Optimization of Borehole Spacing and Decoupling Coefficient for Presplitting Blasting in Water-Bearing Borehole

SHEN Zewei; LIU Haoshan; ZHANG Zhiyu; HUANG Yonghui; HE Defu; ZHANG Shuai

doi:10.11858/gywlxb.20251292

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Chinese Journal of High Pressure Physics > 2026 > Corrected proof

SHEN Zewei, LIU Haoshan, ZHANG Zhiyu, HUANG Yonghui, HE Defu, ZHANG Shuai. Optimization of Borehole Spacing and Decoupling Coefficient for Presplitting Blasting in Water-Bearing Borehole[J]. Chinese Journal of High Pressure Physics. doi: 10.11858/gywlxb.20251292

Citation:

SHEN Zewei, LIU Haoshan, ZHANG Zhiyu, HUANG Yonghui, HE Defu, ZHANG Shuai. Optimization of Borehole Spacing and Decoupling Coefficient for Presplitting Blasting in Water-Bearing Borehole[J]. Chinese Journal of High Pressure Physics. doi: 10.11858/gywlxb.20251292

Citation:

SHEN Zewei, LIU Haoshan, ZHANG Zhiyu, HUANG Yonghui, HE Defu, ZHANG Shuai. Optimization of Borehole Spacing and Decoupling Coefficient for Presplitting Blasting in Water-Bearing Borehole[J]. Chinese Journal of High Pressure Physics. doi: 10.11858/gywlxb.20251292

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Optimization of Borehole Spacing and Decoupling Coefficient for Presplitting Blasting in Water-Bearing Borehole

doi: 10.11858/gywlxb.20251292

SHEN Zewei^{1, 2
,},
LIU Haoshan^{1, 2},
ZHANG Zhiyu^{1, 2,*
,
,},
HUANG Yonghui³,
HE Defu⁴,
ZHANG Shuai^{1, 2}

1.
Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
Advanced Blasting Technology Engineering Research Center of Yunnan Province Education Department, Kunming 650093, Yunnan, China
3.
Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
4.
Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

Received Date: 31 Dec 2025
Rev Recd Date: 29 Jan 2026

Available Online: 05 Feb 2026

Abstract

Abstract

In water-bearing borehole presplitting blasting, the incompressibility and high wave impedance of the water medium significantly alter the transmission pathways of explosive energy and the rock fragmentation mechanism. As a result, traditional parameter design methods based on air-filled boreholes often lead to high overbreak ratios and excessive damage to the retained rock mass in water-bearing strata. Taking the water-rich slope in a phosphate mine as the engineering background, this study establishes a coupled smoothed particle hydrodynamics-finite element method (SPH-FEM) numerical model. The model is employed to systematically investigate the propagation characteristics of blast-induced stress waves, rock mass damage evolution, and crack propagation behavior under different borehole spacing and decoupling coefficients. The results indicate a strong correlation between the superposition of stress waves from adjacent boreholes and the coalescence of presplitting cracks. When the borehole spacing is 1.4 m and the decoupling coefficient is 2.34, the average crack propagation length reaches 49.48 cm, enabling the formation of regular and continuous through-going presplitting cracks while effectively suppressing excessive crushing around the borehole wall and the development of secondary cracks. Field tests further validate the reliability of the numerical simulations: utilizing the optimized parameters, the half-hole rate of presplitting blasting in water-bearing borehole increases to 85%, and the reduction rate of acoustic wave velocity decreases by 18% compared to conventional blasting, demonstrating favorable damage control performance and crack-forming effectiveness under water-bearing conditions. The findings provide a useful reference for the design of presplitting blasting parameters in complex hydrogeological environments.
- presplitting blasting,
- water-bearing borehole,
- smoothed particle hydrodynamics-finite element method (SPH-FEM),
- borehole spacing,
- decoupling coefficient

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References(34)

References

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Optimization of Borehole Spacing and Decoupling Coefficient for Presplitting Blasting in Water-Bearing Borehole

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Optimization of Borehole Spacing and Decoupling Coefficient for Presplitting Blasting in Water-Bearing Borehole

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