Structure failure and rehabilitation technologies of the cable tunnel

The urban underground municipal tunnels such as cable tunnel and underground pipeline are usually affected complex load conditions and working environment, and are also highly susceptible to human engineering activities, and thus problems or even failures occur during their design life. Although such failures, not only have caused huge casualties and property losses but also aroused great social attention, the structural failure and rehabilitation method of the cable tunnel have been rarely studied at present. This paper mainly focused on the failure of the cable tunnel's main structure. The damage form and hazard area of the failure are studied based on the numerical study, case investigation, and reference to structural characteristics of the underground pipelines. The results showed that most of the structural damage was concentrated in the hazard area of the failure. Moreover, different structural rehabilitation technologies were compared and analyzed in terms of the scope of application, cost, and the effect of rehabilitation, and the trenchless spraying rehabilitation method was found to have good applicability and workability, and it was safe and efficient. Therefore, references could be provided for solving the problems that might happen in the cable tunnel structure in China by combining the research on relevant structural failure and rehabilitation methods.