Device and method for measuring depth of loose circle of tunnel surrounding rock by using microseismic signal

Abstract

The invention discloses a device and a method for measuring the depth of a tunnel surrounding rock loose circle by using a micro-seismic signal. The device comprises a micro-seismic sensor, a sensor arranging and fixing device, a micro-seismic signal excitation device and a micro-seismic signal time-frequency analysis device, the sensor arranging and fixing device comprises a multifunctional rod, an air bag, an inflation device, a guide pipe and a signal transmission cable. A plurality of micro-seismic sensors can be flexibly arranged on a multifunctional rod, the multifunctional rod is inserted into a test hole, an air bag in the hole is inflated and expanded by adopting an inflation device, and the micro-seismic sensors are in close contact with surrounding rock by applying pressure to the multifunctional rod; the micro-seismic signal excitation device is used for generating vibration waves on the surface of surrounding rock around the orifice and propagating the vibration waves into the orifice; the microseismic signal time-frequency analysis device is used for automatic generation and real-time identification of a Mel time-frequency voiceprint graph. According to the method, a pre-trained AST deep learning model is adopted to identify the voiceprint feature difference between the loose circle and the complete surrounding rock in real time, and efficient and accurate measurement of the loose circle of the surrounding rock of the deep tunnel is achieved.

Description

technical field [0001] The invention belongs to the field of microseismic monitoring, and in particular relates to a device and method for measuring the depth of a tunnel surrounding rock loose circle by using microseismic signals, which can distinguish the difference degree of changes in Mel time-frequency voiceprint patterns of microseismic signals obtained by arranging microseismic sensors at different depths , and accurately measure the loose circle of the surrounding rock of the tunnel, which has guiding significance for the design of tunnel support and disaster reduction and prevention. Background technique [0002] After the excavation and unloading of deep tunnels, the stress redistribution of the surrounding rocks leads to obvious cracks in the surrounding rocks near the excavation face. The depth of the surrounding rock loose circle is an important parameter in the design of deep tunnel reinforcement and support, and an important basis for disaster reduction and pr...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a device and method for measuring the depth of the loose ring of the tunnel surrounding rock by using microseismic signals, aiming at the problems of heavy measurement workload, low measurement accuracy and complicated operation of the existing tunnel surrounding rock loose ring. It can measure the depth of the surrounding rock loose circle in any situation; and the method uses the pre-trained AST deep learning model to identify the difference in the characteristics of the Mel time-frequency voiceprint between the loose circle and the complete surrounding rock in real time, so as to realize the loosening circle of the deep tunnel surrounding rock Efficient and accurate measurement

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