Seismic Response Analysis of Complicated Soil Site Based on Saturated Porous Media

Abstract:

Based on the generalized Biot theory model of incompressible saturated porous media model, a finite element formulation for dynamic transient of fluid saturated two phase porous media is presented, the numerical simulation model directly aiming at the soil site of Hong Kong, Zhuhai and Macau long immersed tube tunnel project. The result of numerical simulation indicates that: PGA of the saturated two phase porous medium free field reduces in comparison with traditional single phase medium free field; the topography of complicated soil site has a significant influence on the peak of pore water pressure; a greater permeability coefficient of porous materials may result in a lower pore water pressure; also the magnitude of input seismic action will affect the assessment of earthquake induced site liquefaction. Therefore, the numerical simulation method based on incompressible saturated porous medium is feasible in the analysis of earthquake induced site liquefaction and the conclusion can be applied to other soil site projects.