ABSTRACT
As a major defect, crack has a significant effect on the mechanical behavior of shield tunnel lining. However, there is an obvious multiscale phenomenon considering the size of crack and the tunnel lining structure. A novel multiscale modelling method has been proposed in which the damaged and the undamaged zones are firstly recognized according to the pre-analysis results and then simulated at different scales. After validated by the results of segmental loading test, the multiscale simulations under different loading paths have been carried out to investigate the effect of crack evolution on the performance of lining segment. The study indicates that the proposed multiscale model can reveal random propagation of multiple cracks and stiffness degradation of the lining segment. Moreover, the stiffness of the lining segment is not only dependent on the loading path but also the cracking features.
