利用数值模拟手段,研究双连拱隧道采用三导洞法开挖过程中的力学性态。计算结果表明:中墙是连拱隧道的主要承载结构体;中墙底部截面的应力最大,在设计中需要加强中墙底部的抗弯强度及中墙的抗倾覆能力;最不利于隧道中墙结构受力的施工工序发生在隧道由单侧施工过渡到双侧施工时。研究成果可为类似工程的设计、施工提供参考。 By means of numerical simulation, the mechanical behavior of double-arch tunnel during excavation with three-guide tunnel method is studied. The calculation results show that the middle wall is the main bearing structure of the multi-arch tunnel. The stress of the bottom section of the middle wall is the largest. In the design, the bending strength at the bottom of the middle wall and the anti-overturning ability of the middle wall need to be strengthened. Structural stress of the construction process occurs in the transition from one-sided construction of the tunnel to the bilateral construction. The research results can provide reference for the design and construction of similar projects.