Numerical simulations on the seismic stability of rock foundations under critical facilities via dynamic nonlinear analysis

摘要

Evaluation of seismic stability of critical facilities to earthquake-induced failure of rock foundations based on ground displacement is considered to be crucial. In this study, a constitutive model was developed to consider the effects of both shear and tensile failure of rock on the stress-strain relation derived from the multiple shear spring model. This model was then used for dynamic nonlinear analysis that considers progressive failure. The applicability of this analysis method to a dynamic centrifugal model test of a rock foundation was evaluated. The amounts of residual displacements of the analysis results were comparatively close to the model test results although the vibration step, which begins after the occurrence of residual displacements, was slightly faster than that of the model test.