摘要
重庆轨道一号线朝天门至小什字区间隧道根据平面线路要求,需要从已建成朝千隧道上方斜交通过。为了确保朝小区间隧道施工过程中,路面交通和朝千隧道的正常运营,设计单位提出采用连拱隧道或单洞三线隧道跨越朝千隧道的两套方案。本文用三维弹塑性有限元方法,以地表和朝千隧道变形为主要控制目标,对这两套设计方案产生的位移的影响进行预测。计算结果表明,采用连拱隧道方案优于单洞三线隧道方案,并且按照此方案设计可以确保朝小区间隧道与朝千隧道内力满足承载力要求和抗裂要求。这一结论为该工程的顺利实施提供了依据。
According to the requirement of the planar line, the tunnel of Chongqing railway No 1 line from Chao Tian Men to Xiao Shi Zi（caUed Chao-Xiao tunnel for short） needs to pass across the upside of the Chao-Qian tunnel that has been constructed before. The design institute provides two plans to make sure the effective work of the load traffic and Chao-Qian tunnel during the construction of the Chao-Xiao tunnel. One plan is to adopt the multi-arch method, and the other is the single arch. The three-dimensional elastic-plastic finite element method is used to forecast the displacement effects produced by those two plans for controlling the deformation of the ground surface and Chao-Qian Tunnel. The result demonstrates that the plan of multi-arch is superior to the plan of single arch, and the multi-arch method can satisfy the capacity and crack requirement of Chao-Xiao and Chao-Qian tunnels. This conclusion provides guidance for the successful execution of the project of Chao-Xiao tunnel.
出处
《重庆建筑》
2008年第10期5-8,共4页
Chongqing Architecture
关键词
隧道
有限元分析
设计方案
tunnel
finite element analysis
design plan
