北岭隧道围岩随机块体的稳定分析

Stability Analysis of Random Key Block of Surrounding Rock of Beiling Tunnel

在北岭隧道地区,围岩裂隙比较发育,经过对岩体结构面和开挖面的随机组合,运用块体理论和赤平投影的方法,计算和分析了所切割的随机块体的几何特征、滑动特征和稳定情况.结果表明:北岭隧道围岩的稳定性较好,除断层带及附近部位外,不需要采取其它特殊的支护形式.

According to the random combination of structure plane and digging plane of the rock block,the geometry character,sliding character and stability of dissected block are computed and analysed on the base of block theory and stereoprojection method. The result indicates that the surrounding rock of Beiling Tunnel have good stability and doesn't need take special braced structure except for fault position and the place around it. Using CAD and small computer program,this method,which is simpler than vector method and numerical calculation,can easily calculate the stability of surrounding rock and guide the construction of tunnel.