Taiyuan University of Technology Guodian Tongxin Mine Company Ltd., Datong Coal Mine Group

为了掌握塔山煤矿3-5号煤层综放面煤柱应力分布及巷道变形规律,在深入调研目前煤柱压力显现情况的基础上,通过在2个综采放顶煤工作面回风巷布置应力观测区,在测区内安装GYW25型钻孔应力传感器和KJ216-F2本安型监测分站,动态监测煤柱内应力变化,同时进行了巷道围岩变形观测。观测分析结果表明:在8208工作面回采期间,煤柱应力波动较大,峰值位置位于距8210工作面一侧25 m,距8208工作面一侧13 m附近;在留设38 m区段煤柱的情况下,8208工作面前方100 m范围内回风巷顶底板累计移近量达到1 000~1 400 mm,两帮达到600~1 000 mm;在回采与掘巷相向施工条件下,38 m煤柱是安全的、合理的;从8210工作面回风巷煤柱应力峰值位置分析,可以将煤柱减小到30~35 m。

In order to know the coal-pillarOs stress distribution and the roadway0s deformation law of No.3-5 seam fully mechanized top coal caving faces, model GYW25 borehole stress sensors and model KJ216-F2 intrinsically safe type monitoring stations were embedded into two surveyed areas which were selected in tailentr y of the fully mechanized top coal caving face based on an investigation of the coal-pillarDs stress behavior condition. Dynamic monitoring data of the coal-pillarOs stre ss and the roadway0s deformation showed that the pillar Os stress fluctuation was acute, and the peak data located in an area which was 25 m away from 8210 mining face and 13 m away to 8208 face. In the case of a 38-meter-wide coalpillar, the roof to bottom cumulative convergence of an area within the range of 100 m in front of 8208 mining face was 1 000 ~ 1 400 mm, value between two sides was 600 ~ 1 000 mm, which indicated that the coal-pillar with a width of 38 m was safe and reasonab le under the condition of relative construction between mining and driving. And further analysis of the position of the stress distribution peak suggested that the width of the coal-pillar could be compressed to a range of 30 m to 35 m.