Investigating the Numerical Modelling of the Construction Excavation of an Actual Super Shallow Large-Span Tunnel

Abstract

Owing to the complexity of structural characteristics, it is difficult to accurately model the super shallow large-span tunnel. In this study, aiming at an actual tunnel, we investigate the refined modelling of super shallow large-span tunnel. First, the three-dimension finite element model of this actual tunnel is established considering the disturbance of the surrounding rock, construction sequence and the change of stress state of structure during the construction process. Second, with the generated finite element model, the variation rules of the crown displacement and the initial lining stress are analysed numerically. Finally, the results of the numerical simulation are compared with the measured. The results show that the established model can simulate the construction excavation accurately.