小净距并行隧道围岩稳定的分析方法及应用

Rock stability analysis method of close-parallel tunnels and application

高等级公路、双线铁路、城市地铁及城市轻轨隧道一般情况下均为左、右双线.近年来,为满足规划、平面线型要求,或受地形、地物、水文、地质等条件限制,或对原交通设施进行加宽扩容,或为提高土地利用率,小净距并行隧道呈迅速增加态势.由于各种施工方法围岩受力差别很大,笔者仅探讨采用矿山法或新奥法施工的暗埋隧道.笔者介绍了其相应的围岩稳定分析方法以及在重庆市轻轨二号线设计中的应用.

It has generally two ways for high-class highways,two-way railways,urban underground,and urban light track tunnels. In recent years,the application of close-parallel tunnels have increased rapidly because of the need of planning and plane design,the constraint of terrain,surface construction,hydrology,and geology,the expansion of existed transport facilities,and the improvement of land utilizing efficiency. For the great diversity of around-rocks pressure with different construction methods,we focus our discussion on hidden-burying tunnels by Mine method or NATM. The corresponding rock stability analysis method is introduced in this article,and its application in Light Track #2 of Chongqing City is also provided.