Collision mechanism and rock-breaking effect of explosive stress waves induced by staggered initiation

FAN Yong; GUO Yiming; LENG Zhendong; YANG Guangdong; TIAN Bin

doi:10.11883/bzycj-2023-0391

Volume 44 Issue 6

Jun. 2024

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FAN Yong, GUO Yiming, LENG Zhendong, YANG Guangdong, TIAN Bin. Collision mechanism and rock-breaking effect of explosive stress waves induced by staggered initiation[J]. Explosion And Shock Waves, 2024, 44(6): 063201. doi: 10.11883/bzycj-2023-0391

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FAN Yong, GUO Yiming, LENG Zhendong, YANG Guangdong, TIAN Bin. Collision mechanism and rock-breaking effect of explosive stress waves induced by staggered initiation[J]. Explosion And Shock Waves, 2024, 44(6): 063201. doi: 10.11883/bzycj-2023-0391

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Collision mechanism and rock-breaking effect of explosive stress waves induced by staggered initiation

doi: 10.11883/bzycj-2023-0391

FAN Yong^{1, 2
,},
GUO Yiming^{1, 2},
LENG Zhendong^{1, 2, 3
,
,},
YANG Guangdong^{1, 2},
TIAN Bin^{1, 2}

1.
Hubei Key Laboratory of Construction and Management in Hydropower Engineering, China Three Gorges University, Yichang 443002, Hubei, China
2.
College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, Hubei, China
3.
China Gezhouba Group Explosive Co. Ltd., Chongqing 401121, China

Received Date: 2023-10-30
Rev Recd Date: 2024-01-18

Available Online: 2024-03-02

Publish Date: 2024-06-18

Abstract

Abstract

Different initiation methods directly determine the stress wave propagation and explosion energy transmission law caused by drilling and blasting, thus affecting the effect of rock fragmentations. In this paper, the collision mechanism of stress waves and rock fragmentation characteristics induced by blasting with different initiation methods were studied. Based on the theory of frontal and oblique collision of stress waves, the interaction mechanism of stress waves between holes was studied to prove the stress enhancement effect caused by wave collision under the staggered initiation mode. Using the RHT model for rock and JWL state equation for explosive in the ANSYS/LS-DYNA software, the magnitude of stress waves between holes and the rock fragmentation characteristics were simulated under the staggered, bottom and top initiation modes. Finally, combined with on-site experiments, the interaction of stress waves and the characteristics of fragmentation distribution for blasting of rock mass containing gravel under different initiation modes were compared and analysed. Results show that under the staggered initiation mode, a frontal collision of stress waves happens at the midpoint between two holes, and the pressure after the collision is 2.4 times that of the stable propagation of the stress wave. An oblique collision occurs between 0° and 44°, and the ratio of collision pressure to the stable pressure ranges from 4.1 to 2.3. Mach reflection occurs between 44° and 90°, and the ratio of collision pressure to the stable pressure ranges from 3.5 to 1. The rates of rock fragmentations with a size less than 250 mm under staggered and bottom initiation modes are 25.5% and 20.9%, respectively. The rates of rock fragmentations with a size larger than 750 mm under staggered and bottom initiation modes are 9.2% and 17.5%, respectively. The stress enhancement effect caused by wave collision under the staggered initiation mode can significantly improve the blasting fragmentation of rock mass containing gravel.
- staggered initiation,
- bottom initiation,
- top initiation,
- stress wave collision,
- blasting fragmentation

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References(30)

References

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