Particle Shape Consideration in DEM Triaxial Test Simulations
Recent researches have been proved that particle shape significantly influences on granular soil mechanical behavior. In addition, it is considerable that undrained behavior of granular soil is a key step in geotechnical applications. In this paper a Disc
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Abstract Recent researches have been proved that particle shape significantly influences on granular soil mechanical behavior. In addition, it is considerable that undrained behavior of granular soil is a key step in geotechnical applications. In this paper a Discrete Element Method (DEM) approach has been used in which the shape of a particle is modeled by combining a set of overlapping spheres, which are connected to each other in a rigid way. Additionally, volume change has been prohibited during the simulation to model the undrained condition. The dependency of granular soil behavior on spherecity and angularity index has been examine by implementing several diverse spherecity and angularity indexes to the grains, both in drained and undrained conditions. Several triaxial tests with different confining pressures, initial void ratios and friction coefficients have been carried out on assemblies with different grain shapes. The Results have been demonstrated that particle shape has considerable effect on granular soils mechanical behavior.
1 Introduction To study the behavior of macroscopic and microscopic granular materials, accurate simulation of particle shape is of particular importance. In recent years significant developments have been made in the field of simulation of particle actual shape. Also the undrained behavior of granular materials in geotechnical engineering, is very important. The researchers conducted many studies, complete approximately identify in this field. Research has shown that the granular materials undrained behavior affected from factors such as the porosity, relative density, initial stress, stress path or strain path and anisotropy. Rothenburg and Bathurst [1], Ting et al. [2], Cleary [3], Williams and Pentland [4], Ng [5], Modeling ellipse-shaped particles. Although ellipse particles compared M. Mohammadnia A.A. Mirghasemi (&) Geotechnical Engineering, School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran e-mail: [email protected] © Springer Science+Business Media Singapore 2017 X. Li et al. (eds.), Proceedings of the 7th International Conference on Discrete Element Methods, Springer Proceedings in Physics 188, DOI 10.1007/978-981-10-1926-5_17
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to circle particles are less Desire to rotate, but to accurately not represent the real shape of the particles. Mirghasemi et al. [6], Matuttis et al. [7], Barbosa and Ghabussi [8], polygon-shaped particles proposal that was very close to the actual particle shape. One of the problem of this method modeling, a lot of time was Running. Another problem to this method, there was more than a normal vector perpendicular to the surface in edges, there cause be more difficult to estimate forces. Ashmawy et al. [9], method clusters of Overlapping discrete element for modeling the actual shape of the particles Propose. This method is efficient in terms of calculation time and with great accuracy the actual shape of the particles in two dimensions model. Matsushima [10], is al
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