深井软岩巷道预留刚隙柔层厚度的确定及应用_李冲.pdfVIP

40 4 　　　　　　　　　　　　　　 　　　　　　　　　　　 　　Vol.40 No.4 2011 7 　　　　　　　　　Journal of China University of Mining Technology　　　　　　　　　Jul.2011 1, 2 1 3 3 李　冲 , 徐金海 , 李　明, 李　凯 (1. , 　221008; 2. , 　337055; 3. , 　221116) :针对深井软岩巷道围岩变形、破坏的特点, 提出了预留刚隙柔层的厚度就是巷道围岩出现 松 破坏前的塑性区径向位移.采用Bonaitin-Thomson 模型对分区的巷道围岩进行了力学分 析, 推导出黏弹性区、稳定塑性区的径向位移计算式, 并讨论了影响预留刚隙柔层厚度的主要因 素.结果表明:巷道围岩位移与时间有关, 且随时间的增长而增加, 并最终趋于 一稳定值.预留刚 隙柔层厚度随巷道半径和原岩应力的增大而加大, 随一次支护强度的增加而减小, 但受一次支护 强度的影响较小.曲江矿运输大巷预留刚隙柔层37 cm, 使巷道围岩充分释放变形能的同时又不 损害围岩自身的支撑能力, 二次支护后, 巷道围岩变形量较小. :深井软岩巷道;预留刚隙柔层;稳定塑性区 :TD 353 :A :1000-1964(2011)04-0505-06 Thickness determination of the reservation rigid gap and flexible layer of the deep mine roadway in soft strata and its application 1, 2 1 3 3 LI Chong , XU Jin-hai , LI Ming , LI Kai (1.State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining Technology, Xuzhou, Jiangsu 221008, China;2.Mining and Construction Department, Jiangxi Polytechnic College, Pingxiang, Jiangxi 337055, China;3.School of Mechanicals and Civil Engineering, China University of Mining Technology, Xuzhou, Jiangsu 221116, China) Abstract:The deformation and failure characteristics of rock surrounding a deep-mine roadway constructed in soft strata were used to propose that the radial displacement of the rock plastic zone, without subsequent failure, around the shaft control the thickness of the reservation rigid gap and flexible layer.A mechanical analysis of the dividing roadway was performed and the radial displacement of the visco-elastic zone w