Study on Longitudinal Stress Relaxation Effect and Reinforcement Technology of Segment Lining during Shield Docking

Shield docking technology is widely used in underwater shield tunnels. As the not perfect, instability of tunnel face and stress relaxation segment lining caused by dismantling need to be solved. Using a cross-sea project, reinforcement with steel channel process studied. The longitudinal effect after thrust unloading analyzed, theoretical solution circumferential joint opening, or without reinforcement, derived. accuracy model shell connector numerical verified comparison. Then, influence key parameters, such as range, quantity model, on discussed. results show that: (1) increase range maximum displacement opening joints decrease first then increase; (2) channel, gradually decrease, reduction rate also decreases. farther away from tail, weaker lining.