隧道锚碇围岩稳定分析及破坏模式研究  

The stability and failure mode study on the tunnel-anchorage rock masses

作　　者：胡波[1] 曾钱帮[1] 彭运动[2] 刘波[2] 赵海滨[3] 

机构地区：[1]中国科学院工程地质力学重点实验室,北京100029 [2]中交公路规划设计院,北京100010 [3]中国水电工程顾问集团公司中南勘测设计研究院,长沙410014

出　　处：《中国科学院研究生院学报》2008年第4期487-492,共6页Journal of the Graduate School of the Chinese Academy of Sciences

基　　金：国家重点基础研究规划(973)项目(2002CB412702);交通部科技教育司项目(200531800019)资助

摘　　要：锚碇围岩稳定性及破坏模式研究是确定系统极限承载力的基础.基于现场地质资料的数值仿真计算与现场缩尺模型试验对比分析,被认为是一种比较理想的研究思路.通过FLAC3D计算发现,在设计荷载下,围岩的应力场和位移场具有明显的分区特征,在锚体空腔和结构拐角处常出现应力集中和大变形区,系统整体未形成连贯的破坏区,出现的局部破损区主要集中在锚体后部右上角等5个部位.超载数值试验发现,破坏并不是简单的沿锚体和岩体的边界发生滑移,而是带动周边岩体发生倒塞型的整体拉剪复合破坏.现场模型试验结果与数值计算结果吻合较好.施工及运营过程中应对易破坏区进行重点加固处理.The study on stability and failure mode of anchorage rock masses is the foundation of the ultimate bearing capacity evaluation. The integrations of numerical simulation and in situ scale model test are believed to be an effective and convenient method to achieve our study purpose. As an example, this method is carried out in stability and failure mode analysis of Balinghe super bridge. According to the FLAC3D numerical analysis, the stress field and displacement field show subsection characters under designed load. There are some stress concentration and excessive displacement zones at the corners of the structure and the upper part of the hollow anchorage room. There is no coherent plastic zone in the anchorage-rock mass system. Some partial failure zones mainly appear in five areas including the upper-right of the anchorage. According to the overload test, the failure does not simply happen on the boundary of the anchorage and rock masses, but holding the surrounding rock appears as plug style tensile-shear complex failure. The numerical calculated results coincide well with the in-situ scale model test. The plastic and prominent deformation zones in the rock mass should have more attention during design and construction.

关 键 词：隧道锚碇 稳定性 破坏模式 缩尺模型试验 

分 类 号：P554[天文地球—构造地质学]