Numerical modeling for a simulated rockburst experiment using LS-DYNA

• Published in: Underground Space
• Main Authors: C.P. Yi, E. Nordlund, P. Zhang, S. Warema, S. Shirzadegan
• Format: Article in Journal/Newspaper
• Language: English
• Published: KeAi Communications Co., Ltd. 2021
• Subjects: Simulated rockburst experiments; Ground support systems; Numerical modeling; Engineering geology. Rock mechanics. Soil mechanics. Underground construction; TA703-712; Kiruna
• Online Access: https://doi.org/10.1016/j.undsp.2019.11.002; https://doaj.org/article/2e493ed8ffd04e42b2b26824e81c5658

Ground support systems are commonly used to mitigate the potential consequences of rockburst in burst prone mines. To assess the capacity of ground support systems when subjected to dynamic loading, simulated rockburst tests using blasting were conducted at the Kiruna Mine. In this study, a numerical simulation for one of the field tests was conducted using the LS-DYNA code to investigate the dynamic response of the ground support systems including shotcrete and rockbolts. The numerical results showed a similar particle vibration pattern and a crack pattern to those of the field measurements. The effects of the detonator position and the charge configuration on the dynamic response of ground support systems are also discussed. Numerical results indicated that the peak particle vibrations on the tested panel increase along the direction of detonation propagation. It is difficult to use different charge concentrations in one borehole to investigate the effect of different dynamic loads on the dynamic response of support systems. Numerical results also indicated that 2D numerical modeling for simulated rockburst experiments could overestimate the dynamic response of ground support systems.