连拱隧道跨度大 ,施工过程中由于各工序互相干扰 ,结构受力复杂 ,合理选择施工方案和开挖方法能明显降低临时支护成本 ,确保隧道结构在施工及运营期间的安全。 The multi-arch tunnel has a large span. During the construction process, due to the mutual interference of various processes, the structure is subject to complicated forces. The rational selection of construction schemes and excavation methods can significantly reduce the temporary support costs and ensure the safety of the tunnel structures during construction and operation.