Effects of Confining Stress on Blast-Induced Damage Distribution of Rock with Discontinuity

Rongjian Pan, Peiyu Wang (), Zilong Zhou (), Riyan Lan, Lu Chen, Hongquan Yang, Cuigang Chen, Jinkun Zhang and Yang Liu
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Rongjian Pan: Guangxi Xinfazhan Communication Group Co., Ltd., Nanning 530029, China
Peiyu Wang: School of Resources and Safety Engineering, Central South University, Changsha 410010, China
Zilong Zhou: School of Resources and Safety Engineering, Central South University, Changsha 410010, China
Riyan Lan: Guangxi Xinfazhan Communication Group Co., Ltd., Nanning 530029, China
Lu Chen: School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, China
Hongquan Yang: Guangxi Xinfazhan Communication Group Co., Ltd., Nanning 530029, China
Cuigang Chen: School of Resources and Safety Engineering, Central South University, Changsha 410010, China
Jinkun Zhang: School of Resources and Safety Engineering, Central South University, Changsha 410010, China
Yang Liu: School of Resources and Safety Engineering, Central South University, Changsha 410010, China

Sustainability, 2023, vol. 15, issue 17, 1-22

Abstract: Discontinuous rock mass, such as joints and fractures, have a great influence on the blasting quality and sometimes induce additional damage at the discontinuity. In deep rock engineering, high in situ stress makes the damage mechanism of rock with discontinuity under blasting loading more complicated. Quantitative analysis of blast-induced damage in discontinuous rock under high in situ stress is of great importance in guiding the fine blast design. In this paper, a series of numerical models have been established to quantitatively investigate the effect of confining stress and inclination angle on blast-induced damage of rock with discontinuity. The numerical results show that the discontinuity obviously changes the distribution mode of blast-induced damage, and there is more damage near the discontinuity. The blast-induced damage crack length of discontinuous rock decreases as hydrostatic stress rises. Under non-hydrostatic stress, the damage crack propagation appears to have a higher tendency in the higher confining stress direction. In addition, the inclination angle of discontinuity will affect the damage distribution of rock with discontinuity. The fragmentation degree is greatest when the discontinuity is perpendicular to the direction of higher confining stress. Due to the presence of discontinuity, the guiding effect of higher confining stress on damaged cracks is weakened. The results provide a reference for the tunnel fine-blasting design of rock with discontinuity.

Keywords: damage; confining stress; discontinuity; hydrostatic; non-hydrostatic; inclination angle (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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