Size distribution characteristics of blast-induced rock fragmentation under decoupled charge structures

MA Sizhou; LIU Kewei; YANG Jiacai; LI Xudong

doi:10.11883/bzycj-2023-0358

Volume 44 Issue 4

Apr. 2024

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MA Sizhou, LIU Kewei, YANG Jiacai, LI Xudong. Size distribution characteristics of blast-induced rock fragmentation under decoupled charge structures[J]. Explosion And Shock Waves, 2024, 44(4): 045201. doi: 10.11883/bzycj-2023-0358

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MA Sizhou, LIU Kewei, YANG Jiacai, LI Xudong. Size distribution characteristics of blast-induced rock fragmentation under decoupled charge structures[J]. Explosion And Shock Waves, 2024, 44(4): 045201. doi: 10.11883/bzycj-2023-0358

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Size distribution characteristics of blast-induced rock fragmentation under decoupled charge structures

doi: 10.11883/bzycj-2023-0358

School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China

Funds: LI X B. Rock dynamics fundamentals and applications [M]. Beijing: Science Press, 2014: 357-360.

Received Date: 2023-10-06
Rev Recd Date: 2024-01-14

Available Online: 2024-01-15

Publish Date: 2024-04-07

Abstract

Abstract

Decoupled charge structure is widely used in contour blasting for rock excavation engineering, and its efficacy in rock breaking is tied intricately to both the decoupling ratio and the transfer features of explosion energy. In this study, the analysis delves into the damage degree and failure patterns of cubic red sandstone samples through two groups of lab-scale blasting tests utilizing various charging modes. To precisely quantify the features of rock fragmentation size distribution (FSD) induced by blasting load, a three-parameter generalized extreme value (GEV) function was introduced. In addition, a three-dimensional finite element model was developed in ANSYS software. The numerical model was calibrated based on the tested results of sample R1 by comparing the fracture networks and FSD curves. This validated model was then deployed to model the rock fracture behavior under decoupled charge blasting, and the evolution of blasting cracks and explosion pressure inside the rock sample was reproduced. Moreover, the effects of axial and radial decoupled ratios and the choice of coupling medium on the rock fragmentation and fracture patterns were discussed. The results showed that the three-parameter GEV function can better characterize the rock fragmentation features resulting from blasting. Notably, the average size of the fragment decreases linearly with the decrease of the decoupling ratio, and the degree of fragmentation tends to be uniform. By comparing the energy distribution and damage levels of rock when using different coupling mediums, it was found that water as the coupling medium exhibits the highest efficiency in energy transfer, followed by wet sand and dry sand, and air has the lowest energy transfer efficiency. Furthermore, the theoretical stress transmission coefficient calculated by the equivalent wave impedance method can well reflect the rock fragmentation features and serve as a valuable reference for rock blasting in decoupled charge.
- decoupled charge,
- coupling medium,
- rock fragmentation,
- explosion energy,
- stress transmission coefficient

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References(33)

References

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