A novel approach for universal segments typesetting of curved shield tunnel using an intelligent algorithm
Guodong Jiang, Guozhu Zhang, Tao Xu, Limin Gao
Abstract
Selection of segment assembly points for a curved shield tunnel is often based on the experiences gained from previous projects. This paper proposes a novel approach for the universal segments typesetting using an intelligent algorithm. It considers the curve fitting principle of the universal segment, the segment ring width and wedge amount, the radius of tunnel, the length and curvature radius of the designed tunnel route etc. A calculation method of the three-dimensional deviation between the formed tunnel axis and the designed is proposed. The intelligence algorithm based on particle swarm optimization (PSO) is used to select the optimal solution for the minimum deviation value. The algorithm is validated through a curved shield tunnel project in Xuzhou, China, which plays a role in both the optimization of segment ring point selection and axial deviation correction in shield tunnels. It is shown that, using the algorithm, the deviation value is limited within 85 mm compared to 345 mm under construction. The average deviation value in the 90 m left turn curved section of the project is reduced by 135 mm. The average of the three selected curves reduces their respective average deviations by 79.8 mm. Moreover, in the last curved tunnel section, the deviation is reduced from 377.83 mm in the first ring to 79.75 mm in the end ring.