Comparative analysis of three methods in shield segment design and onsite monitoring analysis

At present, according to different mechanic process modes of segment joint in calculation process and different hypotheses of joint stiffness, internal force transfer of longitudinal bolt and loading distribution form, segment lining design of shield tunnel is mainly divided into three methods: the modified routine method, the multi-hinge ring method and the beam-spring method, among them, the modified routine method is also divided into analytic method and numerical simulation method. Based on the local measurement results of segment internal force in Dongguan to Huizhou city railway transit projects DK97+898.238-DK100+897 part, the analytical solution of the modified routine method, the solution of the multihinge ring method and the beamspring method are compared in this paper, the rationality and accuracy of different calculation methods are obtained, and the conclusions are drawn that segment internal force and reinforcement of the modified routine method analytical solution are the biggest, those of numerical solution take the second place, solution of the beamspring method and field measured calculated value are minimum. Analytical solution is partial conservative, easy to cause the oversize reinforcement and waste. Beamspring method and onsite monitoring may feedback design. The results show that, compared with the analytical solution, numerical solution is closer to the engineering practice, saving 22.6% of reinforcement in this project, while it still have margin. Due to simple and fast calculation processes and economic and reasonable calculation results, the numerical solution of the modified routine method can be widely adopted.