论文部分内容阅读
针对王家岭煤矿20103综放窄煤柱煤巷顶板支护过程中出现的非对称大变形控制难题,采用钻孔窥视法对基本顶断裂位置和顶板双向移动特征进行现场实测,结合顶板煤体微裂隙非对称演化过程的CT识别,提出槽钢简式桁架锚索与单体锚索平行布置非对称支护技术,并对其组成结构和控制机制进行系统研究。得出:(1)距20103掘进工作面100~300 m长度区间,基本顶在窄煤柱上方距巷道横截面铅垂中心轴2.918 m位置断裂;(2)基本顶断裂后回转下沉引起巷道顶板发生两次离层和水平错动:一次离层和水平错动导致煤柱侧顶板沿巷道长度方向区域性断裂,二次离层和水平错动诱发煤柱侧顶板局部冒漏;(3)窄煤柱煤巷顶板煤体微裂隙演化过程具有明显的不对称性:水平错动带煤体微裂隙数量、发育速度和贯通速度大于扰动稳定带煤体微裂隙数量、发育速度和贯通速度;(4)槽钢简式桁架锚索和单体锚索平行布置非对称支护机制:重点突出、刚柔并济、点线结合、均衡承载。20103窄煤柱煤巷采用槽钢简式桁架锚索和单体锚索平行布置非对称支护技术,煤柱侧顶板和回采侧顶板变形协调一致,围岩控制效果良好,研究成果对类似工程条件的巷道支护具有一定的理论意义和实用价值。
In view of the asymmetric large deformation control problem in roof support of narrow coal seam gateway in 20103 fully mechanized top coal caving mining face in Wangjialing coal mine, drilling and peephole method was used to measure the location of the basic roof fracture and the characteristics of two- The CT identification of asymmetric fracture evolution is proposed. Asymmetrical support technology of parallel arrangement of simple steel truss cable and single cable is proposed, and its structure and control mechanism are systematically studied. The results show that: (1) From the length of 100-300 m from the 20103 heading face, the basic roof is ruptured at 2.918 m above the narrow coal pillar from the vertical center axis of the roadway cross section; (2) There are two delamination and horizontal dislocation of the top plate: one time of delamination and horizontal dislocation, the side roof of the coal pillar is caused to rupture along the length of the roadway, and the secondary delamination and horizontal dislocation induce partial leakage of the roof of the coal pillar. ) The evolution process of coal bed micro-fissures in coal seam with narrow coal pillar has obvious asymmetry: the number of micro-fissures, development speed and penetration velocity of coal body in horizontal fault zone are greater than the number of micro-fissures, development speed and penetration velocity ; (4) Asymmetrical supporting mechanism for parallel arrangement of simple truss cables and single cables in channel: emphasis is placed on the rigidity, flexibility and economy, combined with point and line, and balanced bearing. 20103 The coal pillar of narrow coal pillar adopts asymmetrical support technology of parallel arrangement of channel simple steel truss cable and single cable, the deformation of roof side and back roof of coal pillar is consistent and the surrounding rock control effect is good. Conditions of roadway support has a certain theoretical significance and practical value.