Stope advanced broken roof rock burst prevention and control method
A technology of impacting ground pressure and crushing roof, applied in underground chambers, mining equipment, earth-moving drilling and other directions, can solve the problem of unsuitable impact prevention in dynamic pressure crushing area, repeated damage to roof, and dynamic pressure crushing roof is difficult to achieve completely. prevention and other issues
Pending Publication Date: 2021-03-12
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology
Conventional methods are difficult to completely prevent the roof from being broken by dynamic pressure, and repeated blasting and repeated support are likely to damage the roof many times, resulting in stress concentration and energy release
Conventional technology is not suitable for the impact prevention and control of the dynamic pressure crushing area, and it is difficult to protect the construction personnel
Method used
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[0016] The embodiment of the present invention provides a method for prevention and control of ground pressure impact of advanced broken roof in stope, which includes the following steps:
[0017] 1. According to the geological mining conditions of the broken roof stope, the rock burst risk assessment report and other data, combined with the specific rock pressure observation data, determine the impact risk area, see figure 1 ;
[0018] 2. Expand the sides and dig the bottom of the roadway in the impact dangerous area, set up woven bags at intervals in advance, install continuous brackets in the roadway, and arrange the brackets front and back. 1 is a flexible body, and 2 is a bracket. See figure 2 .
[0019] 3. Continuously observe the pressure changes of the support under static and dynamic loads, and combine the dynamic performance to take blasting relief for the pressure mutation area. 3 is the pressure relief zone, see image 3 .
[0020] The basic principles and main...
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The invention discloses a stope advanced broken roof rock burst prevention and control method. The method comprises the following steps of, 1, determining a fatalness area, specifically, determining the fatalness area according to specific conditions of a coal seam roof, rock burst influence factors and rock burst fatalness evaluation results in combination with specific mine pressure monitoring data; 2, presetting flexible bodies and supports, specifically, for a roadway with a broken roof, roadway side expansion is carried out in a fatalness area, then the flexible bodies are supported on the two sides at intervals, and the supports are continuously preset in the roadway; and the supports are arranged back and forth, and the broken roof needs to be protected by wood; and 3, carrying outlocal pressure relief, specifically, the pressure condition of the supports is continuously observed, and local pressure relief is carried out on the area when the pressure of the plurality of adjacent supports suddenly changes.
Description
technical field [0001] The invention belongs to the technical field of coal mine mining, in particular to a method for preventing and controlling rockburst of an advanced broken roof in a stope. Background technique [0002] Roof and rockburst accidents caused by coal seam mining are major disasters. With the increase of mining depth and the application of high mining height mining technology, roof breakage often occurs during the mining process, resulting in local or large-scale roof fall and power ejection accidents, not only Affect production and cause serious safety hazards. With the increase of mining depth, the coal seam has the risk of impact, which will lead to serious roof dynamic pressure disasters. Due to the defects of difficult operation and difficult control of dynamic hazards under the condition of broken roof, the downtime of equipment is long, the roof fall is difficult to deal with, and secondary damage is induced. This disaster leads to a vicious cycle of...
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Patent Timeline
Login to View More IPC IPC(8): E21D9/01E21D11/00E21D11/02E21D9/00
CPCE21D9/01E21D11/00E21D11/02E21D9/001
Inventor潘立友周脉来欧阳振华毕强陈理强
OwnerSHANDONG UNIV OF SCI & TECH