The particulate interface model for discrete element method

Chia Chi Chiu, M. C. Weng

Research output: Contribution to conferencePaperpeer-review


This research proposed a numerical joint model based on discrete element method, which is the particulate interface model (PIM). The characteristic of the PIM is able to simulate joint mechanical behavior exactly with corresponding input parameters under random particle arrangement specimen in discrete element method, which indicates the simulation result is undisturbed by size of particles. The algorithms of PIM contain a user-defined model sandwiched between a prefix subroutine and a suffix subroutine. PIM is developed based on smooth-joint model. The structure of PIM includes four major modification concepts: contact area equalization, stiffness adjustment, exceeded force recapture, and normal force redistribution. Through PIM, the forces of the interface will be correctly calculated based on input joint parameters and provide expected joint macromechanical behavior. Two mechanical model has been provided in the PIM, one is the Mohr-Coulomb failure criterion and another is the Barton-Bandis failure criterion. The former model can simulate shear mechanical behavior under different normal stress based on input cohesion, peak friction angle and residual friction angle, the latter model can simulate cohesion-less joint mechanical behavior with joint roughness, normal stress, joint wall strength and residual friction angle. The shear-displacement curves and the failure envelopes of two models are plotted, and the dilation curves and the closure curves of Barton-Bandis model have also been provided to proof the performance of the PIM. The simulation results show that the PIM can reasonably reflect the mechanical behavior of joint model in discrete element method.

Original languageEnglish
StatePublished - 2020
Event16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019 - Taipei, Taiwan
Duration: 14 Oct 201918 Oct 2019


Conference16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019


  • Discrete element method
  • Rock joint
  • Smooth-joint model


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