霍尔辛赫3207大采高工作面上覆岩层运移数值模拟分析

摘要

In order to solve the mining problem of the soft thick coal seam with broken roof in Shanxi Huoerxinhe Mine and ensure the smooth and safe mining of 3207 working face with large mining height,numerical simulation was carried out on the influence of the advancing abutment pressure,the delayed stress state and the advance speed of 3207 working face on the coal wall spalling according to the the overlying strata movement rule and the actual conditions of this face and by using FLAC3D software,the overlying strata movement rule of this face was thus obtained.The research results showed that the peak position of the advancing abutment pressure was about 6 to 7 m away from this face and the peak position of the delayed abutment pressure was 10 to 14 m behind the coal wall of the face;when the advance speed of the face was slower,the damage area caused by the tensile stress and shear stress was larger and the probability of rib spalling increased.%为了解决霍尔辛赫煤矿松软破碎顶板厚煤层开采存在的问题,以确保3207大采高工作面的顺利安全回采,基于采煤工作面上覆岩层运移规律,结合霍尔辛赫3207大采高工作面现场实际情况,利用FLAC3D软件对3207工作面超前支承压力、工作面滞后应力状态及推进速度对煤壁片帮的影响进行了数值模拟分析,得到了3207工作面上覆岩层运移规律.研究结果表明:3207工作面超前支承压力峰值位置距离工作面6～7m,滞后支承压力峰值位于工作面煤壁后方10 ～ 14m;3207工作面推进速度越慢,煤壁拉应力破坏区和剪应力破坏区就越大,发生片帮的概率增大.