Research Institute of Mining Technology,Taiyuan University of Technology

为了解决大采高综采工作面易发生煤壁片帮及其难以控制的问题,提出了将控制煤壁片帮的切入点放在液压支架上,通过采用理论分析和数值模拟相结合的方法研究了综采液压支架初撑力为0~5 000 k N时对煤壁稳定性的影响规律。研究结果表明:当液压支架初撑力由0增大到5 000 k N时,煤壁内破坏深度由3.0 m减小为1.5 m,垂直集中应力峰值减小24%,煤壁处顶板下沉量减小24mm,煤壁水平偏移量减小8 mm。现场实测结果显示,提高液压支架初撑力能有效减小煤壁片帮次数和片帮深度;改善煤壁受力状态,最终减小煤壁片帮发生的概率。

in order tosolve the cal al spalling easily occurred in the high cuttingfully mechanized coal mining face and the prominent problems existed in the avaliable method to control the coal wall salling a breakthrough point to control the coal all spallig would be set on the hyarauli powered suppor. Amethod combinedwith the theoretcal analysis and the nunercal stnmulation was applied to study the infuence aw ofthe coalwall tailit when the setingload ofth fuly ehanized hydraulic powered support was 0 ～ 5 0.Ok N.The study resuits showed that when the seting load of the hyaraulic powered support was increased from 0 to 5 0.0kNthe falre depth in the coal wall would be reduced from 3.0 m to 1.5 m,the verical concentrated stress peak was reduced by 24%,the roof uosidence value at thecoalwall as reduced by 24 mm and the horizontal ofist value of the coal wall was reduced by 8 m.the stie measured resutshowed that the setig load increased ofthe powered suppot could eff ctively reduce the coal all spallig times and spalling depth. The studly resulis showed that the sting load increased of the powered support could effectively reduce the failure scope of the coal wallcould improve the stress status of the coal wall and finallyalling occurred.

国家自然科学基金资助项目(51174141,51404167)；矿山灾害预防控制国家重点实验室培育基地开放基金资助项目(MDPC2013KF16)；