Mesoscopic Simulation of Mechanical Behaviors of Coarse Grained Materials
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Abstract:
Based on the results of laboratory triaxial consolidated-drained tests on coarse grained materials and three-dimensional discrete particle flow theory, a numerical model of triaxial test for coarse grained materials with uniform particle contact points and same isotropic stresses was developed using the tool of PFC3D_EV and improvement of program code. Clump particles were introduced to improve the complexity of internal particle shape of the sample. The differences of stress-strain curves and volumetric strain - axial strain curves of triaxial tests under different confining pressures were compared, and the impacts of particle shape and the development law of shear bands on the strength and deformation characteristics of coarse grained materials were discussed. The results showed that (1) particle shape is the main factor on the mechanical behavior of coarse grained materials. The stress-strain curve obtained from the numerical simulation matches well with the experimental results if the complexity of internal particle shape is improved; (2) the shear dilatancy of numerical simulation is a little larger because the particle deformation and breakage cannot be performed in numerical simulation; (3) the development of displacement field indicates that strain softening accelerates the formation of shear bands; and (4) the thickness of shear bands becomes thinner with the decreasing of confining pressure .
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