Method for detecting anisotropism P-wave of fractures of working face of mine

A technology of anisotropy and detection method, which is applied in the detection field of abnormally developed cracks in the mine working face, and achieves the effect of scientific detection method, reduction of lateral swing and strong correspondence.

Inactive Publication Date: 2015-05-20
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there are obvious defects in the use of seismic wave CT to detect the fracture development area of ​​the mine working face.

Method used

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  • Method for detecting anisotropism P-wave of fractures of working face of mine
  • Method for detecting anisotropism P-wave of fractures of working face of mine
  • Method for detecting anisotropism P-wave of fractures of working face of mine

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Embodiment 1

[0049] Embodiment 1: The anisotropic elastic P-wave detection method of the mine working face fracture comprises the following steps:

[0050] 1) First, in such as figure 1 The excitation shot point is arranged in the roadway on the side of the shot point shown, and the excitation parameters are as follows:

[0051] Location: the side of the mine working face close to the coal body to be detected;

[0052] Excitation drilling depth: 2.5m;

[0053] Exciting dose: 0.3Kg;

[0054] Drilling position: It is necessary to detect the middle of the coal body, more than 1m away from the bottom plate;

[0055] Drilling direction: along the coal seam direction;

[0056] Stimulation point spacing: 8~16m;

[0057] Detonator type: instant detonator;

[0058] Loading gun: positive charge, sealing mud to seal the whole hole.

[0059] 2) Second, in the case of figure 1 The detector point is arranged in the roadway on the side of the detector point shown, and the receiving parameters a...

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Abstract

A method for detecting anisotropism P-wave of fractures of a working face of a mine belongs to a detecting method of a fracture development abnormal area in the working face of the mine. The technical scheme of the method for detecting the P-wave is that (1) trigger points are arranged on one roadway in the working face of the mine; (2) detector groups for receiving elastic P-wave signals are arranged; (3) an original single-cannon earth shake record is obtained; (4) P-wave first break time is picked up; (5) anisotropism parameters of the roadway on one side of a cannon point are calculated; (6) the anisotropism parameters of the roadway on one side of a detection point are calculated; (7) the anisotropism parameters of a concentric transmission point connecting line are calculated; and (8) anisotropism distribution of the fractures of the working face of the mine is obtained. By means of the method, detecting precision of fracture development abnormal bodies in the working face of the mine is improved, quantification detection of development density and development directions of the fractures in the working face of the mine is possible, detection is real and reliable, a detecting method is scientific and simple, a detecting result is quantitative, visual and high in precision, and safety production requirements of the working face of the mine are fully met.

Description

technical field [0001] The invention relates to a method for detecting an abnormal area of ​​fracture development in a mine working face, in particular to a method for detecting the anisotropic elastic P wave of a mine working face. Background technique [0002] For coal-measure formations such as coal seams and coal seam roof and floor, there are natural and secondary fracture systems. For high-gas coal seams, these fractures are places for gas storage and migration channels; under certain conditions, the more developed the fractures are, the easier it is for gas outburst to occur. The situation is similar when the coal measures are rich in confined water. When the fracture system is due to secondary fractures generated during the mining process, the more developed the fracture system, the more serious the fracture of the working face will be. For high-gas mines, such fracture systems are prone to coal and gas outbursts. [0003] To solve this problem, the seismic wave C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/00G01V1/104G01V1/20
Inventor 陈同俊
Owner CHINA UNIV OF MINING & TECH
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