MICROMECHANICAL ANALYSES ON GRANULAR COLUMN FORMATION AND MACROSCOPIC DEFORMATION

概要

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For a more accurate prediction of the failure of a granular material, it is essential to clarify the constitutive relations after its peak strength on which the initiation and development of shear bands play an essential role. Since the shear bands consist of granule column if viewed microscopically, micromechanical analysis is suitable to understand the nature of the shear bands. This paper proposes a new model of microstructure of the granular material; a rigid granular particle and surrounding empty void whose static and kinematics are rigorously formulated. A granule column is then regarded as an assembly of randomly piled grains and voids, and the average behavior is computed by conducting a Monte-Calro simulation of forming such assemblies. The strain localization due to the granule columns is well reproduced in this simulation. In particular, it is shown that while most assemblies grow as the load increases, fewer assemblies keep growing once the load attains a critical value. Simulation is done for various micromechanical parameters such as grain geometry and friction coefficients, and their effects on the assembly behavior are discussed.
社団法人地盤工学会の論文
1996-12-15