Research and application of road tunnel structural optimization

摘要

The optimization process of road tunnel is established in this paper with an engineering example.Through numerical computation, we can find a serious stress concentration occurring at the spring of arch.To solve this problem, a tunnel section shape optimization method is established at first. In this method, thedimensions of the tunnel section are taken as the design variables, the stress of spring is taken as the objectivefunction. No augmentation of the excavated area and the satisfaction of construct boundary are taken as theconstraint condition. A Complex Method is used as the optimization method and C++ language is used toprogram and implement the optimization. Using this optimization method, the stress condition of the tunnellining can be greatly improved. Then, the optimization method for the thickness and reinforcement of the tunnellining is also established and the construction cost is reduced.