ABSTRACT
Cyclic and dynamic behavior of saturated sands is significantly influenced by their porosity and permeability. During loading, unloading and reloading compaction, loosening and re-compaction of sands take place, which lead to change in pore volume and permeability. In this study, the behavior of water saturated sands subjected to cyclic and dynamic loading is analyzed numerically. For the finite element analyses, a three-dimensional fully coupled two-phase finite element is developed and implemented on the basis of a two-phase model to consider the pore water pressure development in saturated sands. In addition, a hypoplastic constitutive model is used to describe the material behavior of sandy soils. The porosity-permeability variation is taken into account by Kozeny-Carman relationship. Comparing with experimental test results documented in the literature, the influence of porosity-permeability variation on the strain and pore pressure accumulation is investigated. The necessity of the consideration of porosity-permeability variation for realistic modeling of the cyclic and dynamic behavior of saturated sandy soils is assessed.
