极近距离煤层下位巷道变形机理及控制

Deformation mechanism and control of lower seam roadway of contiguous seams

为了解决极近距离煤层下位巷道围岩维护的难题,以山西蒲县北峪煤矿工程地质条件为背景,通过数值计算研究了极近距离上位煤层采空区下底板岩层的应力分布规律及下位煤层巷道变形破坏特征,确定了下位巷道顶板控制原则,并对不同顶板控制方式进行了现场测试;在此基础上,提出了基于水力膨胀锚杆全长锚固和顶板超前插管法的三维联合控顶技术,并依据力学计算和现场测试结果确定了关键参数。工业性试验表明,研究开发的控制技术对极近距离煤层下位巷道围岩的控制作用显著,巷道整体维护状况良好,给类似条件下的巷道围岩控制提供了有益的参考。

In order to solve the support problem of roadway locating in the lower seam of contiguous coal seams, this paper, taking Beiyu coalmine in Pu County, Shanxi Province as a case, has studied the stress field in the floor of gob belonging to upper seam and characteristics of deformation and instability for roadway locating in lower seam by means of numerical simulation. Principles of ground control for roadway roof in lower seam have been determined and different roof control methods have been tested in field. According to this research, three-dimensional combined roof control techniques based on hydraulic expansion bolt and advancing insertion of tube on roof have been put forward with corresponding key parameters being determined through theoretical analysis and field test. Field test has suggested that control techniques raised in this paper are effective for the ground control of roadway in lower seam of contiguous coal seams and the general condition of roadway is good, which has provided great reference value for ground control of roadway in similar conditions.