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Comparison of undrained behaviors of granular media using fluidcoupled discrete element method and constant volume method

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第6期12卷 1272-1289页

作者： Wei Zhang Leo Rothenburg Department of Civil and Environmental Engineering University of WaterlooWaterlooN2L 3G1Canada

The fluid-coupled discrete element method(DEM)and the constant volume method as two types of discrete modeling methods for fundamental study of undrained responses of granular materials,have been discussed by many *** fluid-coupled DEM,which couples the motions of discrete particles with pore fluid movements,is theoretically robust although it requires a large amount of computation *** a substitution for the complex fluid-coupled DEM,the constant volume method simulates an undrained condition for a saturated granular material by simply preserving the total volume of a granular assembly without considering interactions between fluids and particles;hence,the validity of its results is *** this paper,the undrained behaviors of granular assemblies simulated using the aforementioned two methods are *** on a comparison of both macroscopic and microscopic responses given by the two methods,it is demonstrated that the constant volume method may reasonably simulate the responses of a loose saturated granular material with very coarse grains,which has a high permeability,and thus a rapid pore pressure ***,it is ineffective in simulating the responses of a loose material with fine components due to its failure to capture the process of a slow dissipation of the excess pore pressure among the individual *** regard to the dense material adopted,similar behaviors at the early and intermediate shearing stages given by the two methods are displayed.

关键词： Micromechanics Constant volume method fluid-coupled discrete element method (DEM) Undrained behavior

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