Method for acquiring micro seismic wave speed of high-stress hard rock TBM (Tunnel Boring Machine) construction tunnel in real time

Abstract

The invention relates to a construction tunnel micro seismic wave monitoring technology, in particular to a method for acquiring the micro seismic wave speed of a high-stress hard rock TBM (Tunnel Boring Machine) construction tunnel in real time. According to the technical scheme of the invention, the method comprises the following steps: arranging at least four micro seismic wave sensors in rock bodies behind the tunnel face of the high-stress hard rock TBM construction tunnel to acquire seismic signals generated by the breaking of rock bodies around the tunnel face; measuring the coordinates of a micro seismic source and the micro seismic sensors by taking the event of breaking of the rock bodies around the tunnel face as the micro seismic source, and acquiring a micro seismic wave speed by means of inversion when micro seismic source seismic signals monitored by the micro seismic sensors are extracted; inverting in real time along with TBM tunneling to obtain the micro seismic wave speed. By adopting the method, the micro seismic wave speed of the high-stress hard rock TMB construction tunnel can be acquired accurately in real time. The method is economical and simple, is practicable for operating, and is suitable for various high-stress hard rock TMB construction tunnels for use in water conservancy and hydropower, traffic and the like. The defects and impracticability of acquisition of wave speeds through positioning explosion and indoor sound waves are avoided.

Description

technical field [0001] The invention relates to a construction tunnel microseismic monitoring technology, in particular to a method for real-time acquisition of microseismic wave velocity of a high-stress hard rock TBM construction tunnel, which is suitable for various high-stress hard rock TBM construction tunnels such as water conservancy, hydropower, and transportation. Background technique [0002] Microseism refers to the micro-vibration in the rock mass caused by crack dislocation, cracking and destruction inside the rock mass when the stress of the rock mass exceeds its own strength, and the accumulated energy is released in the form of elastic waves. The microseismic positioning technology uses the microseismic monitoring system to collect microseismic signals, and obtains the location and time of the microseismic source through inversion. Microseismic wave velocity directly affects the accuracy and precision of microseismic positioning, which in turn affects the eff...

AI Technical Summary

Problems solved by technology

[0004] In view of the above existing problems, the object of the present invention is to provide a real-time acquisition method of microseismic wave velocity in high-stress hard rock TBM construction tunnels, which is used to solve the problem that the wave velocity is difficult to obtain accurately in real time in the microseismic monitoring and positioning of TBM construction tunnels, and improve the positioning accuracy of microseismic sources. Guarantee the microseismic monitoring effect of TBM construction tunnel

Images