Abstract
The Kansai area has a high possibility of a huge plate-boundary-type earthquake within 30 years.If an earthquake occurs, the Osaka Gulf coast will be struck by severe liquefaction disasters. Therefore, wetried to apply LIQCA, which is often used for liquefaction analysis, to a site on the Osaka Gulf coast. The inputearthquake motion is the seismic standard spectrum I, which is commonly used in Japan. The calculation timecontinued until the excess pore water pressure dissipated. The site has an underground structure, so weinvestigated not only the liquefaction phenomenon of the ground itself but also the behavior of the undergroundstructure. The results of this analysis indicate that these soil layers of the target area become liquefied. Afterthe excess pore water pressure dissipates, the ground surface settles in the vertical direction and moves in thehorizontal direction. In addition, in the vicinity of the underground structure center, it rises in the verticaldirection and moves in the horizontal direction.
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