| dc.description.abstract | Taiwan is located at the junction of the Philippine Sea Plate and the Eurasian Plate, so earthquakes often occur. During the earthquake, soil liquefaction may occur, resulting in surface subsidence and building collapse. Therefore, this study uses the data of the centrifuge model test to analyze the seismic response of the free-field at different depths and uses the one-dimensional ground response analysis software DEEPSOIL to match the results of the dynamic test to fit the soil model and the pore water pressure generation model. Finally, the centrifuge model test and numerical simulation analysis of the seismic ground response are discussed.
The results show that when the soil layer has not liquefied, the closer the soil layer is to the surface, the more the acceleration amplitude and the peak ground acceleration will be amplified. When the soil layer is liquefied, the shear wave cannot be transmitted, resulting in the tendency of acceleration amplitude and peak ground acceleration to decrease. And as the vibration intensity increases, the predominant frequency of the identified soil layer will decrease accordingly. Using DEEPSOIL to simulate the dry sand sample through a given constant damping ratio, the numerical simulation results are most consistent with the results of the centrifuge model test. The damping ratio is not much different from the damping obtained from the resonant column test. Using DEEPSOIL to simulate saturated sand by adjusting the pore water pressure model parameters, the results of the numerical simulation and the centrifuge model test are most consistent. The excess pore water pressure excited by the numerical simulation in the shallow layer is higher than that of the centrifuge model test, while the excess pore water pressure excited by the numerical simulation in the tight sand layer is lower than the result of the centrifuge model test. | en_US |