浅埋煤层开采矿压显现影响因素的敏感性分析

Multiple factor sensitivity analysis of strata pressure behaviour in shallow coal seam mining

针对浅埋煤层工作面矿压显现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,分析了浅埋煤层埋深、承载关键层厚度及其层位等因素对工作面矿压显现的影响。研究表明:承载关键层厚度对浅埋煤层工作面来压步距影响最大,煤层埋深次之,承载关键层距煤层距离的影响较小;承载关键层的层位决定了工作面矿压显现的剧烈程度,承载关键层距煤层的距离L与煤层埋深H比值η<0.35时,工作面来压强烈,当η>0.35时,工作面来压强度较小。结合工作面地质生产条件,分析了浅埋煤层工作面开采时承载关键层的破断形式及工作面矿压显现特征。

Considering various factors affecting strata pressure behavior degree of shallow coal seam, theoretical analysis, numerical simulation and field measurement were adopted to analyze the influence of such factors as seam depth and thickness and location of loading key strata on the strata pressure behavior. There results have shown that the thickness of loading key strata has the greatest impact on strata pressure behavior than the seam depth; the distance from the loading key strata to coal seams has the least impact. The intensity of pressure behavior is determined by the location of loading key strata. When the ratio of distance from the loading key strata to coal seams to the depth of the coal seam, the mining face had strong strata pressure behavior, when η〉0.35 the degree was less strong. Bearing characteristics of loading key strata and mining face behavior characteristics were analyzed combined with specific geological conditions of shallow coal seam.