应用荷载释放系数法模拟黄土隧道施工  

Simulation of loess tunnel construction with unloading coefficient approach

作　　者：朱彦鹏[1] 柴江[1] 邵继新 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]甘肃建材科研设计院,甘肃兰州730050

出　　处：《兰州理工大学学报》2011年第5期108-111,共4页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(50978129)

摘　　要：针对新奥法施工的黄土隧道,应用大型通用有限元软件ANSYS模拟黄土隧道开挖支护的施工过程,采用荷载释放系数控制围岩的荷载释放,分析隧道施工对围岩及支护结构力学特性的影响.分析结果与工程实测结果的对比表明:采用荷载释放系数法能较为合理地模拟黄土隧道施工过程,得出围岩和支护结构连续受力变形的情况;建议在隧道施工过程中加强拱顶和拱脚处的支护结构,尽早闭合仰拱.Aimed at the loess tunnels constructed with new Austrian tunneling method,the process of excavation and supporting of the loess tunnel was simulated with the general finite element software ANSYS.The influences of the construction on the mechanical characteristics of the surrounding rock and lining structure was analyzed by means of controlling of unloading process with unloading coefficient method.Comparing the analysis data and the measured data,it would be shown that the use of unloading coefficient approach could result in a better and reasonable simulation of the construction process of loess tunnels,so that the variation of deformation of the structures and surrounding rock would be obtained.It was suggested that the supporting structure at arch vault and arch foot should be enhanced to close the inverts as early as possible.

关 键 词：新奥法 隧道开挖 荷载释放 变形 

分 类 号：TU432[建筑科学—岩土工程] U451[建筑科学—土工工程]