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Effect of stress direction on the undrained monotonic and cyclic behavior of dense sands

Jafarzadeh, F ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.24200/SCI.2018.20318
  3. Publisher: Sharif University of Technology , 2021
  4. Abstract:
  5. Geotechnical design may be unsafe if the anisotropic behavior of soil is not considered. The behavior of anisotropic materials depends on the principal stresses and their directions. A detailed experimental programme was conducted to study the e ect of stress direction on the monotonic and cyclic behavior of dense sand. A total of 20 undrained tests were performed at a constant mean con ning stress (00m), a constant intermediate principal stress ratio (b = (2 - 3)=(1 -3)), and principal stress directions (). Two ne sands, Babolsar and Toyoura, were selected as the test materials. The isotropically consolidated specimens were prepared by the wet tamping technique. The results showed that the major principal stress direction had inconsiderable e ect on the mobilized friction angle at steady state or phase transformation. The results showed that stress direction had a signi cant e ect on the non-coaxiality between the principal strain increment direction and the principal stress direction. The soil fabric resulted in a signi cant non-coaxiality value before the peak shear strength. Increasing the octahedral shear strains decreased the non-coaxiality value due to the destruction of the soil particle interlock (soil fabric). The e ect of stress direction on non-coaxiality and excess pore water pressure generation was also investigated. © 2020 Sharif University of Technology. All rights reserved
  6. Keywords:
  7. Anisotropy ; Soils ; Strain ; Anisotropic behaviors ; Anisotropic material ; Excess pore water pressure ; Geotechnical designs ; Intermediate principal stress ; Major principal stress ; Monotonic and cyclic behavior ; Principal strain increment direction ; Shear strength ; Cyclic loading ; Geotechnical property ; Porewater ; Sand ; Soil mechanics
  8. Source: Scientia Iranica ; Volume 27, Issue 2 , 2021 , Pages 551-565 ; 10263098 (ISSN)
  9. URL: http://scientiairanica.sharif.edu/article_20318.html