Affiliation:
1. College of Geosciences and Engineering North China University of Water Resources and Electric Power Zhengzhou China
2. Faculty of Engineering China University of Geosciences Wuhan China
3. School of Civil Engineering Henan Polytechnic University Jiaozuo China
4. Innovation Platform for Scientific Coal Mining Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization Jiaozuo China
Abstract
AbstractFlaw length has a significant effect on the cracking behaviour of fractured rock. PFC2D was used to simulate the uniaxial compression of red sandstone samples with secondary flaw lengths L2 of 0 mm, 5 mm, 10 mm, 15 and 20 mm under different primary flaw angles α(α = 0°, 15°, 30°, 45°, 60°, 75°, and 90°). Based on the simulation results, the effects of the secondary flaw length on the mechanical parameters, crack initiation location and crack evolution process of the fractured rock were analysed. Then, a method for judging the initiation location of the first cracks was proposed. Finally, the characteristics of the particle displacement field at preexisting flaw tips during first and secondary crack initiation were analysed. The results of this study are helpful for more deeply understanding the cracking behaviour of fractured rock.
Funder
National Natural Science Foundation of China