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针对偏薄中厚煤层亟待开采的现状,采用理论分析和数值模拟的方法对偏薄中厚煤层综采工作面的覆岩运移规律及应力分布特征进行研究,结合现场实测分析了工作面顶板的来压特征和支架工阻,得出了工作面矿压显现的一般规律.研究结果表明:工作面自开切眼开始向前推移,塑性区破坏范围以“O”型圈的形式向四周延展,影响区域不断扩大;岩层运移和应力分布经历了初始、发展和稳定的动态过程,覆岩移动受时空因素影响显著,支承压力与顶板破断具有同步效应;从能量场的角度揭示了能量释放与应力集中是导致煤矿动压灾害的根源.研究结论为相同煤层条件下的采场矿压观测和顶板监控提供理论指导.
In view of the urgent need of mining in the thin and medium thickness coal seam, the law of overlying strata migration and stress distribution in the fully mechanized coal mining face in the thin and medium thick seam are studied by theoretical analysis and numerical simulation. The pressure characteristics of the roof of the working face are analyzed with field measurement The result shows that the working face moves forward from the open cut and the damage range of the plastic zone extends to the periphery in the form of “O” ring, The influence area is expanding constantly. The migration and stress distribution of rock strata undergone initial, development and steady dynamic process. The movement of overlying strata is affected by spatiotemporal factors. The supporting pressure has synchronous effect with the roof breaking. From the perspective of energy field, Stress concentration is the root cause of dynamic pressure disasters in coal mines.The conclusions of the study provide theoretical guidance for rock pressure monitoring and roof monitoring in the same coal seam conditions.