条带开采煤层间岩体应力分析

在材料力学简支梁理论基础上,建立了多煤层条带开采上下条带的煤柱完全不对齐时煤层间岩体的力学模型,分析并计算了各种地质和采矿因素(如采深、层间距、采出率等)对多煤层层间岩体稳定性的影响,研究了层间岩体应力的变化规律,并得出了层间距及下煤层采宽对保持煤层间岩体的稳定性有着重要作用的结论.最后结合峰峰矿区开采实例,预计了一定采深下,合理的下煤层采宽.

Coal-seam inter-burden stress distribution using strip-pillar mining method

Base on the simple supported beam theory in material mechanics,the relevant mechanical model is set up when the centers of the upper pillar and lower pillar are not in a vertical direction on multi-coal seam strip mining.The impact of various geologic and mining factors(such as mining depth,seam distance,extraction ratio etc.) on the stability of strata between the coal seams is calculated and analyzed,the change laws of strata stress is studied,and gained that the seam distance and the width of lower seam is important to maintain strata stability.With the example of the mining in Fengfeng mine area,the reasonable mining width of lower seam under certain mining depth is predicted.