厚硬顶板多煤层开采煤柱型冲击显现机制研究
Study on Mechanism of rock burst behavior induced by coal pillar in multi-coal seam mining with hard- thick roof strata
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摘要: 为了对厚硬顶板条件下煤柱型冲击显现机制进行研究,本文采用理论分析、数值模拟、现场监测等手段,研究了厚硬顶板多煤层开采条件下的覆岩运移特征,分析了工作面冲击显现机制并讨论了后续开采过程中潜在冲击危险性。结果表明:受区段煤柱、厚硬顶板及超前支承压力影响,工作面中下部区域及区段煤柱附近围岩应力及支架压力明显大于上顺槽区域,容易产生煤柱型、厚硬顶板垮落型冲击地压;当工作面接近上覆“刀把形”采空区边界时,上覆I010405采空区边界应力可以向下传递至I010203工作面,与侧向及超前压力相互叠加,构成支承应力,从而造成I010203工作面冲击危险性进一步增大,应在此阶段加大防治力度以顺利度过危险区。现场监测的冲击危险性与理论分析结果一致。研究结果可为相似条件的矿井工作面冲击地压防治提供借鉴。Abstract: In this paper, order to comprehensively study the mechanism of rock burst induced by coal pillar under the condition of hard-thick roof strata, using numerical simulation and on-site data monitoring, the characteristics of overlying rock movement in the process of fully mechanized top coal caving mining under the condition of hard-thick roof strata was studied, the mechanism of rock burst behavior in the working face was analyzed, and the potential risk of rock burst in the subsequent mining process was analyzed. The results show as follows: Influenced by the coal pillar, hard-thick roof strata and the ahead supporter pressure, the stress of surrounding rock and supporter pressure in the middle and lower part of the working face and near the coal pillar in the section are obviously greater than that of the upper roadway area, which is easy to produce the ruck burst induced by coal pillar and hard-thick roof strata; when the workface is close to the boundary of "knife-shape-like" gob, the boundary stress of the I010405 gob can be transferred down to I010203 workface and stacked with lateral and advanced supporter stress. Finally, the three supporter stress formed, which would cause rock burst hazard of I010203 workface to increase. At this stage, more efforts should be made to prevent the impact of the I010203 workface to pass through the dangerous area smoothly. The rock burst of the field monitoring is consistent with the theoretical analysis results. The research results can provide reference for the prevention and control of rock burst in similar conditions.
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Key words:
- microseismic event /
- supporter pressure /
- coal pillar /
- rock burst behavior /
- knife-shape-like gob
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