Seismic response analysis of the deep saturated soil deposits in Shanghai |
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| Authors: | Yu Huang Weimin Ye Zhuchang Chen |
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| Institution: | (1) Department of Geotechnical Engineering, Tongji University, 200092 Shanghai, People’s Republic of China |
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| Abstract: | The quaternary deposits in Shanghai are horizontal soil layers of thickness up to about 280 m in the urban area with an annual
groundwater table between 0.5 and 0.7 m from the surface. The characteristics of deep saturated deposits may have important
influences upon seismic response of the ground in Shanghai. Based on the Biot theory for porous media, the water-saturated
soil deposits are modeled as a two-phase porous system consisting of solid and fluid phases, in this paper. A nonlinear constitutive
model for predicting the seismic response of the ground is developed to describe the dynamic characters of the deep-saturated
soil deposits in Shanghai. Subsequently, the seismic response of a typical site with 280 m deep soil layers, which is subjected
to four base excitations (El Centro, Taft, Sunan, and Tangshan earthquakes), is analyzed in terms of an effective stress-based
finite element method with the proposed constitutive model. Special emphasis is given to the computed results of accelerations,
excess pore-water pressures, and settlements during the seismic excitations. It has been found that the analysis can capture
fundamental aspects of the ground response and produce preliminary results for seismic assessment. |
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| Keywords: | Earthquakes Ground response Soil-pore water coupled analysis Constitutive models Finite element methods |
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