Abstract
The effect of subsurface liquefaction on the seismic behavior of partially saturated soil was discussed. The effective stress analysis with unsaturated seepage was presented and verified based on the results of unsaturated seepage experiment. The one dimensional analyses of the liquefied ground during the 1995 Hyogoken-Nanbu earthquake was performed. We discussed the effect of the unsaturated seepage characteristics, permeability and input motion on the generation of excess pore water pressure in partially saturated soil. The numerical results showed that the seepage to partially saturated soil caused the delayed dissipation of excess pore water pressure in the subsurface liquefied soil, and liquefaction of surface partially saturated soil with increase in the degree of saturation.
