A Multi-directional Total Variational Regularized Tomography Method for Surrounding Rock in Coal Mine Working Face

A tomographic imaging and working face technology, applied in the field of mine geophysical detection, can solve problems such as the step effect of smooth areas, and achieve the effects of weakening the step effect, high imaging accuracy, and fast calculation speed

Active Publication Date: 2021-04-06
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

Total variation regularization has been widely used in the field of image reconstruction. The traditional isotropic or anisotropic total variation only applies the horizontal and vertical gradient information of the image. Although the edge information of the image can be well preserved, the There is a staircase effect in the smooth region

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  • A Multi-directional Total Variational Regularized Tomography Method for Surrounding Rock in Coal Mine Working Face
  • A Multi-directional Total Variational Regularized Tomography Method for Surrounding Rock in Coal Mine Working Face
  • A Multi-directional Total Variational Regularized Tomography Method for Surrounding Rock in Coal Mine Working Face

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Embodiment Construction

[0035] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are examples only for explaining the present invention and should not be construed as limiting the present invention.

[0036] The transmitted waves in the coal mine working face include refracted waves and direct waves. The schematic diagram of the ray paths of refracted waves and direct waves is shown in figure 2 As shown, the thickness of the coal seam is d, the shot point and the receiver point are placed at d / 2, the critical angle of the refracted wave is θ, when the incident angle is equal to θ, a refracted wave is generated, and the refracted wave propagates along the surrounding rock at a propagation speed of Velocity, so the tomographic imaging of the refracted wave travel time can obtain the velocity cloud map of the surrounding rock, combined with the comprehensive interpretati...

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Abstract

The invention proposes a first-arrival tomographic imaging method of transmitted seismic waves in surrounding rocks of a coal mine working face, specifically a multi-directional anisotropic full-variation regularized tomographic imaging method. It mainly includes the following steps: first, pick up the first arrival of the transmitted seismic wave; then, read the coordinates of the shot point and the receiver point to establish the transmitted wave observation system, and divide the observation area into a grid, and obtain the ray length matrix in the grid; finally , use the Split-Bregman iterative algorithm to solve the multi-directional anisotropic total variation regularization objective function, obtain the velocity cloud map in the working face, combine the revealed geological data of the working face for comprehensive interpretation, and draw the geological hazards in the working face Distribution. Compared with the algebraic iteration method and the combined iterative reconstruction method of conventional tomographic imaging methods, the present invention has the characteristics of high imaging precision, fast calculation speed, and is more suitable for actual data processing.

Description

technical field [0001] The invention relates to a first-to-multi-directional full-variation regularization tomography method of transmitted seismic waves transmitted from surrounding rocks of a coal mine working face, and belongs to the technical field of mine geophysical detection. Background technique [0002] Geological anomalies such as faults, collapse columns, and goafs in coal mine working faces will affect production efficiency and are potential hidden dangers to safe production. At present, with the development of comprehensive mechanized mining technology, it is urgent to find out the geological anomalies in the working face and its surrounding rocks. Due to the low accuracy of ground seismic exploration, there is a large gap between the requirements of safe and efficient production in coal mines. However, transmission seismic exploration in the working face can more accurately identify geological anomalies in the working face and provide geological guarantee for s...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30G01V1/36
CPCG01V1/302G01V1/36G01V2210/41
Inventor 陈波朱国维武延辉
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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