Discussion on the technology of waterproof and drain of the subsea tunnel——in case of Xiamen Xiang'an subsea tunnel

Because of the specificity of subsea tunnel,the waterproof and drainage technology has distinct difference with the general land tunnels.This paper introduces the scheme design on waterproof and drain of Xiamen-Xiang'an subsea tunnel with an evaluation on the effect of the scheme.It concludes that the waterproof and drainage technology of the subsea tunnel should adopt the principle of leak stoppage and combine the self-waterproof function of rock mass and supports.The author believes that the inject grout behind the primary lining is important,and the materials of inject grout should be improved.The technology of waterproof and drain is a core problem relates to the success or defeat of the subsea tunnel construction.