Open AccessDEM simulation of the complete triaxial test of sandstone
Author(s) -
Lei Li,
Jun Guang Huang,
Wei Ke Li,
Minlin Jiang
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 - 10.1088/1755-1315/570/2/022027
Subject(s) - dilatant , overburden pressure , geotechnical engineering , triaxial shear test , dissipation , materials science , hardening (computing) , ultimate tensile strength , softening , residual strength , shrinkage , geology , composite material , thermodynamics , physics , layer (electronics) , shear (geology)
Complete triaxial tests considering residual strength are of great significance in analyses of the mechanical properties of rock in deep-rock engineering. In this paper, the complete triaxial test of Berea sandstone was quantitatively simulated using the discrete element method. The macro- and micromechanical properties of Berea sandstone were analyzed, and the following conclusions were obtained: (1) As the confining pressure increases, the peak and residual strengths of the sample increases, the stress–strain curves gradually change from softening to hardening, and the volume curves gradually change from dilatancy to shrinkage. (2) When the confining pressure is low, bond failure between particles mainly occurs under the state of tensile stress. As the confining pressure increases, compressive state failure gradually exceeds tensile state failure. (3) Under different confining pressures, the energy dissipated by friction between particles is far greater than other forms of energy dissipation and the energy dissipated by rolling between particles is always greater than the energy dissipated by twisting.