为了研究上覆硬厚岩层对工作面采动应力的影响作用,针对田陈煤矿7112工作面地质条件,采用数值模拟方法,研究了厚硬关键层不同赋存条件下采动应力变异特征.研究表明:随工作面的持续推进,工作面前方支承压力不断增长,但增速逐渐放缓,破断后工作面支承压力迅速降低;随厚硬关键层厚度、赋存高度的增加,厚硬关键层初次破断前工作面前方支承压力峰值逐渐减小.采用理论分析方法,计算出工作面上覆关键层破断步距,根据研究结果,精细划分了硬厚岩层影响下的7112工作面冲击危险区段,通过实施密集钻孔卸压,成功控制了冲击风险,实现7112工作面的安全生产,为该采区7112周边工作面提供了可靠技术参数.%In order to study the overburden hard rock strata affected to the mining stress of the coal mining face,according to the geological conditions of No.7112 coal mining face in Tianchen Mine,a numerical simulation method was applied to study the mining stress variance features of the thick and hard key stratum under the different deposition condition.The study showed that with the sustainable pushing forward of the coal mining face,the support pressure in front of the coal mining face would be increased continuously,but the increased speed would be slow down steadily and the support pressure of the coal mining face would be rapidly reduced after the roof broken down.With the thickness of the thick and hard stratum and the deposition height increased,before the thick and hard key stratum initially broken,the support pressure peak in front of the coal mining face would be steadily reduced.The theoretical analysis method was applied to calculate a breaking step of the overburden key stratum above the coal mining face.According to the study results,the mine pressure bump danger section of No.7112 coal mining could be divided in detail under the influences of the thick and hard rock stratum.With the implementation of the intensive borehole drillings for the pressure released,the mine pressure bump risk was successfully controlled.A safety production of No.7112 coal mining face was realized and could provide the reliable technical parameters to the coal faces around No.7112 coal mining face.
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