Abstract
This study investigates the generation of excess pore pressure during sequenced earthquake motions. Such sequenced earthquake motions possibly contributed to the devastating liquefaction in coastal areas in the 2011 Tohoku Earthquake. A series of shaking table tests were performed with a model ground of a uniform sand layer constructed in a laminar box. The significance of the intensity of earthquake motions and quiet intervals between shocks are studied. The test results are compared to a numerical calculation based on the Finite Element Method. Furthermore, the applicability of a conventional intensity measure for liquefaction, i.e. shear stress ratio, is examined for sequenced earthquake motions. The analysis shows that, for a certain range of quiet intervals, pore pressure generation during aftershocks can be reasonably explained by shear stress ratio.
