Reasonable Spacing Optimization of New Overlapping Tunnels Under Existing Tunnels

With the advancement of urbanization, underground space resources are becoming increasingly tense, and the excavation of overlapping tunnels under existing tunnels has become the norm. The determination of the optimal spacing of new overlapping tunnels under existing tunnels has become a key problem in the planning of crossing tunnels. Based on the finite element analysis software ABAQUS, this paper uses Python language to carry out parametric design of different spacing of new overlapping tunnels under existing tunnels. The penalty function and Neider—Mead algorithm are used to optimize the analysis. The surface settlement, the convergence of the existing tunnel roof and floor, the maximum bending moment and the bearing force of the lining are taken as the optimization target values. The parametric model is calculated and the optimal spacing is proposed. The research method has certain reference significance for similar projects.