Abstract
The Shenjiamen harbour subsea tunnel in Zhoushan, Zhejiang is the first pedestrian submarine immersed tube tunnel in China. In view of the characteristics of the fine soft immersed tube tunnel with large slope, the section of the immersed tube structure was reasonably chosen, the length of the pipe was partitioned, various subsidiary structures were finely arranged, the technology and parameters of the grouting were strictly controlled, and the deformation of end corner was taken as the important control parameter for the design of fine soft pipe joint. The new design technology of final joints with the combination of thrust bearing platform and water sealing wall can ensure the construction quality of final joints, as well as reduce the risk and cost of project. In the field of tunnel engineering, a new bank protection structure that double row steel pipe pile was combined with mould bag sand cofferdam had been researched and designed. Through these key technologies, it has accumulated a wealth of design experience for submarine immersed tube tunnels, which possesses an important reference value for similar projects.
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