特厚煤层刀把工作面里切眼巷道支护研究

Support of Inside Cut Roadway in Knife Handle Face of Extra Thick Coal Seam

结合韩家洼煤矿22401特厚煤层不等长综放工作面工程地质背景,综合运用钻孔应力监测、原位钻孔窥视和巷道表面位移监测的方法,对不等长工作面引起的巷道围岩失稳问题进行了实践研究。监测结果表明,工作面超前支承压力影响范围为93 m,应力峰值和位置分别为9.5 MPa、距工作面前方10 m处;里切眼顶板和两帮塑性区分别为3.2 m,1.1 m和0.3 m,表明锚杆已经失效;增加短锚索后,巷道围岩基本保持稳定,保证了长短工作面安全对接。

Combined with the engineering geological background of 22401 unequal length fully mechanized top coal caving face in the extra thick coal seam in Hanjiawa Coal Mine,this paper made a practical study on the instability of roadway surrounding rock caused by unequal length working face by comprehensively using the methods of borehole stress monitoring,in-situ borehole peeping and roadway surface displacement monitoring.The monitoring results show that the influence range of the advance bearing pressure of the working face was 93 m,the peak value and position of the stress were 9.5 MPa and 10 m from the front of the working face;the plastic zones of the roof and two sides of the inner cut hole were 3.2 m,1.1 m and 0.3 m respectively,indicating that the anchor rod had failed;after adding short anchor cables,the surrounding rock of the roadway was basically stable to ensure the safe docking of long and short working faces.