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Rock burst premonition identification method based on microearthquake frequency spectrum evolution

A technology of rock burst and identification method, applied in the direction of seismic signal processing, etc., can solve the problems of low accuracy, economic disadvantage, time-consuming and labor-intensive, etc., and achieve the effect of improving accuracy

Inactive Publication Date: 2014-09-03
CHINA UNIV OF MINING & TECH
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Problems solved by technology

The traditional mine pressure monitoring method has large limitations and low accuracy; it is time-consuming and labor-intensive, personnel need to record on site, and the safety is low; the economic disadvantage is obvious

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  • Rock burst premonition identification method based on microearthquake frequency spectrum evolution
  • Rock burst premonition identification method based on microearthquake frequency spectrum evolution
  • Rock burst premonition identification method based on microearthquake frequency spectrum evolution

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with accompanying drawing.

[0023] 1. Fissure development:

[0024] Through the acoustic emission experiment, it is concluded that the acoustic emission count rate-time curve of the rock damage evolution during the loading process presents four distinct stages, namely the initial stage of acoustic emission, the quiet stage of acoustic emission, the growth stage of acoustic emission, and the stable stage of acoustic emission . The first two stages are located in the compaction stage of the rock damage process, and the latter two stages correspond to the elastic deformation stage and the plastic deformation to failure stage of rock damage respectively, corresponding to the development process of rock internal cracks.

[0025] like figure 1 As shown, the theoretical analysis shows that before the rock is compressed, there are many small cracks; during the compression process, the small cracks continue ...

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Abstract

The invention discloses a rock burst premonition identification method based on microearthquake frequency spectrum evolution. The method specifically comprises the steps that (1) a sensor in a microearthquake monitoring system detects rock burst and converts the rock burst into a microearthquake signal which is transmitted to a data processing module in the microearthquake monitoring system; (2) the microearthquake signal is filtered through the data processing module of the microearthquake monitoring system so that the interference of noise signals can be eliminated; (3) data extraction is conducted on the filtered signal through a spectral analysis module of the microearthquake monitoring system; (4) the extracted data are used for calculating the ratio of energy on the same frequency band (with intervals of 1Hz) to total energy, namely basic frequency; (5) the basic frequency of the processed microearthquake signal is displayed through an oscilloscope. By means of spectral analysis of the microearthquake signal and display achieved through the oscilloscope, real-time display for warning can be realized, and accuracy is high.

Description

technical field [0001] The invention relates to a rock burst precursor identification method, in particular to a rock burst precursor identification method based on microseismic spectrum evolution. Background technique [0002] In recent years, with the increasing depth of coal mining in my country, the problem of rock burst in many mining areas has become more and more serious. The pressure in the coal rock mass exceeds the strength limit, and the energy accumulated in the coal rock mass around the roadway or the stope is released suddenly, and an explosive accident occurs in the roadway, and the power throws the coal rock to the roadway and makes a violent sound. The induced mine earthquake is a kind of disaster. It not only causes damage to shafts, casualties, and damage to buildings on the ground, but also causes gas and coal dust explosions and floods, interferes with the ventilation system, and seriously threatens the production safety of coal mines. Due to the divers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 陆菜平刘广建张农刘洋左源耀
Owner CHINA UNIV OF MINING & TECH
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