ABSTRACT
Two cases of centrifuge tests with base shaking were conducted to study the effect of soil permeability on liquefaction due to a long duration seismic excitation. It was confirmed that reduced permeability increases liquefaction extent and elongates the dissipation duration of the excess pore water pressure. Numerical simulations using an effective stress FE method were also conducted, and the same tendencies were observed. Through a series of parametric numerical studies using different permeability, it was predicted that gravelly ground might not liquefy with the same input motion and the dissipation duration of liquefied non-plastic silty ground could be more than 24 hours.
