CASE STUDIES OF GROUND MOTION DURING EARTHQUAKE

Abstract

The damage was observed at many ground surface in 2004 Niigataken-Chuetsu Earthquake. In order to study the mechanism of ground response during earthquake, shaking table tests and effective stress analysis were conducted on the sand-silt deposit. We carried out shaking table tests on 4 type models. The analysis model used for this study was a strain space multiple mechanism model, which takes into account the effect of principal stress axis rotation. The recorded earthquake motion at a depth of 11.5 meters was used as the input earthquake motion for the analysis. The results of shaking table tests and effective stress analysis suggested that the decrease in shear resistance due to excess pore water pressure increase in the sand deposits increased the deformation of the ground surface.