Research on Construction Technology of Three-Guided Tunnels+Main Tunnel Covering Method for Long-Span Double-Arch Tunnels in Complicated Urban Environment
Based on the large span double arch tunnel under the main road of Xiamen Second West Passage(Haicang Tunnel)project,the construction technology of three guide tunnel method+main tunnel cover method is summarized.It provides technical support for the construc-tion of ultra-shallow buried,biased pressure,weak surrounding rock and large-span double-arch tunnel.At the same time,the key construc-tion technology of three guide hole method+main hole cover method is adopted to ensure the stable settlement control during the excavation of the positive hole,and provide a strong technical guarantee for the safe and rapid penetration of the tunnel.
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