Method for screening rock burst warning micro-seismic events of deep buried tunnel

Abstract

The invention provides a method for screening rock burst warning micro-seismic events of a deep buried tunnel, and relates to the technical field of rock burst warning of deep buried hard rock tunnels. The method comprises the steps of first collecting micro-seismic monitoring information from the initiation to occurrence of each rock burst case, and extracting the release energy logarithm and magnitude of each micro-seismic event in each level of rock burst cases; drawing micro-seismic energy gradation curves for different levels of rock burst cases, and then calculating a release energy logarithm value corresponding to each particle size of the energy gradation curves of different levels of rock bursts; drawing the changes of the particle size values of different levels of rock bursts onthe same energy particle size curve diagram, and analyzing and calculating a mean of release energy logarithm values corresponding to the energy particle sizes when the respective levels of rock burst energy particle size curves do not cross each other at the beginning but tend to consistency later; and using the mean as a minimum integrity energy threshold of a micro-seismic catalog corresponding to a minimum integrity seismic magnitude, thus achieving the screening of the rock burst warning micro-seismic events.

Description

technical field [0001] The invention relates to the technical field of early warning of rockbursts in deep-buried hard rock tunnels, in particular to a method for screening microseismic events for early warning of rockbursts in deep-buried tunnels. Background technique [0002] Rockburst is a dynamic disaster phenomenon in which the elastic deformation accumulated in the rock mass can be suddenly and violently released under the condition of high stress due to excavation or other external disturbances, causing the rock to burst and be ejected. With the continuous construction and development of deep-buried hard rock tunnel projects in my country, the rockburst disasters are becoming more and more prominent. Sudden rockburst disasters not only seriously threaten the safety of construction personnel and equipment, but also delay the progress of the project to a large extent. Therefore, for deep-buried tunnel projects prone to rockbursts, microseismic monitoring methods are of...

AI Technical Summary

Problems solved by technology

However, for rockbursts of different grades in the same project, there is no unified and fixed screening lower limit threshold. In addition, for the linear deep tunnel engineering field where the sensor moves dynamically with the tunnel face, the use of this method may have certain limitations.

But in addition, there is no reasonable and effective microseismic catalog completeness analysis method for the screening of rockburst early warning microseismic events in the construction of foreign deep hard rock tunnels, and there are no relevant domestic reports

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