Affiliations: [a] Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao, PR China | [b] Centre for Future Materials, The University of Southern Queensland, Toowoomba QLD, Australia
| [c] College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, PR China | [d] College of Civil Engineering, Hunan University, Changsha, PR China
Correspondence:
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Corresponding author. Xiantang Zhang, Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, PR China. E-mail: zzxhtm@163.com.
Abstract: In order to study the effect of empty hole between adjacent blast holes in the perforation process of blasting, based on rock blasting theory, the authors use ANSYS/LS-DYNA to simulate the process of rock fragmentation of double blast holes blasting with one empty hole at the center position. The rock fragmentation effect by blasting, the propagation of cracks between adjacent blast holes and the pressure state of the element near the empty hole are analyzed. The results showed that the empty hole has a guiding effect on cracks propagation between blast holes and the effect of cracks propagation in the direction of blast holes connection is better. The peak pressure in vertical direction near the empty hole is the largest and the pressure propagation velocity in horizontal direction is the fastest. And with the increase of blast holes spacing, the pressure near the empty hole and the pressure change rate also decrease. The numerical simulation results show that when the blast holes spacing is 0.4 m∼0.6 m, the effect of rock fragmentation and cracks propagation between blast holes are good. The above research results are consistent with theoretical analysis, which can provide reference for selecting reasonable blast holes spacing for engineering.
