Abstract：Abstract：Research purposes：The subsea tunnel project in Taishan nuclear power station is the first subsea shield tunnel in China with external diameter 9 m through middle weathered rock, clay, sand and the interface of soil and rock. The geological and geotechnical condition in this tunnel is very complex. The main character of this project is large diameter shield tunnel, long distance construction in complex geological strata. The difficulties include tunneling construction method, longitudinal profile design, structure design, TBM selection and cutting head design, the treatment of tunneling through interface of soil and rock and boulders group. Through theory analysis and experience analogy, the safe and reasonable design scheme was demonstrated.Research conclusions：(1)The tunnel machine in this project adopt the mix-shield TBM, Shield tunneling method combines with New Austria Tunneling Method. The lining of the tunnel is combined type of universal segments lining and cast in concrete lining. It effectively solves the problem of long distance and under the sea tunneling. (2) The mix-shield cutter head design, boulders blast under the sea solves the problem of high risk and low efficiency speed of tunneling. (3)Through practice, it is demonstrated that this design can effectively solve the technical problems of subsea tunnel, and effectively control the construction risks, which can provide some references for the related projects and future channel tunnels construction.
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