摘要
采用三维有限元方法,模拟研究了冻结法施工条件下修建盾构隧道与联络通道组成复杂空间结构的施工力学行为。研究结果表明:因联络通道施工,将引起交叉部管片在整体上由“轴心受压向偏心受压”转变以及沿交叉部管片上下截面“整体受拉”的严重不利受力状况;与联络通道施工前相比较,交叉部管片呈现出沿纵向内力大幅度显著增长的受力特征(最大弯矩增长了9倍之多)。因此,对交叉部管片设计,不仅要求检算其横向内力满足技术规范,还应加强对其纵向结构强度的专门设计,以确保交叉部管片安全。
The mechanical behaviour of the complicated construction of cross connection of shield tunnel and connecting aisle by freezing method in Nanjing metro No.1 line is studied by using three-dimensional finite element numerical simulation method. The research demonstrates the occurrence of the two serious disadvantageous distributions of internal forces with eccentric compression in the major part section and the whole tension in upper and lower sections of removal connection segment in the shield tunnel intersection due to connect aisle construction. Compared with the case without connecting aisle, the longitudinal internal forces in the shield tunnel intersection are obviously increased in amplitude. In particular, the maximum longitudinal bending moment is increased by 9 times. On the basis of analysis above, this paper puts emphasis on the importance of the longitudinal design of segment in tunnel intersection in order to guarantee the safety of segment lining during construction by freezing method.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第18期3211-3217,共7页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
联络通道
交叉结构
冻结法
三维有限元分析
tunneling engineering
connecting aisle
cross connection structure
freezing method
3D finite element analysis
