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A two-surface plasticity model for stiff clay

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Abstract

This paper presents a constitutive model for describing some important features of the behavior of natural stiff clay evidenced experimentally such as the limited elastic zone, the presence of strain hardening and softening, and the smooth transition from elastic behavior to a plastic one. The model, namely ACC-2, is an adapted Modified Cam Clay model with two yield surfaces: similarly to bounding surface plasticity theory, an additional yield surface—namely Inner yield surface—was adopted to account for the plastic behavior inside the conventional yield surface. A progressive plastic hardening mechanism was introduced with a combined volumetric-deviatoric hardening law associated with the Inner yield surface, enabling the plastic modulus to vary smoothly during loading paths. The main feature of the proposed model is that its constitutive equations can be simply formulated based on the consistency condition for the Inner yield surface, so that it can be efficiently implemented in a finite element code using a stress integration scheme similar to that of the Modified Cam Clay model. Furthermore, it is proved to be an appropriate model for natural stiff clay: the simulations of a set of tests along different mechanical loading paths on natural Boom Clay show good agreement with the experimental results.

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Acknowledgments

The first author gratefully acknowledges Chinese Scholarship Council for grant scholarship number: 2009609031.

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Correspondence to J. M. Pereira.

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Hong, P.Y., Pereira, J.M., Tang, A.M. et al. A two-surface plasticity model for stiff clay. Acta Geotech. 11, 871–885 (2016). https://doi.org/10.1007/s11440-015-0401-0

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  • DOI: https://doi.org/10.1007/s11440-015-0401-0

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