既有连拱隧道旁新建大跨度连拱隧道开挖有限元分析

在既有隧道旁施工新建隧道时，开挖过程中需考虑对既有隧道支护安全性的影响。分析邻近既有隧道的双连拱隧道施工方法，新建隧道与既有隧道的相互影响因素，并以福建省长安连拱隧道为计算模型，详细分析新建双连拱隧道开挖过程中对围岩影响范围、塑性区、既有隧道衬砌位移及内部应力的影响，为类似隧道工程的设计、施工提供参考。

Finite Element Analysis for Excavation of New Large-span Twin-arch Tunnel Beside Existing Twin-arch Tunnel

When a new tunnel is constructed beside existing tunnel, during excavation influences on safety of supports of existing tunnel should be considered. This paper analyzes construction methods for twin-arch tunnel adjacent to existing tunnel and the factors of interaction between new tunnel and existing tunnel. With Chang＇an Twin-arch Tunnel in Fujian Province as calculation model, the paper analyzes range of influence on wall rock and influences on plastic zone, lining displacement and internal stress of existing tunnel during excavation of new twin-arch tunnel in detail so as to provide a reference for design and construction of similar tunnel projects.