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Static Liquefaction and Instability in Granular Media Subjected to Monotonic Loading—A Micromechanical Investigation

  • J. C. Lopera Perez
  • C. Y. KwokEmail author
  • C. O’Sullivan
  • K. J. Hanley
  • X. Huang
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

Static liquefaction has caused a number of failures involving dam tailings, hydraulically placed fills and slopes. In order to understand the failure mechanisms that induce static liquefaction, the discrete element method (DEM) was used to study the behavior of a representative model of a granular sample at the micro level. Samples with different void ratios at same confining pressures were sheared under constant-volume conditions and the changes in the macro and micromechanical responses of the granular media were quantified. Characteristic states such as the instability state, quasi-steady state, phase transformation and critical state were identified in the simulations. The transitions between different characteristic states were related to micromechanical characteristics such as coordination number. Finally, the orientation of the weak contacts was seen to be dependent on the characteristic state, while the orientation of the strong contacts coincided with the major principal stress direction.

Keywords

Void Ratio Discrete Element Method Weak Contact Static Liquefaction Constant Volume Condition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

Mr Lopera would like to thank the IT Department at The University of Hong Kong for generously providing access to the high performance computer HPCPOWER2 in order to conduct the simulations presented in this work.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • J. C. Lopera Perez
    • 1
  • C. Y. Kwok
    • 1
    Email author
  • C. O’Sullivan
    • 2
  • K. J. Hanley
    • 2
  • X. Huang
    • 1
    • 2
  1. 1.Department of Civil EngineeringThe University of Hong KongPokfulamHong Kong
  2. 2.Department of Civil and Environmental EngineeringImperial College LondonLondonUK

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