APPLICATION OF NEW BOUNDING SURFACE PLASTICITY MODEL FOR CYCLIC LOADING OF SATUARTED SANDS
Cyclic response of geomaterials is complex due to the pressure and specific volume dependency of the stress-stain relationship and the highly nonlinear behavior of the soil. This is particularly the case under undrained conditions in granular soils, where repeated loading and unloading can lead to a substantial rise in the pore water pressure and a sudden loss in the shear strength and the stiffness of the soil. Concerted efforts have been made to develop some plasticity models to predict non-linear behavior of soils. Conventional plasticity models such as Cam clay always assume a fixed shape of yield surface with a purely elastic interior domain, associative flow rule and using isotropic hardening rule for the evolution of the yield surface. These attributes lead to conceptually simple, non-rigorous and computationally efficient models. Cam clay model has some weakness, such as overestimating peak strength of over-consolidated clays and dense sands and unable to predict the static liquefaction failure observed in undrained loading of loose sands. Assumption of a purely elastic domain inside the yield surface limits the ability of these models to predict plastic deformations during unloading and subsequent reloading stages of a cyclic loading, which can leato dynamic liquefaction in loose sand. This research is aime o use bounding surface plasticity model to predict non-linear behavior of saturated soil subjected to dynamic loading. This method is computationally simple, uses fewer model parameters and results of the simulation fit experimental data with reasonable accuracy.
saturated sands cyclic Loading constitutive equation bounding surface plasticity
M.Maleki S.H.Hashemolhosseini A.M.Halabian
Grad.Student,Faculty of Civil Engineering,Isfahan University of Technology,Isfahan,Iran Associate Professor,Faculty of Mining,Isfahan University of Technology,Isfahan,Iran Assistant Professor,Faculty of Civil Engineering,Isfahan University of Technology,Isfahan,Iran
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）