A New Nonlinear Stress-Strain Model for Soils at Various Strain Levels

Abstract:

Soils have nonlinear stiffness and develops irrecoverable strains even at very small strain levels. Accurate modeling of stress-strain behaviour at various strain levels is very important for predicting the deformation of soils. Some existing stress-strain models are reviewed and evaluated firstly. And then a new simple non-linear stress-strain model is proposed. Four undetermined parameters involved in the proposed model can be obtained through maximum Young’s module, deformation module, and limit deviator stress and linearity index of soils that can be measured from experiment directly or calculated by empirical formulas indirectly. The effectiveness of the proposed stress-strain model is examined by predicting stress-strain curves measured in plane-strain compression test on Toyota sand and undrained triaxial compression test on London clay. The fitting results of the proposed model are in good agreement with experimental data, which verify the effectiveness of the model.

• Periodical: Advanced Materials Research (Volumes 631-632)
• Pages: 782-788
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.631-632.782
• Online since: January 2013
• Authors: Cheng Chen, Zheng Ming Zhou
• Keywords: Elasticity, Non-Linearity, Stiffness, Strain Level, Stress-Strain Model

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