高应力软岩巷道支护失效机制及控制研究

 为明确高应力软岩巷道支护失效机制并验证新型支护形式的有效性，以赵楼煤矿千米深井为工程背景，在围岩变形破坏及支护失效规律现场探测、监测分析基础上，采用数值计算方法，通过对FLAC3D中BEAM单元的修正处理实现了拱架支护体系的精细化模拟，讨论了支护强度等级(拱架形式)、地应力等级、围岩强度等级三个因素对巷道围岩变形量、塑性区范围、支护构件受力状态等的影响规律。在此基础上分析了高应力软岩巷道支护失效机制。对于高应力软岩巷道来说，锚网喷支护具有明显的局限性；具有一定刚度和强度的拱架是一种行之有效的围岩控制途径，是必要的。采用方形钢管约束混凝土拱架支护体系进行现场试验，新型高强拱架支护方式使得巷道围岩稳定性得到有效控制。

FAILURE MECHANISM OF HIGH STRESS SOFT ROCK ROADWAY SUPPORT AND ITS CONTROL

To find out the support failure mechanism of high stress soft rock roadway，Zhaolou coal mine is took as engineering background，and based on the detecting，monitoring and analysis of deformation and support failure law，the numerical experimental is carried out. By amending of BEAM element in FLAC3D，the arch support is simulated effectively. The influence of the support strength，stress grade and surrounding rock strength grade to roadway stability(deformation，plastic zone，stress state of support elements) is discussed. The failure mechanism of bearing structure of soft rock roadway at great depth is analyzed in terms of the limitation of anchor net spray support and the necessity of high rigidity and high strength support. Surrounding rock bearing structure is hard to form or is easy to failure while the radial supporting strength is not enough；arch center with certain rigidity and strength is very useful and necessary. Field test is carried out with square confined concrete arch support scheme，this new high strength support system has great effect on surrounding rock stability control.