割煤高度对综放采场顶煤回收率及矿压的影响
Effect of Coal Cutting Height on Top Coal Recovery Ratio and Mine Pressure of Fully-mechanized Sublevel Caving Face
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摘要: 采用数值模拟、相似模拟和理论分析相结合的方法，研究了割煤高度对综放采场顶煤回收率及矿压的影响。结果表明：增加割煤高度，可以增大通风断面、缩短放煤时间，有利于提高顶煤回收率。但是，随着割煤高度的增大，顶板活动高度、支承压力影响范围随之增大，煤壁片帮、冒顶等现象出现的几率也会增加，工作面对支架的参数及性能要求将更高。因此，为了保证特厚煤层综放采场安全回采，割煤高度不能一味的增加，应根据具体煤层赋存条件以及目前煤机装备水平来确定合理的割煤高度。Abstract: Based on numerical simulation, analogy simulation and theoretical analysis, the effect of coal cutting height on the laws of recovery rate and mine pressure of fully-mechanized sublevel caving face is studied. The results show that increasing coal cutting height could increase ventilation section and shorten the coal caving time, which is helpful for improving the top coal recovery ratio. However, with the increasing of coal cutting height, roof activity height and influence scope of abutment pressure would increase; the phenomenon such as rib spalling and roof fall would appear in all higher probability; the working face would need higher-level of hydraulic support parameters and properties. Therefore, in order to keep the safety of special thick seam fully mechanized mining, coal cutting height can not be increased blindly. The reasonable coal cutting height should be determined according to the concrete conditions of coal seam occurrence.
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