A testing method for real-time determination of microseismic wave velocity

Abstract

The invention discloses a testing method for determining microquake wave velocity in real time and is applicable to microquake positioning and monitoring of various rock projects including mines, oil and side slopes. By utilizing microquake sensors of a microquake monitoring system and artificial explosion of a given seismic hypocenter, the microquake wave velocity is determined in real time. The testing method includes steps of accurately measuring spatial coordinates of the microquake sensors and the artificial explosion events within a spatial coordinate system of the microquake monitoring system; setting the microquake sensor firstly triggered as a control object when microquake waves monitored by the microquake sensors in the microquake monitoring system are picked up, and inverting the microquake wave velocity in real time by means of the arrival time difference between the other microquake sensors and the first-triggered microquake sensor and the distance difference between the microquake sensors and the artificial explosion hypocenter. In the wake of mining engineering, the testing method can accurately acquire the microquake wave velocity in real time, labor and financial consumption caused by remounting of the microquake sensor is avoided, and the testing method is simple in operation, economic and feasible.

Description

technical field [0001] The invention relates to a test method, in particular to a test method for real-time determination of microseismic wave velocity applicable to various geotechnical projects such as mines, petroleum and slopes, and belongs to the field of microseismic positioning and monitoring. Background technique [0002] Microseismic monitoring technology refers to a geophysical real-time monitoring technology that uses microseismic signals generated during rock mass rupture to study and evaluate rock mass stability in geotechnical engineering. This technology was first used to study rockburst in hard rock mines. In recent years, microseismic monitoring technology has been widely used in various geotechnical engineering. Microseismic source location is the core of microseismic monitoring technology. It uses the microseismic waveform signal recorded by the microseismic sensor, arrival data and microseismic wave velocity to invert the spatial coordinates and occurrenc...

AI Technical Summary

Problems solved by technology

Due to the positioning error of the coordinate estimation value of the microseismic point itself, there will be an error in the calculated seismic wave velocity

Chinese Patent Publication No. CN103697999A, the title of the invention is "A Method for Real-time Acquisition of Microseismic Wave Velocity in High Stress Hard Rock TBM Construction Tunnel". The rock mass damage event near the face of the tunnel is used as the microseismic source to measure the spatial coordinates of the rock mass damage event. Since the rock mass damage usually occurs in the deep part of the rock mass, and the actual damage location is unknown, the measured spatial coordinates must have large Therefore, it has a certain influence on the microseismic wave velocity obtained by inversion of the coordinate point as a microseismic source

In addition, in order to obtain the microseismic wave velocity, both of the above two methods need to specially arrange microseismic sensors, which will inevitably lead to the consumption of manpower and financial resources to a certain extent.

Images