偏压连拱隧道施工方法数值模拟研究

结合云南元磨高速公路上的忠爱桥偏压连拱隧道的设计、施工和地质情况,对软弱围岩条件下的公路偏压连拱隧道采用左右两洞不同施工顺序时的力学响应进行了数值模拟,分析了围岩和支护结构在不同施工顺序下的地应力场、位移场,通过对比分析研究,确定了先施作深埋洞,再施作浅埋洞为公路偏压连拱隧道最优施工方案,并且二次衬砌在此条件下不仅是“安全储备”,它对隧道的稳定性有重要作用。

Numerical Analysis of Construction Method for Partial Press Double- Arch Tunnel

According to design and geological condition of Zhong Ai Qiao tunnel, which lies on the YuanJiang-MoHei Highway, using numerical method the mechanical responses of partial press double-arch tunnel under soft surrounding rock condition in different construction order are analyzed, and then the nonlinear mechanical action's stress field and displacement field are studied, ascertaining that to construct the higher underground hole first then the lower underground hole is the rational construction order of highway partial press double-arch tunnel. And the secondary lining under this condition is not only safety reserve, but also very important factor to the stability of the double arch tunnel.