Asymptotic state behaviour and its modeling for saturated sand |
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Authors: | Ting Luo YangPing Yao Jian Chu |
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Affiliation: | (1) Department of Civil Engineering, Beihang University, Beijing, 100083, China;(2) Department of Civil Engineering, Nanyang Technological University, Nanyang, Singapore |
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Abstract: | A new double hardening elasto-plastic model is proposed in this paper based on the existing unified hardening model (UH model).
By assuming that there is part coupling effect between the plastic volumetric strain and plastic shear strain, hardening parameters
consisting of a coupled and an uncoupled components are adopted in this model. A unique feature of this model is that it can
describe not only the conventional drained and undrained behaviors of soil, but also the stress-strain relationships of soil
under partially drained conditions which can be volumetric compression or dilation. Adopting the asymptotic state concept,
simple equations for estimating the limiting stress ratio under undrained or earth pressure at rest (i.e. K
0) conditions are derived. The new model is relatively simple to be adopted in practice for two reasons. First, the same soil
parameters as in Cam-clay model are used except the addition of one extra parameter, the stress ratio at the characteristic
state. Second, all the parameters can be determined using conventional triaxial compression tests.
Supported by the National Natural Science Foundation of China (Grant Nos. 10672010 and 50479001) and the National Earthquake
Science Item (Grant No. 200808076) |
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Keywords: | sand asymptotic state double hardening constitutive model partially coupled |
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