Study on Maintenance Technology of Shield Tunnel in Soft Ground

Shield tunnel disease, such as lining cracks, deformation and leakage, would appear in different degree under the long-term impact of nature and operation. These diseases not only endanger the security of driving, but also affect the performance of shield tunnel. Without prompt treatment, they would inevitably cause further damage, and even failure of the tunnel. For these reasons, making research on maintenance technology for shield tunnel is necessary. In this paper, the fault-tree method was applied to perform a preliminary analysis of the causes of tunnel diseases, and then, by introducing rough set theory, the causes could get further excavated. Besides, calculation models for various diseases are erected, which can calculate the impact of these diseased in a quantitative way. All of these methods above provide a basis for applying reasonable maintenance method with a clear objective, and, combined with digital technology, they are applied in Shanghai Yangtze River Tunnel.