基于收敛约束原理的大断面黄土隧道围岩与初支稳定性分析  

Stability analysis of surrounding rock and supports in large-span loess tunnel using the convergence-confinement method

作　　者：陈峰宾[1] 张顶立[1] 扈世民[1] 张素磊[1] 

机构地区：[1]北京交通大学隧道及地下工程试验研究中心,北京100044

出　　处：《北京交通大学学报》2011年第4期28-32,共5页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家"973"计划项目资助(2010CB732102);铁道部科技研究开发计划重大项目资助(2009G005)

摘　　要：黄土特殊的工程性质决定了黄土隧道结构的受力复杂性.大断面黄土隧道由于开挖断面大,开挖方法一般采用台阶法或交叉中隔壁法(CRD).因此,沿用传统的观测点布置方法进行测点布置和位移观测,存在一定的困难.收敛约束法应用方便,思路明确.用收敛约束法对隧道初期支护进行稳定性分析,不仅能正确地反映隧道施工中的各种力学现象和过程,还能弄清楚围岩与支护"相互作用"和"动态作用"的特点.本文基于收敛约束原理,结合现场实测数据,对兰渝高铁某大断面黄土隧道的围岩稳定性和初支的安全性进行评价,为隧道的后续施工,提供参考.The stress patterns of the loess tunnel are complex because of special engineering characteristic of loess. For the big excavation cross section, the CRD or bench method is often used under tunnel construction. The common methods of displacement monitor have some problems. The convergence- confinement method is a useful theoretical tool for stability analysis of rock mass on tunnel construc- tion. Although the method cannot accurately reflect mechanical characteristics and processes of the tunnel construction, the characteristic of interaction and dynamic effect between rock and support can be found out. Based on the field monitor data, this paper analyzed the stability of the surrounding rock and safety of initial support by convergence-confinement method. The results provide a reference for the following tunnel construction.

关 键 词：收敛约束法 围岩特征曲线 支护特征曲线 安全评价 

分 类 号：U451.1[建筑科学—桥梁与隧道工程] TU942[交通运输工程—道路与铁道工程]