强度折减法分析隧道整体稳定性  

Analysis of Tunnel Stability Based on Strength Reduction Method

作　　者：安永林[1,2] 黄戡[3,2] 彭立敏[2] 彭建国[3] 丁国华[3] 

机构地区：[1]湖南科技大学湖南省普通高等学校土木工程施工过程与质量安全控制重点实验室,湖南湘潭411201 [2]中南大学土木建筑学院,湖南长沙410075 [3]湖南省交通规划勘察设计院,湖南长沙410008

出　　处：《公路交通科技》2011年第4期91-95,共5页Journal of Highway and Transportation Research and Development

基　　金：中国博士后科学基金资助项目(20090461021);湖南省研究生创新基金资助项目(3340-74236000004);湖南科技大学博士启动基金资助项目(E51095)

摘　　要：为了判断武广客运专线浏阳河隧道DIIK1563+340～DIIK1563+410地段上台阶开挖时围岩的横向稳定性,应用强度折减法原理和有限元仿真软件建立每个强度折减系数下的仿真模型,研究拱顶沉降、地表沉降、主应力和塑性区与强度折减系数的关系,并分析隧道失稳形态。结果显示隧道的稳定安全系数为2.3,破坏首先发生在隧道两侧拱脚附近,然后向拱腰发展,并向地表扩展;拱顶沉降、地表沉降、塑性区对强度折减系数较敏感。因此,隧道施工中应保证锁脚锚杆的安设质量及工字钢落脚的稳固;并考虑监测中变形容易监测而塑性区不易监测,隧道监测应以拱顶沉降或地表沉降作为隧道失稳的主要判据。In order to determine the transverse stability of surrounding rock of DIIK1563＋340~DIIK1563＋410 section of Liuyang River Tunnel in the Wuhan-Guangzhou passenger line,strength reduction method and finite element software were used to build the simulation models with different strength reduction factors.The relations between strength reduction factor and vault settlement,ground subsidence,principal stress and plastic zones were analyzed,and failure shape of the tunnel section was analyzed as well.The results show that（1） safety factor of the tunnel is 2.3,plastic zones firstly appear on both sides near the arch foot,and then extend to the hance,then to the ground surface;（2） vault settlement,surface subsidence and plastic zone are more sensitive to the strength reduction factor.Therefore,the quality of foot anchors installation and I-beam should be ensured,vault settlement or ground subsidence should be as a major criterion for instability of the tunnel for it is easier to monitor deformation than plastic zone.

关 键 词：隧道工程 强度折减法 稳定分析 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]