近距离煤层群开采条件下的冲击危险性数值分析
Numerical Analysis of Risk Assessment About Rock Burst Under the Condition of Closed Distance Seam Group Mining
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摘要: 以某冲击地压煤矿的近距离煤层群开采为研究对象，利用FLAC3D数值分析软件，对该矿布置在M4-5煤层和M9-10煤层中回采工作面进行了数值模拟。在此基础上，分析了工作面围岩应力状态及塑性区分布，认为M4-5煤层和M9-10煤层的开采破坏了上覆岩层的完整性，对顶底板岩层造成了大范围破坏，减弱了岩层强度，降低了下部煤层开采时岩层积聚能量的能力。因此，M4-5煤层和M9-10煤层的开采起到一定的保护层开采作用。但是值得注意的是，在边界煤柱、停采线煤柱及未布置在上层采空区下方的工作面回采煤柱等区域，受高强度开采的叠加影响，使得这些区域易产生较高的集中应力，存在一定的冲击危险性。Abstract: Taking closed distance seam group mining in a rock burst coal mine as research object, the working faces in M4-5 and M9-10 coal seams were simulated by numerical analysis software FLAC3D. On the basis, the stress state and plastic zone distribution of surrounding rock was analyzed, considering that the coal seam mining destroyed the integrity of overlying rock and floor strata, weaken the intensity of rock, reduced the energy concentration during mining the lower coal seam. So the mining of M4-5 and M9-10 coal seams has a certain protective effect. But, it is worth noting that, affected by the cumulated influence of high intensity mining, the coal pillars in the areas of boundary, stop line and not arranged in the upper goaf at the bottom of the working face, formed stress concentration easily, and then caused rock burst.
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Keywords:
- rock burst /
- coal seam group /
- stress concentration /
- numerical modeling /
- protective layer
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