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| IMPLEMENTATION AND VERIFICATION OF FRICTION IN 3D FEM/DEM |
| YAN Chengzeng，SUN Guanhua，ZHENG Hong，GE Xiurun |
| (State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
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Abstract Collision and slide between blocks are related to friction，while the original three-dimensional combined finite-discrete element method(FEM/DEM) did not consider the effect of friction. The FEM/DEM based on the potential associated with contact force was therefore discussed in detail. The potential was found to characterize the stored energy due to embedding and contacts；namely，the greater the potential，the greater the embedding and the energy stored in the contact. The classic Coulomb friction was then taken into account in the original three-dimensional FEM/DEM. An example of slider-on-ramp having an analytical solution and an example of bridge collapsing were analysed，which verified the correctness of implementation of Coulomb friction. The results show that the numerical solution of the example of bevel slider is in good agreement with the analytical solution and the improved FEM/DEM is capable of solving complex engineering problems.
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Received: 16 September 2013
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2014, Vol. 33 
