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Effects of intermediate principal stress parameter on cyclic behavior of sand

Jafarzadeh, F ; Sharif University of Technology

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  1. Type of Document: Article
  2. Abstract:
  3. Soils have an anisotropic response, and changing the inclination (α) and magnitude of the major principal stress will affect collapse potential and brittleness, as well as shear strength and shear stiffness. In this paper, the effect of the stress path, with changes in intermediate principal stress, on the dynamic behavior of Babolsar sand, is studied. A series of undrained monotonic and cyclic tests on loose sand with induced anisotropy were conducted by using automatic hollow cylinder apparatus. Special attention was paid to the significant role of the intermediate principal stress parameter (b) in the deformation behavior of the sand during cyclic loading. Results show that at constant α, confining stress and fabric, variation in b has a significant effect on strain amplitudes, but will not change the contractive or dilative behavior of specimens. Variation of b has a great effect on liquefaction resistance but has no effect on the mobilized friction angle at steady state. It is shown that confining stress has a significant effect on soil response (strain development, excess pore water pressure generation and shear modulus and damping ratio). Moreover, by increasing the confining stress, the effect of b value on cyclic behavior is more pronounced
  4. Keywords:
  5. Anisotropy ; Cyclic hollow cylinder apparatus ; Intermediate principal stress ; Sand ; Stress path ; Cyclic loads ; Cylinders (shapes) ; Fracture mechanics ; Shear flow ; Shear strength ; Soil liquefaction ; Deformation behavior ; Excess pore water pressure ; Hollow cylinder apparatus ; Liquefaction resistance ; Major principal stress ; Monotonic and cyclic tests ; Stress paths ; Stress analysis
  6. Source: Scientia Iranica ; Vol. 21, Issue. 5 , 2014 , pp. 1566-1576
  7. URL: http://www.scientiairanica.com/en/ManuscriptDetail?mid=258