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Geomechanics and Engineering
  Volume 7, Number 3, September 2014 , pages 317-333

Mechanical response of rockfills in a simulated true triaxial test: A combined FDEM study
Gang Ma, Xiao-Lin Chang, Wei Zhou and Tang-Tat Ng

    The study of the mechanical behavior of rockfill materials under three-dimensional loading conditions is a current research focus area. This paper presents a microscale numerical study of rockfill deformation and strength characteristics using the Combined Finite-Discrete Element Method (FDEM). Two features unique to this study are the consideration of irregular particle shapes and particle crushability. A polydisperse assembly of irregular polyhedra was prepared to reproduce the mechanical behavior of rockfill materials subjected to axial compression at a constant mean stress for a range of intermediate principal stress ratios in the interval [0, 1]. The simulation results, including the stress-strain characteristics, relationship between principal strains, and principal deviator strains are discussed. The stress-dilatancy behavior is described using a linear dilatancy equation with its material constants varying with the intermediate principal stress ratio. The failure surface in the principal stress space and its traces in the deviatoric and meridian plane are also presented. The modified Lade-Duncan criterion most closely describes the stress points at failure.
Key Words
    rockfill; microscale modeling; combined FDEM; stress anisotropy; dilatancy; failure envelope
(1) Gang Ma, Xiao-Lin Chang, Wei Zhou, Tang-Tat Ng:
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, China;
(2) Tang-Tat Ng:
Civil Engineering Department, University of New Mexico, Albuquerque, NM 87131, USA.

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