Method for judging three-hard coal seam impact risk by window intervention method

A technology of risk and intervention method, which is applied in the direction of testing material strength, strength characteristics, and instruments using one-time impact force, and can solve problems such as difficult quantitative early warning of impact risk of three hard coal seams, difficult to predict static risk distribution of suspended roof structures, etc.

Pending Publication Date: 2021-03-19
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

It is difficult to quantitatively pre-warn the impact risk of the three-hard coal seam with the conventional monitoring technology o

Method used

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  • Method for judging three-hard coal seam impact risk by window intervention method
  • Method for judging three-hard coal seam impact risk by window intervention method
  • Method for judging three-hard coal seam impact risk by window intervention method

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Embodiment Construction

[0017] An embodiment of the present invention provides a method for predicting rock burst induced by a laterally hard roof of a working face, including the following steps:

[0018] 1. According to the geological mining conditions of the specific working face of the three-hard coal seam, the evaluation report on the risk of rock burst and other data, combined with specific observation data, determine the risk area of ​​impact, see figure 1 ;

[0019] 2. Carry out window drilling construction in the impact dangerous area. The diameter of the drilling hole is 115mm, the spacing is 0.8-1.2m, and the depth is 8-10m. A test drilling hole with a diameter of 42mm is drilled between the 2 drilling holes, and the depth is slightly smaller than that of the large diameter drilling hole. 1 is the large diameter hole, 2 is the test hole, see figure 2 ;

[0020] 3. Install the pressure-bearing borehole stress gauge sensor at the bottom of the hole, observe the stress change, convert it i...

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Abstract

The invention discloses a method for judging the impact risk of a three-hard coal seam by a window intervention method. The method comprises the following steps of: 1, determining a dangerous area, namely determining the dangerous area according to specific conditions of a coal seam, impact ground pressure influence factors and impact ground pressure risk evaluation results in combination with specific monitoring data; 2, carrying out a man-made window intervention technology, namely for a three-hard coal seam stope, drilling two large-diameter drill holes in the coal seam side by side at theinterval of 1-2 m, and then drilling a small-diameter (42 mm) drill hole in the middles of the drill holes, wherein the large-diameter drill holes serve as part of an intervention window, and the small-diameter drill hole serves as a monitoring hole; and 3, judging the impact risk by the brittle deformation of the coal seam in the window, namely observing an active pressure-bearing borehole stressmeter mounted in the drill hole, and judging that the drill hole is dangerous when the drill hole deformation exceeds the brittle deformation limit displacement according to the pre-tested brittle deformation failure limit size of the coal pillar test piece with the same size as the drill hole.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and specifically relates to a method for judging the impact risk of three-hard coal seams through a window intervention method. Background technique [0002] The rockburst caused by the hard roof of the stope occupies a large proportion, and its dangerous area is also large, and its strength is generally high. If the coal seam, roof, and floor are all hard rock formations (three hard coal seams), the impact risk will increase sharply, which is one of the most difficult impact disasters to prevent and control. This type of rock burst is mainly caused by the release of energy caused by the compression of the coal mass driven by the fracture movement of the roof. The biggest feature of the three-hard coal seam is the obvious brittle failure. , the coal seam is clamped. If the coal seam has high strength and high homogeneity, the shock type is mainly the main shock type, and the risk prediction...

Claims

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Application Information

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IPC IPC(8): G01N3/30
CPCG01N3/30G01N2203/001G01N2203/0075
Inventor 潘立友陈建强周脉来毕强陈理强
Owner SHANDONG UNIV OF SCI & TECH
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