acoustic emission test device and operation method for rock mass in high confining pressure unloading

Abstract

The invention discloses a sound emission test device of a rock body in high-enclosure-pressure unloading and an operation method thereof. The sound emission test device comprises a sound emission sensor, a pre-amplifier, a coaxial cable, a protection case, a circular ring B, a rubber ring, a tenon, a circular ring A, a connecting rod, a mortise, a short rod, a screw bolt, a screw nut, a clamp buckle and a sensor protection device. A test block is subjected to sound emission test during the enclosure-pressure change; the study of the damage mode of the rock body in the high-enclosure-pressure unloading process after the impact load effect can be realized; relevant material kinetic parameters are provided for the scientific calculation and engineering application. In addition, the device solves the problems that in the high-enclosure-pressure cyclic impact test, the mounting and the dismounting of the sensor are inconvenient; the sensor can be easily damaged by the enclosure pressure andthe impact load; the alternate effect of blasting impact and enclosure load can be effectively simulated; the practical work state of the rock materials can be more precisely simulated; the more applicable rock material kinetic parameters can be obtained.

Description

technical field [0001] The invention relates to the technical field of rock mechanics testing and acoustic emission monitoring, in particular to an acoustic emission testing device for rock mass unloading under high confining pressure and its operating method, which is widely applicable to rock mass unloading under high confining pressure after impact loads The indoor acoustic emission test of the damage mode, damage mechanism and damage evolution law in the process. Background technique [0002] In recent years, with the needs of social development, the buried depth of engineering rock mass has also been increasing, and the deep rock mass is under the environmental conditions of high surrounding rock stress. Under the environment of high ground stress, the nature of engineering rock mass transforms from brittle to ductile, and then transforms from ductile to brittle during the excavation and unloading process. Therefore, the elastic energy stored in the rock mass is likely ...

AI Technical Summary

Problems solved by technology

[0006] In order to ensure the accuracy and effectiveness of the test data during acoustic emission detection, it is necessary to couple and fix the acoustic emission sensor and the block to be tested through a coupling agent. Damage will occur under high surrounding rock pressure and instantaneous impact load, and at the same time, the block to be tested is installed in the confining pressure device, so it is difficult to repeatedly install and disassemble the acoustic emission sensor

In summary, the existing devices cannot effectively carry out research work on the failure mechanism of rock mass during unloading under high confining pressure after cyclic impact loads

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