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Stope micro-seismic focus mechanism solving method based on moment tensor inversion

A source mechanism and moment tensor technology, applied in complex mathematical operations, instruments, electrical digital data processing, etc., can solve problems that cannot be quantified, and achieve convenient and accurate discrimination, accurate and intuitive results

Pending Publication Date: 2022-04-29
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

In the process of deformation and failure of coal and rock mass caused by rock burst accidents, microseismic events will occur. Therefore, through the analysis of microseismic events picked up by microseismic monitoring technology, the type of rock burst can be discriminated, such as the microseismic source positioning, microseismic main frequency characteristics, and waveform time-domain characteristics, etc., but these indicators mainly rely on experience to judge rock burst, and cannot be quantified

Method used

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  • Stope micro-seismic focus mechanism solving method based on moment tensor inversion
  • Stope micro-seismic focus mechanism solving method based on moment tensor inversion
  • Stope micro-seismic focus mechanism solving method based on moment tensor inversion

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Embodiment

[0040] The solution method of stope microseismic focal mechanism based on moment tensor inversion, the specific steps are as follows:

[0041] (1) Use the coordinates of the source location point, the coordinates of the sensor probe and the initial amplitude of the P wave to solve the moment tensor.

[0042] By integrating a microseismic event (velocity wave) collected by the microseismic vibrator on the engineering site, the displacement wave is obtained, and the initial displacement of the P wave is identified by the zero-crossing method, which is the initial amplitude of the P wave.

[0043] In the study of the mechanism of seismic source mechanics, an equivalent mechanical model is constructed to describe the equivalent force of the seismic source, and the equivalent force of the seismic source can be described by the moment tensor, and the moment tensor is related to the actual source model. The moment tensor can be decomposed into three parts: isotropic (ISO), pure doubl...

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Abstract

The invention relates to a stope micro-seismic focus mechanism solving method based on moment tensor inversion, which is used for performing program development, compiling a focus mechanism solver, and directly performing moment tensor solving by inputting P-wave initial motion amplitude, focus positioning point coordinates and sensor coordinates. And then seismic source parameters such as a seismic source fracture type, a fracture inclination angle, a crack movement direction, a fracture trend and a relative crack volume are calculated, and a moment tensor sand beach ball diagram of a seismic source mechanism is drawn, so that result visualization is realized. According to the method, calculation can be carried out under the condition of determining the seismic source positioning coordinates, the sensor position and the P-wave initial motion amplitude, the seismic source fracture type can be conveniently and accurately judged, seismic source parameter solving and seismic source mechanism beach ball drawing can be conveniently and rapidly carried out, and the solving result is accurate and visual.

Description

technical field [0001] The invention relates to a method for solving a focal mechanism, in particular to a method for solving a microseismic focal mechanism in a stope based on moment tensor inversion. Background technique [0002] As the demand for coal resources increases year by year with the development of the economy, the shallow coal resources in some areas are becoming exhausted, so the mining depth of mines also changes from shallow to deep. As the mining depth gradually increases, it means that it will face a more complex mining operation environment, and it is more likely to induce mine earthquake disasters such as rock burst, roof slippage instability, and surface subsidence in a complex environment. Among them, rock burst is a destructive mine earthquake. It is a dynamic phenomenon, which is caused by the sudden and violent destruction of the coal and rock mass around the shaft or mining face due to the elastic energy being released at the moment, often accompani...

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Application Information

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IPC IPC(8): G06F30/20G06F17/16G06F119/14
CPCG06F30/20G06F17/16G06F2119/14
Inventor 宋义敏朱晨利凌小康任何苑德顺许海亮安栋
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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