Internal stress distribution and cracking around flaws and openings of rock block under uniaxial compression: A particle mechanics approach

摘要

Based on experimental results, bonded particle models containing flaws or/and openings were created to investigate the peak stress, crack-initiation stress, number of micro-cracks, local stress distribution and cracking behavior under uniaxial compression. It is found that flaws and openings are distinctly related to the peak stress, the crack-initiation stress and the number of micro-cracks. As the flaw inclination angle increases, the distributions of principal stresses surrounding a flaw vary, while those surrounding an opening present a similar shape with magnitude differences. The distribution of local stress well accounts for the cracking behavior.