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Adaptive unequal spacing grid division method capable of improving CT inversion resolution and efficiency

A grid division and resolution technology, which is used in measurement devices, instruments, scientific instruments, etc., can solve the problems of time-consuming calculation, inability to adjust wave speed, and reduction of wave speed inversion resolution, so as to improve accuracy and ensure inversion resolution. , the effect of the simple method

Active Publication Date: 2017-05-10
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, with this method of meshing, in order to match the dense ray distribution around the working surface, the meshing is relatively dense, so the calculation is time-consuming, and for the external area, many meshes do not have rays passing through, so it cannot be adjusted Wave velocity; if the grid spacing is increased and the number of grids is reduced, the resolution of wave velocity inversion within the mining area will be reduced

Method used

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  • Adaptive unequal spacing grid division method capable of improving CT inversion resolution and efficiency
  • Adaptive unequal spacing grid division method capable of improving CT inversion resolution and efficiency
  • Adaptive unequal spacing grid division method capable of improving CT inversion resolution and efficiency

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Embodiment 1

[0035] The main idea: First, calculate the covariance matrix C of the mine earthquake source based on the mine earthquake signals collected by the passive CT stations around the coal mining face, then find the eigenvalue λ and eigenvector P of C, and then calculate the eigenvalue λ and eigenvector P according to the eigenvalue The square distribution value s determines the standard confidence ellipsoid, and then according to the eigenvector P and the mean value of the source coordinates Carry out coordinate rotation on the standard confidence ellipsoid, and finally project the rotated confidence ellipsoid in the X, Y, and Z directions of the space model of the coal mining face. The inversion model area within the projection range adopts an encrypted equidistant grid The area outside the projection is divided into sparse grids with unequal spacing.

[0036] A coal mine 53 下 During the mining of the 02 working face, shock wave CT technology was used to detect the internal stre...

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Abstract

The invention discloses an adaptive unequal spacing grid division method capable of improving CT inversion resolution and efficiency, and belongs to the coal mining and coal mine safety technical field; the method comprises the following steps: firstly using a passive CT inversion station to collect mine quake signals, using the mine quake signal to calculate a covariance matrix C of mine quake seismic source distribution in a calculated area, and determining a standard confidence ellipsoid according to the covariance matrix C; converting coordinates of the standard confidence ellipsoid so as to obtain real space distribution of the confidence ellipsoid; using the real space distribution of the confidence ellipsoid to carry out model imaging, and projecting a confidence ellipsoid image in a coal face space model, wherein encrypted equal spacing grid division is employed on the coal face space model within the projection scope, and sparse unequal spacing grid division is employed outside the projection scope. The method can ensure the inversion resolution in a key monitoring area, and can greatly reduce the grid number; the method is simple, can improve the inversion precision in the area, can reduce the calculation complexity, and can improve the calculation efficiency.

Description

technical field [0001] The invention relates to an adaptive grid division method with unequal intervals for improving CT inversion resolution and efficiency, and belongs to the technical field of coal mining and coal mine safety. Background technique [0002] Shock wave tomography (CT) detection technology can invert the stress distribution characteristics in a large area and continuously in the region according to the mining-induced mine earthquake, and has a wide range of applications in the identification and prevention of coal mine disasters. How to divide the model grid is one of the important steps in CT inversion. At present, equidistant model grid division is a common method in CT inversion calculation. However, with this method of meshing, in order to match the dense ray distribution around the working surface, the meshing is relatively dense, so the calculation is time-consuming, and for the external area, many meshes do not have rays passing through, so it cannot...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/6242
Inventor 巩思园窦林名李静夏双王桂峰蔡武刘震
Owner CHINA UNIV OF MINING & TECH
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