Application of concentrated energy interval charging blasting in peripheral hole for controlling over and under-excavation in soft rock tunnels

Peng Shiming; Xu Shunxiang; Wang Wei; Dong Qian; Sun Yong

doi:10.20265/j.cnki.issn.1007-2993.2024-0413

Volume 39 Issue 6

Dec. 2025

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Article Navigation > GEOTECHNICAL ENGINEERING TECHNIQUE > 2025 > 39(6): 885-888

Peng Shiming, Xu Shunxiang, Wang Wei, Dong Qian, Sun Yong. Application of concentrated energy interval charging blasting in peripheral hole for controlling over and under-excavation in soft rock tunnels[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(6): 885-888. doi: 10.20265/j.cnki.issn.1007-2993.2024-0413

Citation:

Peng Shiming, Xu Shunxiang, Wang Wei, Dong Qian, Sun Yong. Application of concentrated energy interval charging blasting in peripheral hole for controlling over and under-excavation in soft rock tunnels[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(6): 885-888. doi: 10.20265/j.cnki.issn.1007-2993.2024-0413

Citation:

Peng Shiming, Xu Shunxiang, Wang Wei, Dong Qian, Sun Yong. Application of concentrated energy interval charging blasting in peripheral hole for controlling over and under-excavation in soft rock tunnels[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(6): 885-888. doi: 10.20265/j.cnki.issn.1007-2993.2024-0413

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Application of concentrated energy interval charging blasting in peripheral hole for controlling over and under-excavation in soft rock tunnels

doi: 10.20265/j.cnki.issn.1007-2993.2024-0413

1.
School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
2.
School of Science, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
3.
Jianghan University, Wuhan 430081, Hubei, China
4.
School of Resources, Shandong University of Science and Technology, Taian 271000, Shangdong, China

Received Date: 2024-09-10
Accepted Date: 2025-02-14
Rev Recd Date: 2025-01-21

Available Online: 2025-12-08

Publish Date: 2025-12-08

Abstract

Abstract

To address the issues of severe over-excavation and under-excavation, complex operation, and high cost in smooth blasting of surrounding holes in soft rock tunnels, a concentrated energy interval charging technology for surrounding holes was proposed. The principle of this technology is to use the high-temperature, high-pressure, and high-energy-density axial metal cumulative jet generated by the interval charging cumulative blasting device between the charge and surrounding holes to detonate the interval charges. Three charging structures of interval charges were designed on-site, and blasting experiments were conducted. Through a comprehensive evaluation of blasting effects and construction efficiency, the blasting scheme with a charge interval of 45 cm was determined to be adopted. Compared with the original scheme, the optimized scheme using the concentrated energy interval charging technology for surrounding holes reduces over-excavation and under-excavation by 41.77%, increases the semi-eye retention rate by 9.47%, and simultaneously reduces the usage of shotcrete and detonating cords. It effectively simplifies the operation difficulty of charging surrounding holes and reduces costs, achieving good surrounding hole blasting effects and economic benefits.
- smooth blasting,
- charge structure,
- shaped charge blasting,
- blasting effect

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References(15)

References

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Application of concentrated energy interval charging blasting in peripheral hole for controlling over and under-excavation in soft rock tunnels

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Application of concentrated energy interval charging blasting in peripheral hole for controlling over and under-excavation in soft rock tunnels

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