A calculation method of the peak pressure on borehole wall for low decoupling coefficient charge blasting

YE Zhiwei; CHEN Ming; LI Tong; LU Wenbo; YAN Peng

doi:10.11883/bzcyj-2020-0185

Volume 41 Issue 6

Jun. 2021

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YE Zhiwei, CHEN Ming, LI Tong, LU Wenbo, YAN Peng. A calculation method of the peak pressure on borehole wall for low decoupling coefficient charge blasting[J]. Explosion And Shock Waves, 2021, 41(6): 064901. doi: 10.11883/bzcyj-2020-0185

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YE Zhiwei, CHEN Ming, LI Tong, LU Wenbo, YAN Peng. A calculation method of the peak pressure on borehole wall for low decoupling coefficient charge blasting[J]. Explosion And Shock Waves, 2021, 41(6): 064901. doi: 10.11883/bzcyj-2020-0185

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A calculation method of the peak pressure on borehole wall for low decoupling coefficient charge blasting

doi: 10.11883/bzcyj-2020-0185

YE Zhiwei^{1, 2
,},
CHEN Ming^{1, 2
,
,},
LI Tong^{1, 2},
LU Wenbo^{1, 2},
YAN Peng^{1, 2}

1.
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, Hubei, China
2.
Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, Hubei, China

Received Date: 2020-06-08
Rev Recd Date: 2020-09-30

Available Online: 2021-05-13

Publish Date: 2021-06-05

Abstract

Abstract

The peak pressure on a borehole wall is an important parameter for the analysis of rock blasting rupture and the non-fluid solid coupling explosion impact dynamic response. Based on the relevant research of calculation methods for the peak pressure on the borehole wall for contour blasting, the interaction between the air shock waves and the borehole wall during low decoupling coefficient charge blasting was theoretically analyzed, and the influencing factors of pressure increase ratio were obtained by fully considering the process of air shock wave propagation and detonation product expansion. The parameters of detonation products were used instead of those of shock wave products in theoretical derivation. The single-hole finite element blasting model with radial decoupling charge for air medium was established, and the peak pressure of the borehole wall after single-point detonation of explosives was studied under the combination conditions of multiple low decoupling coefficient charge structure commonly used in engineering blasting. Moreover, the pressure increase ratio which was the ratio of the peak pressure on the borehole wall to the quasi-static isentropic expansion pressure of explosion gas was obtained under the corresponding conditions. The results show that in the process of explosive blasting with a low decoupling coefficient, there is no separation of air shock waves and detonation products, the parameters of the detonation products have a significant effect on the parameters after air shock waves, which in turn affects the interaction between the air shock waves and the borehole wall. It reveals the essential difference between the calculation methods for the peak pressure on the borehole wall in low decoupling coefficient charge blasting and contour blasting. In addition, the propagation of the axial detonation wave in the cylindrical charge structure causes a superposition effect when the air shock wave impacts the borehole wall, and the peak pressure increases accordingly. Through statistical analysis of the relationship between the pressure increase ratio and the decoupling coefficient under different explosive types and different rock types, it is found that the pressure increase ratio increases approximately linearly with the increase of the decoupling coefficient. Based on the the results of theoretical derivation and the commonly used calculation methods for the peak pressure on the borehole wall, a method for calculating the peak pressure on the borehole wall was proposed for low decoupling coefficient charge blasting by considering the effects of explosive characteristics, medium conditions of the borehole wall, and decoupling coefficient on the pressure increase ratio after the air shock wave colliding with the borehole wall.
- decoupling charge,
- explosion pressure,
- shock wave,
- pressure increase ratio

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References(19)

References

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