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Effect of Major Principal Stress Direction Rotation on Cyclic Behavior of Dense Sand Using Dynamic Hollow Cylinder Aparratus

Baghban Rezvan, Sina | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43525 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jafarzadeh, Fardin
  7. Abstract:
  8. In the past years a lot of research has been done on effects of different parameters on dynamic behavior of soils. According to these studies, principal stress direction rotation and intermediate principal stress coefficient have a major effect on monotonic behavior of soils, but more studies needed for observingtheir effect on dynamic behavior of soils.
    In recent study undrained isotropic consolidated specimens of dense Babolsar sand subjected to α changes using dynamic hollow cylinder apparatus and the inner and outer cell pressure kept constant so that b was relative to α changes.
    Fisrt series of testswere done to find an appropriate value for induced cyclic deviator stress. The results of these test shows that excess pore water pressure and strains of specimens are dependent on this parameter and increasing of induced cyclic deviator stress would result in decreasing the number of cycles before specime’s failure.
    Second series of tests were done to study the effect of principal stress direction rotation and it was concluded that specimen’s strength at α=〖80〗^0 and α=〖10〗^0 was more than the other angles. Also the angle of tangent linesto (Shear stress-Mean effective stress) figures depended on the major principal stress direction rotation. Also it was concluded that decreasing rate of mean effective stress was a good parameter in evaluating the strength of specimens, and strength of soil would increase if this parameter decreases during cycles of loading.
  9. Keywords:
  10. Principal Stress Axis Rotation ; Dense Sand ; Dynamic Hollow Cylinder Apparatus

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