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- Title
Rate-dependent constitutive modelling blasting crack initiation and propagation in rock masses.
- Authors
Zhang, Yongjun; Xu, Meng; Liu, Sijia; Liu, Fei; Wang, Qingsong
- Abstract
This study examines the fracture mechanism of cracks and the final blasting effects on defective rock masses under blasting loads. The failure processes of jointed rock with two prefabricated joints are investigated through numerical simulations using a two-dimensional finite element method. Subsequently, simulations are performed to analyze the blasting of granite specimens with various joint arrangements, focusing on the influence of front joint length, inclination angle, and blast hole distance on failure patterns, displacement, velocity, and stress at the joint ends. The numerical results provide a comprehensive summary of various typical failure modes near blast holes and joints for the first time. Specifically, the simulation successfully captures the characteristics of the ring crack zone, wing cracks, and main crack deflection affected by the front joint. Moreover, the results highlight the shielding effect of the front joint, which enhances damage in the medium between the borehole and the joint while exhibiting the opposite effect behind the joint in terms of stress wave propagation. Overall, this study offers objective insights into the mechanics and failure characteristics of jointed rock masses under blasting loads and serves as a valuable reference for the design and optimization of blasting operations.
- Subjects
STRESS waves; CRACK propagation (Fracture mechanics); BLASTING; BLAST effect; THEORY of wave motion; FINITE element method; BLAST waves
- Publication
International Journal of Coal Science & Technology, 2023, Vol 10, Issue 1, p1
- ISSN
2095-8293
- Publication type
Article
- DOI
10.1007/s40789-023-00633-1