Document Type : Research Article
Department of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz, Iran
Assistant Professor, Department of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz, Iran
Dept. of Civil Engineering, Islamic Azad University, Shahrekord Branch- Lordegan Center, Shahrekord, Iran
1- Department of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz, Iran Department of Engineering and Architecture, University of Trieste, Trieste, Italy
Seismic analysis of foundations rested on saturated porous media can be performed using several methods. Some of these methods are very accurate such as boundary element method, complex finite element method and scaled boundary finite element method, and some others, such as the cone model method, are simple and practical and have appropriate and acceptable accuracy. Using the cone model method, the soil mass is modeled with incomplete cones and the propagation of waves in these cones is followed until the wave is sufficiently damped and its effect on the foundation response is becomes negligible. In this paper, the application of the cone model method has been investigated in determining the dynamic stiffness of foundations resting on different soil conditions by taking into account the effect of pore water (two-phase approach). A special attention is carried out to obtain the system of differential equations governing horizontal and torsional vibrations in a porous medium, taking into account the effect of soil dilation. Also, the effect of different parameters such as soil layer thickness, porosity, permeability coefficient has been investigated on the dynamic response of foundations under shear and torsional vibrations. The results show that the cone model formulas can provide a good level of accuracy and high computational efficiency for predicting the horizontal and torsional vibrations of foundations resting on saturated porous media.