硬厚岩层下开采矿压显现程度的多因素敏感性研究
Research on Multi-factor Sensitivity of Strata Pressure Behavior Degree in Hard and Thick Seams Mining
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摘要: 针对硬厚岩层下开采工作面矿压显现程度影响因素多样的情况，采用理论分析、数值模拟与现场实测相结合，建立了不同支撑条件下硬厚岩层岩体内应力表达式，分析了煤层埋深、硬厚岩层厚度及其层位等因素对矿压显现程度的影响，对硬厚岩层层位对工作面矿压显现的影响程度进行研究。研究表明：硬厚岩层的层位对浅埋煤层工作面矿压显现程度影响最大，硬厚岩层厚度次之，煤层埋深的影响较小；硬厚岩层距煤层的距离L与煤层埋深H比值λ<0.35时，工作面来压强烈，当λ>0.35时，工作面来压强度较小。Abstract: According to the situation of influencing factors variety of mine pressure behavior degree appeared at working face under the hard and thick seams, the combination of theoretical analysis, numerical simulation and field measurement, the hard thick layers of rock mass stress expression in different support conditions is set up; the influence of hard thick coal seam buried depth, thickness of strata and its horizon on the rock pressure is analyzed; the influence degree of hard thick strata horizon on the mine pressure behavior is studied. Research shows that the hard thick rock strata for the shallow buried coal seam working face behavior degree to the underground pressure has the greatest influence, followed the hard thick strata thickness, buried depth of coal seam of a smaller effect; the pressure is intense at working face when the hard thick layers of coal seam distance and the coal seam buried depth ratio λ is less than 0.35; when λ is more than 0.35, the compressive strength is small.
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