Study on the durability and service life for Shenjiamen subsea immersed tube tunnel

The durability of subsea tunnel faces severe trial under complex service environment. In this paper, the tunnel's medial and lateral sides are analyzed using different models. The medial side is divided into general atmospheric environment and marine atmospheric environment with different models. A carbonation model considering construction defects is established for the former one and another considering the effect of carbonation on chloride diffusion is for marine atmospheric environment. These models are used to predict the service life of Shenjiamen subsea immersed tube tunnel. The results show that compressive strength, water-cement ratio and cover thickness greatly influence the service life of tunnel. Recommended value of these parameters are given and compared with the durability guide.