Unified Three-Dimensional Revision of Modified Cam Clay Model


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According to unified strength parameters obtained from unified strength theory, the slope of critical state line is modified to reflect critical states of different geomaterials under general stress states. Yield function that can consider the effect of the third deviatoricic invariant is proposed, and an elasto-plastic constitutive model is established by adopting non-associated flow rules; furthermore, methods of overcoming singular points on the yield surface are discussed. The proposed model is verified by true triaxial tests of clay, and results show that the model can well predict stress-strain relationships.



Key Engineering Materials (Volumes 340-341)

Edited by:

N. Ohno and T. Uehara




H. Z. Li et al., "Unified Three-Dimensional Revision of Modified Cam Clay Model", Key Engineering Materials, Vols. 340-341, pp. 1267-1272, 2007

Online since:

June 2007




[1] Rosoce, K. H., Schofield, A. N., and Wroth, C. P. On the yielding of soils. Geotechnique, 8 (1958), p.259.

[2] Rosoce, K. H., Burland, J. B. On the generalized stress-strain behavior of wet clay. Eng. Plasticity, (1968), p.535.

[3] Yin, Z. and Zhao H. Effect of middle principal stress on constitutive relationship. Journal of Hohai University, Vol. 18 (1990), p.54.

[4] Zienkiewicz, O. C., and Pande, G. N. Some useful forms of istropic yield surface for soil and rock mechanics. Finite elements in geomechanics, (1977), p.179.

[5] Randolph, M. F. Generalizing the cam clay models. Symp. On the Implementation of Critical State Soil Mech. in F.E. Computations, (1978), p.1.

[6] Yao, Y. P. and Sun, D, A. Application of lade's criterion to cam clay model. Journal of Engineering Mechanics, Vol 126 (2000), p.112.

[7] Yu, M. H. Twin Shear Theory and Application. Beijing Science press, (1998).

[8] Li H. Z., Liao, H. J., Deng, G. Z., and Su, L. J. Twin shear unified damage constitutive for soft rock. Recent Development of Geotechnical Engineering in Soft Ground, (2005), p.224.

[9] Yu, M. H., Yang, S. Y., Fan, S. C., and Ma, G. W. Unified elasto- plastic associated and nonassociated model and its engineering application. Computers and Structures, Vol. 71 (1999), p.627.

DOI: https://doi.org/10.1016/s0045-7949(98)00306-x

[10] Lade, P. V., and Musante, H. M. Three-dimensional behavior of remolded clay. Journal of geotechnical and energy division, ASCE, Vol. 104 (1978), pp.193-209.