期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2020
卷号：570
期号：2
DOI：10.1088/1755-1315/570/2/022027
语种：English
出版社：IOP Publishing
摘要：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.
