Open AccessInfluence of Particle Shape on Mechanical Properties of Coal Measure Soil by Discrete Element Method
Author(s) -
Bang Zhang,
Haoran Feng,
Hong Zhang
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/455/1/012104
Subject(s) - discrete element method , dilatant , particle (ecology) , materials science , shear (geology) , mechanics , rotation (mathematics) , composite material , geometry , physics , geology , mathematics , oceanography
On the basis of the discrete element theory, PFC3D was used to generate five particle models of different shapes. The impacts of particle shape on the macroscopic physical and mechanical properties of soil mass were analyzed through the numerical simulation of triaxial test as well as from a microscopic point of view. The results showed that the shear strength of irregularly shaped particles is higher than that of spherical particles, and that among the irregularly shaped particles, the shear strength of cylindrical particles is higher than that of ellipsoidal particles. Since spherical particles are associated with relatively large rotation angles during loading, samples have obvious dilatancy. However, among the irregularly shaped particles, since the inter-particular interlocking is strong and the rotation angles are relatively small, samples does not display significant dilatancy. The more irregular is the particle shape, the greater will be the energy dissipated by damping, indicating that the lesser is the kinetic energy stored in samples, the less likely the particles will move, and the more stable the sample will be.