Abstract
Numerical simulation of triaxial test are carried out for soil specimens with varying particle size by DEM analysis under the flexible boundary. For the purpose, soil state characteristics such as shear band formation, variation law and the difference between the global void ratio and the local void ratio are particularly focused. Results shows that the shear band of multi-graded specimen is more difficult to create, but it is thicker than that of single-graded specimen. Overall void ratio changes mostly due to particle movement at the shear band and independent to particle gradation. The shear strength of the multi-graded sample is better than that of the single-graded specimen.
Highlights
Sand is a unique natural material with a wide range of properties that are difficult to predict
It is worth to mention that the real void ratio in the shear band is different from one in the global, limiting the ability to accurately investigate mechanical behavior through laboratory experiments, since the void ratio determined in the stable condition is the specimen's overall void ratio
Due to the possible soil disruption, constant confining pressure loading must be used to restore the specimen to its required consolidation state once the boundary conditions have been replaced. 5) the two-way load board and the membrane particles that are in contact with the loaded are equal, and the direction of the constant value is in the vertical direction of the specimen, In the loading phase, at the axial strain of 0.5 %, 1.5 %, 3.0 %, 4.5 %, 6.0 %, 10.0 %, 12.5 %, 15.0 %, 17.5 %, 20.0 % the cloud map of particle rotation, the void ratio of the local position and the macroscopic behaviors are recorded
Summary
Sand is a unique natural material with a wide range of properties that are difficult to predict. It is worth to mention that the real void ratio in the shear band is different from one in the global, limiting the ability to accurately investigate mechanical behavior through laboratory experiments, since the void ratio determined in the stable condition is the specimen's overall void ratio. When it comes to analyzing the meso-scale mechanics of materials with gradation, DEM is commonly employed as a micromechanical approach [7], [10], [11].
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