软岩隧道不同开挖方法施工位移响应分析  

Analysis of Displacement Response during Construction of Soft Rock Mass Tunnel by different Excavation Method

作　　者：黄锋[1] 朱合华[2] 

机构地区：[1]重庆交通大学土木建筑学院,重庆市400074 [2]同济大学地下建筑与工程系,上海市200092

出　　处：《公路》2013年第10期227-231,共5页Highway

基　　金：国家自然科学基金资助项目;项目编号40672184

摘　　要：以旦架哨三车道浅埋软岩隧道为例,采用有限元法对全断面法、台阶法和CD法开挖的施工过程进行了三维数值模拟,分析了地表、横断面和纵断面上的位移响应规律。研究表明:三种方法施工围岩位移的响应规律基本是类似的,CD法施工产生的位移值相对较小;隧道地表变形近似为槽形,且主要由邻近段开挖引起;竖向变形主要分布在拱顶附近,且主要由当前段开挖引起;掌子面空间效应的影响范围约2倍洞径,该范围外围岩沉降变形基本趋于稳定。The Danjiashao Tunnel is a typical three-lane shallow structure in soft rock mass. Using fi- nite element method （FEM）, the construction process of tunnel is simulated, which includes entire section method, benching method, and CD method. The displacement response of surface, cross section and pro- file are studied. The results show that. （1） the rules of displacement variation for different excavation method are similar, and the value by CD method is least~ （2） the surface settlement is approximately chan- nel shaped which is mainly formed by the excavation of neighboring segment （3） the vertical strain is mainly located near tunnel crown and caused by excavation of the current part; and （4） the constraint of tunnel face has impact on the surrounding rock mass within approximately 2 times of span, beyond which the displacement will become constant.

关 键 词：软岩隧道 开挖方法 围岩位移 数值模拟 分析 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]