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为掌握近距离下煤层开采时层间距变化对工作面的矿压影响规律,根据大柳塔煤矿活鸡兔井21306工作面矿压观测结果,对不同层间距段矿压规律进行对比分析,得出近距离下煤层开采层间距变化对矿压影响规律,并对其矿压规律的机理进行分析。结果表明,对于近距离下煤层开采,层间距>15m时,工作面矿压不受层间距变化的影响;层间距由15m减小到9m时,工作面来压步距整体上有减小趋势,来压规律性减弱,非来压期间支架工作阻力明显上升,来压持续长度减小,动压系数减小。层间关键层的厚度变化和缺失与否及层间岩层的破坏程度是决定下煤层开采时工作面的矿压显现规律的主要因素。
In order to understand the regularity of the effect of floor spacing on the pressure of working face when the coal seam is mined at close distance, according to the result of the observation of the pressure in the working face of 21306 working face of the live-chicken rabbit well in Daliuta coal mine, Under the close distance, the influence of the change of coal seam spacing on the pressure is analyzed, and the mechanism of the rock pressure is analyzed. The results show that for the lower coal seam mining, when the interval is> 15m, the ground pressure of the working face is not affected by the variation of the layer spacing; when the interval is reduced from 15m to 9m, the pressure step on the working face tends to decrease , Pressure to regularity weakened, non-pressure during the stent work significantly increased the resistance, pressure continued to reduce the length, reduced dynamic pressure coefficient. The change and absence of the thickness of the key interlayer and the failure degree of the interlayer rock are the main factors that determine the law of occurrence of the rock pressure in the working face under the coal seam mining.