深井软岩巷道预留刚隙柔层厚度的确定及应用  

Thickness determination of the reservation rigid gap and flexible layer of the deep mine roadway in soft strata and its application

作　　者：李冲[1,2] 徐金海[1] 李明[3] 李凯[3] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室矿业工程学院,江苏徐州221008 [2]江西工业工程职业技术学院采矿与建筑工程系,江西萍乡337055 [3]中国矿业大学力学与建筑工程学院,江苏徐州221116

出　　处：《中国矿业大学学报》2011年第4期505-510,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50874104);江苏省高校科研成果产业化推进项目(JH07-023)

摘　　要：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动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.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 was calculated. A Bonaitin-Thomson model was used to predict the stability of the plastic zone and the main influencing＂factors on the reserva- tion rigid gap and flexible layer were discussed. It appears that the rock displacement around the roadway increases over time, tending to a final stable value. The reservation rigid gap and flexible layer increases with the radius of the roadway and the initial stress in the rock. It de- creases slightly as the initial strength of the support increases. The thickness of the reservation rigid gap and flexible layer of the Qujiang mine transport roadway is 37 cm. This allows the de- formation energy of the surrounding rock to be fully released without damaging the supporting,surrounding rock. The deformation in the surrounding rock is small after addition of secondary support.

关 键 词：深井软岩巷道 预留刚隙柔层 稳定塑性区 

分 类 号：TD353[矿业工程—矿井建设]