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| Study on the mechanism of mining rock burst in working face under the condition of special-shaped coal pillar |
| Luo Yonggang, Yan Liheng, Bian Ge, He Junjiang, Lu Caiping |
| Shaanxi Changwuting South Coal Industry Co., Ltd., Xianyang 713602, China |
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Abstract The No.4 coal seam of Tingnan Mine has strong impact risk after identification and evaluation. In view of the problems of high impact risk and difficult treatment due to the influence of advanced stress, ' square ' large goaf and roadway group during mining, through the research on the treatment technology of rock burst in working face under the condition of strong impact coal seam and special-shaped coal pillar, with the help of fracture mechanics, damage mechanics, catastrophe theory and time-dependent damage model, the mechanical model of dynamic and static load superposition instability of various coal pillars under the condition of hard roof was established, and the disturbance effect of hard roof fracture instability on the dynamic instability of special-shaped coal pillar under the influence of mining was analyzed. Targeted treatment measures were formulated by region, step and grade to reduce the risk of rock burst and continuously optimize the pressure relief scheme, improved the pressure relief effect and ensured the safe mining of the working face.
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