Random Initial Model If particles are arranged regularly in initial model, failure behavior is strongly affected by direction of the regularity like DEM. Simple procedure compared with packing in DEM Step -1 Fix boundary particles and a part of internal particles Step -2 Homogenize particle density Fall by Gravity Regular initial modeling See “E-MPS-fall.ppt” for the detail Random initial modeling Random Initial Model for layer 1 and 2 Hypothetical model for random initial model demonstration Three Layers Model Step -1 Fixed particles Layer 1 Layer 2 Layer 3 Select boundary particles and a part of internal particles Give small move to the internal particles according to uniform random number Fix the boundary , the selected internal and non-failure particles 3 Random Initial Model Step-2 Homogenization of particle density Pressure calculated by particle density High pressure (density) Low pressure (density) 4
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