断层回采巷道分区支护设计与围岩变形分析验证

Sectional Support Design of Fault Mining Roadway and Deformation Analysis and Verification of Surrounding Rock

贵州某矿区域内断层构造发育,对巷道的安全生产运营产生了极大威胁。为优化该矿西81101外运煤巷的支护设计,运用钻孔窥视法,对掘进期间迎头后方顶板松动破坏区分布规律进行分析。结果表明:西81101外运煤巷顶板岩性条件较好,巷道掘进期间,顶板仅出现部分裂缝破坏区,岩体未观测到较为严重的破碎区。根据巷道距离断层位置的不同,设计2种支护方式,采用实验室测试方法确定岩性参数,依托数值模拟与工程监测方法确定支护方案的可靠性。数值模拟表明,正常区支护条件下,顶底板移近量为41.2 mm,最大垂直应力为30.2 MPa;断层区支护条件下,顶底板移近量为89.1 mm,最大垂直应力为30.3 MPa。工程监测表明,断层区支护巷道的测点顶底板位移量为55~65 mm,正常区支护巷道的顶底板位移量为35~45 mm,巷道围岩可得到有效控制,表明支护方案可以保障巷道的安全生产工作。

The development of fault structure in a mine area in Guizhou province poses a great threat to the safe production and operation of the roadway.In order to optimize the support design of west 81101 coal haulage roadway in the mine,the distribution law of roof loosening failure zone behind the head during excavation is analyzed by using the borehole peeping method.The results show that the lithology condition of the roof of West 81101 coal tunnel is good.During the excavation of the tunnel,there are only some crack failure areas in the roof,and no serious fracture areas have been observed.According to the different loca-tion of the roadway from the fault,two support methods are designed,the lithology parameters are deter-mined by laboratory testing method,and the reliability of the support scheme is determined by numerical simulation and engineering monitoring method.Numerical simulation shows that under normal support con-ditions,the displacement of top and bottom is 41.2 mm and the maximum vertical stress is 30.2 MPa.Under the support condition of fault area,the displacement of top and bottom is 89.1mm,and the maximum verti-cal stress is 30.3 MPa.Engineering monitoring shows that the displacement of the roof and floor of the sup-porting roadway in fault area is 55~65 mm,and that of the supporting roadway in normal area is 35~45 mm.The surrounding rock of the roadway can be effectively controlled,which indicates that the supporting scheme can guarantee the safe production of the roadway.