Rock damage acoustic monitoring device and method in freeze-thaw dry and wet environment

Abstract

The invention provides a rock damage acoustic monitoring device and method in a freeze-thaw dry and wet environment, and relates to the technical field of rock engineering. The rock damage acoustic monitoring device in the freeze-thaw dry and wet environment comprises a sample tank, a dry-wet circulating system which is used for supplying water to the top of the rock sample placed in the sample tank; a freeze-thaw circulating system which is used for adjusting the temperature of the rock sample placed in the sample tank; and an acoustic wave emission probe which is used for acquiring damage information of the rock sample. The dry-wet circulating system can simulate a rainfall environment by supplying water to the top of a rock sample, and the freeze-thaw circulating system simulates the freeze-thaw state of the rock so as to simulate the frost heaving inoculation evolution process of the rock mass in the cold region. The acoustic wave emission probe receives ultrasonic waves and sound emission signals and monitors the development, communication and damage process of the freeze-thaw cycle rock mass microfractures. The device can accurately monitor the space-time evolution process of the microscopic damage of the rock sample in the freeze-thaw dry and wet environment, and reveals the performance degradation mechanism of the rock mass in the complex environment.

Description

technical field [0001] The present application relates to the technical field of rock engineering, in particular to an acoustic monitoring device and method for rock damage in a freeze-thaw-dry-wet environment. Background technique [0002] With the continuous development of the national economy, more and more rock mass projects have been built in cold regions in my country, such as the completed Qinghai-Tibet Railway, the West-East Gas Pipeline, the upcoming Sichuan-Tibet Railway, and the planned Qinghai-Tibet Expressway. Under the condition of periodic temperature changes in rock mass engineering in cold regions, the frost heaving force generated by the pores and fissure water existing in the rock mass due to the ice-water phase transition has caused serious damage and deterioration to the rock mass, which can easily induce rock mass deterioration. Freeze-thaw damage, including microscopic damage, seepage splitting, frost heaving and cracking, etc. At the same time, rainw...

AI Technical Summary

Problems solved by technology

Ultrasonic waves and acoustic emission methods can be used to monitor the deterioration process of rocks during the freeze-thaw-dry-wet cycle in real time. However, due to the constraints of the test equipment, rock samples are mainly taken out after the freeze-thaw-dry-wet cycle to monitor the wave velocity. This method artificially splits the evolution process of rock micro-cracks, and lacks a comprehensive rational understanding of the real-time failure process of rocks during the freeze-thaw-dry-wet cycle process

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