Geomechanics and Engineering

  • 제24권1호
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  • Pages.57-65
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  • 2021
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DEM study on effects of fabric and aspect ratio on small strain stiffness of granular soils

  • Gong, Jian (College of Civil Engineering and Architecture, Guangxi University) ;
  • Li, Liang (School of Civil Engineering, Central South University) ;
  • Zhao, Lianheng (School of Civil Engineering, Central South University) ;
  • Zou, Jinfeng (School of Civil Engineering, Central South University) ;
  • Nie, Zhihong (School of Civil Engineering, Central South University)
  • 투고 : 2019.09.11
  • 심사 : 2020.12.24
  • 발행 : 2021.01.10
⟨ 이전 논문 다음 논문 ⟩

초록

The effects of initial soil fabric and aspect ratio (AR) on the small-strain stiffness (G0) of granular soils are studied by employing discrete element method (DEM) numerical analysis. Elongated clumps composed of subspheres were adopted, and the G0 values were obtained by DEM simulations of drained triaxial tests under different densities and initial confining pressure (p0). The DEM simulations indicate that the initial soil fabric has an insignificant effect on G0. The effect of the AR on G0 is related to the initial density. Namely, for dense specimens, G0 first increases with increasing AR, reaching a plateau value when the AR ≥ 1.5. However, for loose specimens, G0 gradually increases as the AR increases. Microscopic examination reveals that G0 uniquely depends on the coordination number of the particles (CN-particle) rather than the subspheres (CN-sphere) at the particulate level for the effects of initial soil fabric and AR. Finally, Poisson's ratio ν0 is also determined by CN-particle. In addition, based on data in literature and this study, ν0 can be fitted as ν0 = 5.920(G0/(p0)1/3)-0.99, which can be used to predict ν0 of granular soils based on the measured G0.

키워드

과제정보

This research is supported by the National Natural Science Foundation of China (No. 51809292, 51478481 and 51878668), Postdoctoral Fund of Central South University (No. 205455) and Beijing Municipal Science and Technology Project: Research and Application of Design and Construction Technology of Railway Engineering Traveling the Rift Valley (No. Z181100003918005). The authors would like to express their appreciation to the financial assistance.

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