Method for acquiring tunnel surrounding rock micro-vibration wave speed

Abstract

The invention discloses a method for acquiring tunnel surrounding rock micro-vibration wave speed. The method includes: on the basis of a gravitational search algorithm in heuristic algorithms, arranging at least four micro-vibration monitoring sensors at the rear of a tunnel face, building a tunnel space coordinate system, accurately determining the space coordinates of the sensors, using a man-made blasting event to trigger the vibration response of the sensors, and collecting the observation arrival time of the waveform signal on each sensor; setting the accumulation absolute difference ofthe observation arrival time and calculation arrival time as the target function of micro-vibration wave speed inversion, and calculating the target function until the function value meets the termination criterion to search the micro-vibration wave speed. The method has the advantages that the tunnel surrounding rock micro-vibration wave speed can be accurately acquired in real time through the blasting event of tunnel construction, and micro-vibration precision is guaranteed; the micro-vibration wave speed can be determined without special blasting activity, and the method is economical, practical, simple to operate and applicable to the micro-vibration monitoring of tunnel projects such as traffic projects and water conservancy and hydropower projects.

Description

technical field [0001] The invention relates to the field of microseismic monitoring, in particular to a method for acquiring microseismic wave velocity of tunnel surrounding rock based on a heuristic algorithm GSA, which is suitable for microseismic monitoring of various traffic, water conservancy and hydroelectric tunnel projects. Background technique [0002] Microseismic means that when the stress of the rock mass exceeds its own strength, cracks, cracks, and damage occur inside the rock mass, and the accumulated energy is released in the form of elastic waves and vibrates. 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 occurrence time of the microseismic event. Accurate microseismic wave velocity is crucial to improving the accuracy and stability of source location, and it is also...

AI Technical Summary

Problems solved by technology

However, this method can only obtain a single microseismic wave velocity, and cannot obtain the vector of microseismic wave velocity or the wave velocity on different propagation paths, and there may be a large error when using this microseismic wave velocity for positioning

[0007] The current existing technology still has the defects of high difficulty in acquisition, large workload, large error and low efficiency

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