A study on explosive load history of rock blasting considering rock failure zones

SUN Pengchang; YANG Guangdong; LU Wenbo; FAN Yong; MENG Haili; XUE Li

doi:10.11883/bzycj-2023-0206

Volume 44 Issue 3

Mar. 2024

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Article Navigation > Explosion And Shock Waves > 2024 > 44(3): 035201

SUN Pengchang, YANG Guangdong, LU Wenbo, FAN Yong, MENG Haili, XUE Li. A study on explosive load history of rock blasting considering rock failure zones[J]. Explosion And Shock Waves, 2024, 44(3): 035201. doi: 10.11883/bzycj-2023-0206

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SUN Pengchang, YANG Guangdong, LU Wenbo, FAN Yong, MENG Haili, XUE Li. A study on explosive load history of rock blasting considering rock failure zones[J]. Explosion And Shock Waves, 2024, 44(3): 035201. doi: 10.11883/bzycj-2023-0206

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A study on explosive load history of rock blasting considering rock failure zones

doi: 10.11883/bzycj-2023-0206

SUN Pengchang^{1, 2
,},
YANG Guangdong^{2
,
,},
LU Wenbo³,
FAN Yong²,
MENG Haili¹,
XUE Li¹

1.
Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China
2.
Hubei Key Laboratory of Construction and Management in Hydropower Engineering, China Three Gorges University, Yichang 443002, Hubei, China
3.
State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, Hubei, China

Received Date: 2023-06-07
Rev Recd Date: 2024-01-16

Available Online: 2024-01-17

Publish Date: 2024-03-14

Abstract

Abstract

Due to the deficiency that dynamic processes of rock blasting and rock failure zones around a blasthole are not simultaneously considered, the explosion load history of rock blasting considering rock failure zones and its reliability were investigated. Combining theoretical solutions of the dynamic processes of rock blasting and the rock failure zones around a blasthole, a theoretical formula of the explosive load history considering rock failure zones was derived, and a comparison was made between the derived explosive load history and a measured explosion pressure curve inside a blasthole. Both the field test on an ideal site and the numerical simulation including three explosion load conditions of single hole blasting were carried out, and the field and numerical results of blasting vibration were compared. The results show that the explosive load history considering rock failure zones consists of an ascending stage and three attenuation stages Ⅰ, Ⅱ, and Ⅲ, among which the ascending stage lasts for an extremely short time, while the attenuation stages last for a long time and are controlled by the stemming conditions. The change tendency of the calculated explosive load history considering rock failure zones is consistent with that of the measured explosion pressure curve, indicating the reliability of the explosive load history considering rock failure zones. The numerical results of single hole blasting vibration waveforms under the theoretical explosive load condition are consistent with the filed results, and the deviation ratios between the calculated peak particle velocity (PPV) results under the theoretical explosive load condition and the field PPV results are the smallest, most of which are within 7%, indicting the explosive load history considering rock failure zones has strong reliability. The explosive load history considering rock failure zones can be adjusted as the rock blasting system changes, and it has wide adaptability and good application potentials. The research results may help provide a theoretical basis for realizing efficient and accurate calculation about rock blasting.
- rock blasting,
- explosive load,
- theoretical formula,
- failure zone,
- rock breaking process

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References(41)

References

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