隧道围岩与支护结构间的相互作用  

Interaction between Tunnel Surrounding Rock and Support

作　　者：李之达[1] 吴延贞[1] 赵刚 黄强[1,3] 刘劲勇 

机构地区：[1]武汉理工大学交通学院,湖北武汉430063 [2]武汉市市政建设集团,湖北武汉430063 [3]洛阳理工学院土木工程系,河南洛阳471003 [4]江西省交通设计院,江西南昌330002

出　　处：《湘潭大学自然科学学报》2010年第4期40-45,共6页Natural Science Journal of Xiangtan University

基　　金：国家自然科学基金项目(51072149;10372074)

摘　　要：结合某高速公路隧道施工,利用黏弹性理论,对隧道-初期支护与二次衬砌之间的相互作用进行了研究,并对载荷释放与围岩-支护结构受力进行了计算分析.首先,利用线性黏弹性理论,导出了圆形隧道施工中隧道-初期支护和二次衬砌中应力和位移解析表达式.然后,利用变形协调条件,导出了隧道-初期支护和二次衬砌间相互作用力和释放荷载分担系数.结果表明,若将流体模型模拟围岩,二次衬砌要承担所有围岩压力,若用固体模型模拟围岩,二次衬砌只要承担部分围岩压力.最后,将围岩视为Poyting-Thomson三参数固体,二次衬砌视为弹性体,对载荷释放与围岩-支护结构的变形与受力进行了计算分析,给出了不同荷载分担比下二次衬砌的变形与受力,为隧道施工与设计提供参考.Combined with the construction of a tunnel and using viscoelastic theory,the interaction between tunnel surrounding rock -early support and second lining has been studied,and the load distribution ratio and stress in tunnel surrounding rock -early support and stress in second lining have been calculated in this paper.Firstly,the analytical expression equation of the stress and displacement in tunnel surrounding rock -early support and second lining during the process of circular tunnel construction have been derived by using linear viscoelastic theory.Secondly,the interaction between tunnel surrounding rock -early support and second lining,and load distribution ratio have been derived by compatibility of deformation.The results show if surrounding rock -early support be simulated with viscoelastic fluid then the second lining must be supported whole surrounding rock pressure,and if surrounding rock -early support be simulated with viscoelastic solid then the second lining only be supported a pat of surrounding rock pressure.Finally,the load distribution ratio,displacement and stress in tunnel surrounding rock -early support,displacement and stress in second lining have been calculated by surrounding rock -early support to be simulated with Poyting-Thomson three-parameter solid rheological model and second lining to be simulated with elastic solid,and the displacement and stress in the second lining under different load distribution ratio have been given. These can be provided a reference for the construction and design of the tunnel.

关 键 词：围岩 二次衬砌 相互作用 荷载分担系数 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]