Method for judging impact risk of high-homogeneity coal seam through window intervention method
A dangerous and interventional technology, applied in earth-moving drilling, mining equipment, mining equipment, etc., can solve the problem of difficult quantitative early warning of the danger of rockburst with hard roof type, serious pressure of roadway slices, and increased risk, etc. question
Inactive Publication Date: 2021-03-12
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology
[0003] At present, the risk prediction of this type of rock burst is basically consistent with that of the general working face, mainly including microseismic, drilling cuttings method, electromagnetic radiation, stress change, mine pressure observation, etc., which is less pertinent and less reliable
Due to the laterally hard and suspended roof structure of the working face, it will often cause a large static load when driving along the gob-side roadway, which will cause serious danger during the roadway excavation, and the dynamic fracture of the roof of the working face will be added during the mining period. sex surge
At present, the roadway retaining technology with broken roof is adopted. Although the lower rock formation is destroyed, because the upper layer still has a lateral suspended roof structure, the coal seam is subjected to the action of the whole process of the roof movement of the lateral working face, resulting in serious roadway slabs and cracking, resulting in local high stress
[0004] So far, there has not been a targeted and specific prediction method for the risk of along-channel impact for the specific coal seam conditions of the laterally hard suspended roof
Especially under the condition of high suspended roof with lateral hard roof, when the suspended roof structure undergoes large-area instability and fracture movement, it will cause large-area and high-level impact energy to be released, and the possibility of destructive rock burst will increase
When the coal seam has a strong impact tendency and the coal seam has high homogeneity, it is difficult to quantitatively warn the risk of hard roof burst with conventional monitoring techniques, and it is difficult to predict the static risk distribution caused by the suspended roof structure in advance
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[0017] The embodiment of the present invention provides a method for judging the impact risk of high homogeneity coal seam by window intervention method, including the following steps:
[0018] 1. According to the geological mining conditions of the specific working face, the rock burst risk assessment report and other data, combined with specific observation data, determine the impact risk area, see figure 1 ;
[0019] 2. Carry out window chamber construction in the impact risk area, window size: height, width, depth 2, 2, 3m, carry out blasting modification, blast hole depth 3-4m, install anchor cable head-on in the chamber, length 6m, installation measurement Dynamometer, 1 is roadway, 2 is chamber, 3 is blast hole, 4 is anchor cable (with dynamometer), see figure 2 ;
[0020] 3. Lead the observation sensor of the dynamometer out of the chamber, backfill the chamber, observe the force of the anchor cable, and judge the degree of impact risk according to the shape of the ...
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The invention discloses a method for judging the impact risk of a high-homogeneity coal seam through a window intervention method. The method comprises the following steps: 1, determining a dangerousregion: determining the dangerous region according to the specific conditions of the coal seam, impact ground pressure influence factors and an impact ground pressure risk evaluation result in combination with specific monitoring data; 2, adopting a man-made window intervention technology: because the coal seam has high homogeneity, the damage appearance of the coal seam is presented as a main shock type, a dangerous area needs to be artificially damaged, and a weak surface is manufactured to be used as a window for observing the impact risk; wherein a chamber is artificially manufactured on one side of the working face of the roadway, the height, the width and the depth of the chamber are 2 m, 2 m and 3 m respectively, blasting is conducted on the head-on side by the depth of 3-4 m, and then conventional anchor rod supporting is conducted on the chamber; Anchor cables with the depth of 5-6 m are installed on the head of the chamber, and dynamometers are installed at the outer ends ofthe anchor cables. The stress of the anchor cable is observed, and when sudden change occurs, impact danger is regarded as.
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 a high-homogeneity coal seam by a window intervention method. Background technique [0002] The overhang of the lateral hard roof formed by the mining of the working face often leads to dynamic disasters. The impact ground pressure caused by the lateral hard roof of the stope occupies a large proportion, and its dangerous area is large and its strength is generally high. Due to the irregular and extremely complex spatial structure of the lateral roof suspension, the distribution of the stress field along the channel is significantly different, and the risk of rock burst is partitioned. How to predict the risk of rock burst with lateral hard roof in the working face is a major technical problem faced by coal mines. [0003] At present, the risk prediction of this type of rock burst is basically the same as that of the genera...
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IPC IPC(8): E21F17/18E21D21/02
CPCE21F17/185E21D21/02
Inventor潘立友周脉来欧阳振华陈建强
OwnerSHANDONG UNIV OF SCI & TECH