Abstract
A semi-analytic solution based on three-dimensional elastodynamic was developed to investigate the longitudinal deformation of deep-buried tunnels subjected to compression P wave. The wave function expansion method and the complex function were applied to express wave fields in different regions. An elastic spring model was introduced to satisfy the imperfect interface boundary between the tunnel lining and its surrounding rock mass. Influences of wave propagation direction and imperfect interface were discussed to illustrate the seismic performance of the mountain tunnel. Numerical results showed that both the wave incidence angle and imperfect interface influenced greatly the magnitude and distribution of dynamic stress. Besides, some fundamental deformation and failure modes were obtained from the numerical analysis considering the incidence angle. Based on the modes, the longitudinal deformation and damages of tunnel subjected to the 2016 Kumamoto earthquake were analyzed.
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