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Volume 33 Issue 9
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SUN De-an, CHEN Li-wen. Bifurcation analysis of over-consolidated clays under different stress paths[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(9): 1313-1319.
Citation: SUN De-an, CHEN Li-wen. Bifurcation analysis of over-consolidated clays under different stress paths[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(9): 1313-1319.
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Bifurcation analysis of over-consolidated clays under different stress paths

  • (1. Department of Civil Engineering, Shanghai University, Shanghai 200072, China; 2.Shanghai No.1 Construction Co., LTD., Shanghai 200120, China)

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  • Published Date: September 14, 2011
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    • Abstract
  • Based on the Hvorslev’s envelope-based three-dimensional elastoplastic constitutive model proposed by Yao et al. for over-consolidated clays, an acoustic tensor and a discriminator of bifurcation for strain localization under undrained conditions are given in an explicit form. The analytical and numerical solutions to the model under different stress paths are resolved. The theoretical analysis shows that onset of bifurcation occurs in the hardening regime at the Lode angle in the range of - 23.5o ~ 4o when the material is single-phase. There is no bifurcation occurring at the Lode angle in the ranges of - 30o~23.5o and 4o~ 30o. On the other hand, onset of bifurcation occurs in the softening regime at the Lode angle in the range of - 23o ~ - 1o when the material is two-phase consisting of soil skeleton and water, and there is no bifurcation occurring at the Lode angle in the ranges of - 30o~23o and - 1o~ 30o. The numerical simulations of cubic specimens of the single-phase and water-soil coupling saturated porous media under undrained condition for the bifurcation are carried out by use of a nonlinear finite element analysis software ABAQUS with the above model being implemented. A comparison indicates that the numerical results agree with the theoretical solutions.
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    • References (19)
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