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Experimental study of stress anisotropy and noncoaxiality of dense sand subjected to monotonic and cyclic loading

Zamanian, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.trgeo.2020.100331
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. The noncoaxiality of the principal stress direction and plastic principal strain increment has been broadly recognized as an influencing parameter for design of soil structures. Here we performed a series of systematic hollow cylinder experiments to study the effects of stress anisotropy on the noncoaxiality of dense Babolsar and Toyoura sands. A total of 25 undrained torsional shear tests were carried out under constant mean confining pressure, and fixed principal stress directions, α. We investigated the stress-strain behavior of dense sands for different α-directions, and cyclic stress ratio, CSR, under monotonic and cyclic loading conditions. The results show that the noncoaxiality value depends on the CSR, the level of plastic strain, and α-direction. Independent of the principal stress direction, maximum noncoaxiality value was observed at peak shear strength when there is most interlock between sand particles. Minimum noncoaxiality was recorded in α = 45° tests, in which the direction of maximum shear stress coincided with the horizontal bedding plane direction (weakest plane). © 2020 Elsevier Ltd
  6. Keywords:
  7. Direction of major principal stress ; Direction of strain increment ; Noncoaxiality ; Torsional shear test ; Bedding plane ; Cyclic loading ; Experimental study ; Sand ; Shear stress ; Shear test ; Soil mechanics ; Strain analysis ; Stress field ; Torsion
  8. Source: Transportation Geotechnics ; Volume 23 , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S2214391219302168