考虑应力释放含衬砌的深埋圆形隧道应力及变形的弹塑性解  

Elastic-Plastic Solution to the Stress and Deformation of Deep Circular Tunnel with Lining Considering Stress Release

作　　者：李鹏飞[1,2,3] 赵勇[1,3] 张顶立[1] 刘建友[1,2] 

机构地区：[1]铁道部经济规划研究院,北京100038 [2]清华大学土木工程系,北京100084 [3]北京交通大学隧道及地下工程教育部工程研究中心,北京100044

出　　处：《中国铁道科学》2013年第2期58-65,共8页China Railway Science

基　　金：铁道部科技研究开发计划项目(2009G005;2011G019-A);中国博士后科学基金资助项目(2012M510491)

摘　　要：基于厚壁圆筒受均布压力的弹塑性解,推导考虑应力释放时含衬砌的深埋圆形隧道应力及变形的弹塑性求解公式。采用推导的公式对1个工程实例进行计算,并与FLAC3D有限差分程序模拟解对比分析,验证了求解公式的正确性。研究结果表明:及时施作具有一定刚度的支护,可以降低开挖面围岩应力释放量,从而减小围岩塑性变形;受开挖面变形释放的影响,衬砌与围岩接触界面变形并不连续,不能将支护变形等价于围岩变形;在计算隧道开挖引起的围岩塑性变形时,采用非关联流动法可以更好地描述隧道开挖后岩(土)体的塑性变形特性。Based on the elastic-plastic solution of thick wall cylinder subjected to uniform pressure,the elastic-plastic analytical solution formula for the stress and deformation of deep circular tunnel with lining considering stress release was deduced.The deduced formula was applied to an engineering case,and compared with the analog solution obtained by finite difference program FLAC3D to verify the correctness of solution formula.Research results indicate that： the timely construction of support with certain stiffness can reduce the stress release of the surrounding rock on excavation face,thus can decrease the plastic deformation of surrounding rock;influenced by the deformation release of excavation face,the deformation of the contact interface between lining and surrounding rock is by no means continuous,and support deformation can not be equivalent to surrounding rock deformation;in calculating the plastic deformation of surrounding rock caused by tunnel excavation,using non-associated flow method can better describe the plastic deformation characteristics of rock（soil） mass after tunnel excavation.

关 键 词：深埋隧道 平面应变模型 应力释放 塑性区半径 变形释放 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]