摘要
某城市道路小净距隧道平行上穿既有地铁隧道,施工图纸显示该新建隧道的施工方法为上下短台阶法。文章运用有限元分析软件MIDAS/GTS进行数值模拟分析,比较新建隧道采用不同开挖台阶长度施工时对既有隧道的变形及内力的影响,评价既有隧道的安全性。模拟分析结果表明,新建隧道施工可以采用长台阶法开挖施工,能够保证既有隧道安全并可加快施工进度。
An urban road small-interval tunnel is parallel crossing above the existing subway tunnel,the construction drawings show that the construction method of this new tunnel is the upper and lower short-step method.Through finite element analysis software MIDAS/GTS,this article conducted the numerical simulation analysis,compared the impact of new tunnel construction by using the different excavation step length on the deformation and internal forces of existing tunnel,and evaluated the safety of existing tunnel.Simulation analysis results showed that the new tunnel construction can adopt the long step method for the excavation,which can both ensure the safety of existing tunnel and speed up the construction progress.
出处
《西部交通科技》
2016年第10期61-65,共5页
Western China Communications Science & Technology
关键词
新建隧道
既有隧道
小净距隧道
数值模拟
台阶法
New tunnel
Existing tunnels
Small-interval tunnel
Numerical simulation
Step method
