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Stiff Degradation of Granular Material – A DEM Approach

  • Md. Mizanur RahmanEmail author
  • Hoang Bao Khoi Nguyen
  • Hung-Chun Wang
Conference paper
Part of the Sustainable Civil Infrastructures book series (SUCI)

Abstract

The stiffness degradation of granular materials such as soils due to cyclic loading has been widely explored in the experimental studies, mostly in triaxial or oedometer apparatus. Such behaviour can be observed due to the cyclic loading at very small strains, which is considered as elastic range. While increasing the cyclic strain amplitude, the stiffness or secant shear modulus (G) reduces non-linearly and forms a S-shaped curve with the shear strain (γ). A discrete element method (DEM) is adopted in this study to have enhance the understanding of soil response to cyclic strain amplitude. It was found later in this study that the stiffness of granular material reduced as void ratio (e) increased. The maximum stiffness was highly dependent on e, but not p′. However, the normalized stiffness degradation curve was influenced by both initial states i.e. e and p′; p′ seemingly had more impact of the normalized stiffness degradation than e.

References

  1. Been, K., Jefferies, M.G.: A state parameter for sands. Géotechnique 35(2), 99–112 (1985)CrossRefGoogle Scholar
  2. Cundall, P.A., Strack, O.D.: A discrete numerical model for granular assemblies. Geotechnique 29(1), 47–65 (1979)CrossRefGoogle Scholar
  3. Goudarzy, M., Rahemi, N., Rahman, M.M., Schanz, T.: Predicting the maximum shear modulus of sands containing nonplastic fines. J. Geotech. Geoenviron. Eng. 143(9), 06017013 (2017)CrossRefGoogle Scholar
  4. Goudarzy, M., Rahman, M.M., König, D., Schanz, T.: Influence of non-plastic fines content on maximum shear modulus of granular materials. Soils Found. 56(6), 973–983 (2016)CrossRefGoogle Scholar
  5. Gu, X., Yang, J., Huang, M.: DEM simulations of the small strain stiffness of granular soils: effect of stress ratio. Granular Matter 15(3), 287–298 (2013)CrossRefGoogle Scholar
  6. Hardin, B.O., Richart Jr., F.: Elastic wave velocities in granular soils. J. Soil Mech. Found. Div, 89(Proc. Paper 3407) (1963)Google Scholar
  7. Huang, X., O’Sullivan, C., Hanley, K., Kwok, C.: Discrete-element method analysis of the state parameter. Geotechnique 64(12), 954–965 (2014)CrossRefGoogle Scholar
  8. Idriss, I.M., Dobry, R., Sing, R.: Nonlinear behavior of soft clays during cyclic loading. J. Geotech. Geoenviron. Eng. 104(ASCE 14265) (1978)Google Scholar
  9. Nguyen, H.B.K., Rahman, M.M.: The role of micro-mechanics on the consolidation history of granular materials. Aust. Geomech. 52(3), 27–36 (2017)Google Scholar
  10. Nguyen, H.B.K., Rahman, M.M., Cameron, D.A., Fourie, A.B.: The effect of consolidation path on undrained behaviour of sand - a DEM approach. In: Computer Methods and Recent Advances in Geomechanics, pp. 175–180. CRC Press (2015)Google Scholar
  11. Nguyen, H.B.K., Rahman, M.M., Fourie, A.B.: Characteristic behaviour of drained and undrained triaxial tests: a DEM study. J. Geotech. Geoenviron. Eng. 144(9), 04018060 (2018a)CrossRefGoogle Scholar
  12. Nguyen, H.C., O’Sullivan, C., Otsubo, M.: Discrete element method analysis of small-strain stiffness under anisotropic stress states. Géotechnique Lett. 8(3), 183–189 (2018b)CrossRefGoogle Scholar
  13. Rahman, M.M., Cubrinovski, M., Lo, S.R.: Initial shear modulus of sandy soils and equivalent granular void ratio. Geomech. Geoengin. 7(3), 219–226 (2012)CrossRefGoogle Scholar
  14. Rahman, M.M., Nguyen, H.B.K., Rabbi, A.T.M.Z.: The effect of consolidation on undrained behaviour of granular materials: a comparative study between experiment and DEM simulation. Geotech. Res. 5(4), 199–217 (2018)CrossRefGoogle Scholar
  15. Vucetic, M., Dobry, R.: Degradation of marine clays under cyclic loading. J. Geotech. Eng. 114(2), 133–149 (1988)CrossRefGoogle Scholar
  16. Yang, J., Dai, B.: Is the quasi-steady state a real behaviour? A micromechanical perspective. Géotechnique 61, 175 (2011)Google Scholar
  17. Yang, J., Gu, X.: Shear stiffness of granular material at small strains: does it depend on grain size? Géotechnique 63(2), 165 (2013)CrossRefGoogle Scholar
  18. Zhao, J., Guo, N.: Unique critical state characteristics in granular media considering fabric anisotropy. Géotechnique 63(8), 695–704 (2013)CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Md. Mizanur Rahman
    • 1
    Email author
  • Hoang Bao Khoi Nguyen
    • 2
  • Hung-Chun Wang
    • 2
  1. 1.Water and Natural Resources Natural and Built Environments Research Centre (NBERC) and Geotechnical Engineering, School of Natural and Built EnvironmentsUniversity of South AustraliaAdelaideAustralia
  2. 2.School of Natural and Built EnvironmentsUniversity of South AustraliaAdelaideAustralia

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