ABSTRACT
Seismic vibrations of the underground cavern type disposal facility during construction and operation phase were evaluated by considering the influence of ground motion on engineered barriers such as concrete pit, low diffusion layer and buffer. Two-dimensional FEM seismic response analyses with three different earthquake ground motions were carried out. The results indicated the cementitious materials (i.e., concrete pit and low diffusion layer) could withstand large earthquake motions, while the soil-based buffer would have some shear failure with small residual displacement after the earthquake. Even such failure, its influence on the permeability of the buffer was negligible because the increase of the permeability coefficient of the buffer was estimated to be small.
