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Granular Matter

, 21:39 | Cite as

Distinct element analysis of the microstructure evolution in granular soils under cyclic loading

  • Mingjing JiangEmail author
  • An Zhang
  • Tao Li
Original Paper
  • 133 Downloads

Abstract

Granular soils exhibit very complex macroscopic mechanical responses when subjected to cyclic loading. To enhance the understanding of the cyclic behaviors of granular soils and provide significant insights into the constitutive modelling, this paper investigates the microstructure and its evolution under cyclic loading using distinct element method (DEM). A series of cyclic triaxial tests in drained conditions were numerically carried out on the DEM specimens with two different initial relative densities. At particle scale, both the coordination number and contact fabric were investigated to study the microstructure evolution of the granular soils. The simulations indicate that the evolutions of coordination number and contact fabric are highly dependent on the relative density and cyclic mode. A threshold value for the fabric anisotropy exists under cyclic loading, and once the threshold is reached, the internal structure of the specimen tends to be unstable, and the critical coordination number is reached at the specimen failure. The contact normal fabric tensor is always coaxial with the stress tensor under cyclic loading regardless of the sand relative density and cyclic model. Although there is no unique relationship between the contact normal fabric and stress, a uniqueness relationship between strong contact fabric and stress can be observed.

Keywords

Granular soils Cyclic loading Distinct element method Coordination number Fabric evolution 

Notes

Acknowledgements

The research has been funded by the National Natural Science Foundation of China (Grant No. 51639008 and No. 51890911), Key innovation team program of innovation talents promotion plan by Most of China (No. 2016RA4059) and State Key Lab. of Disaster Reduction in Civil Engineering (Grant No. SLDRCE14-A-04), which supports are greatly appreciated. The support provided by China Scholarship Council (CSC) during a vist of ‘An Zhang’ to UC DAVIS is also acknowledged.

Compliance with ethical standards

Conflict of interest

We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory for Disaster Reduction in Civil EngineeringTongji UniversityShanghaiChina
  2. 2.Key Laboratory of Geotechnical and Underground Engineering of Ministry of EducationTongji UniversityShanghaiChina
  3. 3.Department of Geotechnical Engineering, College of Civil EngineeringTongji UniversityShanghaiChina
  4. 4.Department of Civil EngineeringTianjin UniversityTianjinChina

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