Abstract：Abstract：Research purposes： Foshan-Dongguan Intercity Railway Shiziyang Tunnel whose structure external diameter is 13.1 m is the largest railway shield tunnel in China. This project has multiple characteristics of large exradius(13.1 m), high water pressure(7.8 bar), complex geological conditions(soil and rock mix ground, cross-over 3 fracture zone and 2 underwater faults), high speed (200 km/h), a new type of shield machine (dual-mode). To ensure the safety of construction and operation in this project, the key technical issues of overall design, construction organization planning, disaster-resistance of structure and evacuation design must be solved appropriately.
Research conclusions：（1）The underwater tunnel in the mix ground should be buried in the bedrock suitablely,The rock cover thickness of underwater tunnel can be determined, with the principle of "Working chamber should satisfy the security criteria, and the sum of relaxation of surrounding rock and deformation pressure is relatively small". （2）The tunnel with double tracks can be adopted if the tunnel is not very long, and evacuation corridor can be set up over the tunnel floor, to implement simultaneous construction, the intermediate box culvert can be precast. （3）In order to reduce the local rock fracture zone effect upon construction, Dual-mode can be used in shield tunneling. （4）To enhance the capability of disaster-resistance of structure, adding steel fiber and polypropylene fiber to reinforced concrete lining segment is a kind of feasible scheme. （5）The research results can be used in the design of underwater shield tunnel in mix ground.
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