偏薄中厚煤层综采面矿压显现规律

Underground pressure behavior at fully mechanized mining face in thinner middle thick coal seam

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.

Based on the present situation of thinner middle thick coal seam to be mined, the methods of theoretical analysis and numerical simulation were used to study the movement regulation of overburden and the characteristics of stress distribution in the thinner middle thick coal seam at fully mechanized working face, combining with the field test analysis the pressure characteristics and support working resistance of the roof in working face, thus obtained the general rules of underground pressure behavior in working face. The results show that face starts from open-off cut to advance, the plastic damage zone with ＂O＂ ring form extended to the surrounding, and the affected area is increasing. The strata movement and stress distribution undergo the dynamic change process of formation, development and stability. The movement of overlying strata is significantly affected by time and space, and support pressure and roof breaking have a synchronous effect. From energy field angle it reveals the rule that energy release and stress concentration are the cause of disaster in coal mine dynamic pressure. The research conclusions provide theoretical guidance for underground pressure observation and roof control under the condition of the same coal seam.