Numerical Modeling and Optimizing Construction Schemes for Transition Section Complex Structure of Large Scale Underground Railway Station and Tunnel

Abstract

Based on the engineering background of New Beijing-Zhangjiakou Inter-city railway Badaling underground station and tunnel transition section construction, the problem of tri-arch and large-span variable single arch construction schemes in the transition section launched research. This paper draws some basis and the law as reference in construction process by the simulate calculation of ABAQUS finite element analysis software. This thesis discuss the frequently-used methods(middle cell method, one-side wall drift heading method, CRD-4 holes method and CRD-6 holes method) that is used in large-scale variable cross-section tunnel engineering research and analysis the stress, deformation and plastic areas distribution of surrounding rock by the simulate calculation of construction process. By comparative analysis, confirm the best construction scheme of transition section: the middle cell method applies to tri-arch cross-section and the CRD-4 holes method applies to large-span single arch of variable cross-section. It can offer direct guidance to the Badaling underground station and tunnel transition section project and some reference to similar underground projects.