Abstract
Nonlinear elastic model and elastoplastic model are two main kinds of constitutive models of soil, which are widely used in the numerical analyses of soil structure. In this study, Duncan and Chang's EB model and the generalized plasticity model proposed by Pastor, Zienkiewicz, and Chan was discussed and applied to describe the stress-strain relationship of rockfill materials. The two models were validated using the results of triaxial shear tests under different confining pressures. The comparisons between the fittings of models and test data showed that the modified generalized plasticity model is capable of simulating the mechanical behaviours of rockfill materials. The modified generalized plasticity model was implemented into a finite element code to carry out static analyses of a high earth-rockfill dam in China. Nonlinear elastic analyses were also performed with Duncan and Chang's EB model in the same program framework. The comparisons of FEM results andin situmonitoring data showed that the modified PZ-III model can give a better description of deformation of the earth-rockfill dam than Duncan and Chang’s EB model.
Highlights
The constitutive model of soil is the keystone in the finite element analyses of geotechnical structures
The comparisons of FEM results and in situ monitoring data showed that the modified PZ-III model can give a better description of deformation of the earth-rockfill dam than Duncan and Chang’s EB model
The modified PZ-III model was implemented in a finite element code which has been successfully used to analyze earth dams with Duncan and Chang’s EB model and some other constitutive models
Summary
The constitutive model of soil is the keystone in the finite element analyses of geotechnical structures. A suitable constitutive model can simulate the stress-strain relationships of soils under static or dynamic conditions. Since the establishment of Cam Clay Model, some other types of elastoplastic constitutive models have achieved great development [11,12,13,14,15,16,17,18] Among these models, the generalized plasticity model [16, 19, 20] can simulate the static and dynamic mechanical behaviors of clays and sands. The original generalized plasticity model was modified to consider the stress-strain relationships of rockfill materials, as most of previous studies focused on sands and clays. The comparison of numerical results and in situ monitoring data illustrates the advantages of modified generalized plasticity model in the simulation of earth-rockfill dams
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