Abstract：Research purposes: Through introducing the optimized design concept on the neighborhood tunnels in Gangding-Shipaiqiao section of Guangzhou Rail Transit Line 3 from the original design of double-，h tunnel for the variable small space section to separated tunnels, this paper focuses on the many unfavorable conditions, encountered in construction, describes the construction technique, process and support measures, and discusses the feasibility of changing the double-arch tunnel into separated tunnels and the reliability of waterproof for the purpose of providing a new design mode for design of double-arch tunnel.
Research conclusions :Monitoring and measuring data during the construction of tunnels in Gangding-Shipaiqiao section illustrates that the new design concept and construction method not only can shorten the construction period and improve the waterproof property, but also can overcome the difficulties on unsymmetrical earth press and crown settlement of tunnels compared with the original double-arch structure. It provides references to similar works in future.
2008, Vol. 25 
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