【摘要】 采用数值方法,对深埋连拱隧道在Ⅱ、Ⅲ、Ⅳ级围岩条件下整体式直中墙、分离式直中墙的施工受力进行分析,得出了中墙的基本受力规律及中墙施工的关键工序和薄弱部位。结果表明,对于Ⅱ级围岩深埋连拱隧道,两种中墙结构只需构造配筋即可满足要求;而对于Ⅲ、Ⅳ级围岩深埋连拱隧道,则需根据内力配置钢筋。更多还原

【Abstract】 Adopting numerical method,authors of the paper analyzed the behavior of the single intermediate wall and the separated intermediate walls of a deep multi-arch tunnel when excavated in the rocks of grade Ⅱ,III and Ⅳ respectively.As a result,they found out the crucial construction processes and the weak points for the intermediate walls.As indicated by the analyses,the two types of intermediate walls of a multi-arch tunnel should only be reinforced by construction requirements for rock grade II,but should be reinforced according to internal forces for rocks grade Ⅲ and Ⅳ.更多还原