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

A rockburst and microseismic technology, applied in seismology, seismic signal processing, measuring devices, etc., can solve the problems of lack of screening lower limit threshold and no relevant literature reports, etc., to eliminate the influence and improve the accuracy

Active Publication Date: 2019-12-24
NORTHEASTERN UNIV
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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 certa

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

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[0029] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] In this embodiment, a deep-buried hard rock tunnel with frequent rockbursts is taken as an example, and the method of the present invention is used to screen microseismic events.

[0031] A microseismic catalog completeness analysis method for rockburst early warning microseismic event screening in deep tunnels, such as figure 1 shown, including the following steps:

[0032] Step 1. Carry out microseismic monitoring during the excavation process of the deep tunnel, and obtain microseismic information of surrounding rock rupture during the tunnel excavation process;

[0033] Step 2. For different grades of rockbursts that have occurred, respectively select rockburs...

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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...

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/288G01V2210/123
Inventor 牛文静冯夏庭姚志宾张伟肖亚勋丰光亮胡磊李鹏翔张宇
Owner NORTHEASTERN UNIV
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