seyed Amirodin Sadrnehad - Associate prot. In Dept. of civil Eng. K,N Toosi University of tech

A constitutive model based on the multi-yield plasticity concept is developed to accurately reproduce the characteristics of soil liquefaction. This cyclic elastic-plastic multi-plane based model for both cohesive and non-cohesive soils is developed and used to compute and present the influence of rotation of principal stress axes, induced anisotropy, softening effects, pre-failure history of plastic strain distribution and failure orientation on plastic behavior of soil. this is fulfilled by distributing the effects of boundary condition changed into several predefined sampling orientations at one point and summing up the micro-results as the macro-result.