Study on the Improved Method of Wedge Cutting Blasting with Center Holes Detonated Subsequently

Bing Cheng, Haibo Wang, Qi Zong, Mengxiang Wang, Pengfei Gao and Nao Lv
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Bing Cheng: School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
Haibo Wang: School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
Qi Zong: School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
Mengxiang Wang: School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
Pengfei Gao: School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
Nao Lv: School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China

Energies, 2022, vol. 15, issue 12, 1-16

Abstract: To acquire a satisfying cutting effect during medium-length hole blasting driving of rock tunnels, an improved wedge cutting blasting method with supplementary blasting of the center holes was proposed. Initially, the cavity forming mechanism of the improved cutting method was analyzed theoretically. The results suggested that cutting hole blasting could realize the ejection of rock within the range from free face to critical cutting depth, and hence reduce the restraining force of the center hole blasting, and the supplementary blasting of the center holes could further accomplish the expulsion of the residuary rock. Subsequently, simulation of the improved cutting method was implemented to exhibit the stress wave evolution and reveal the stress field distribution. The simulation results indicated that cutting hole blasting could cause the preliminary failure of the residuary rock, and center hole blasting could strengthen the stress field intensity in 1.8–2.5 m in order to aggravate the destruction of the residuary rock. Hence, the residuary rock could be broken into small fragments that were easy to expel out. Finally, a field application experiment was conducted in a coal mine rock tunnel. Using the improved wedge cutting method instead of the conventional wedge cutting method, the full-face blasting driving efficiency was obviously enhanced and the overall blasting driving expense was significantly reduced, which forcefully confirmed the engineering usefulness of the improved wedge cutting method in the medium-length hole blasting driving of rock tunnels.

Keywords: wedge cutting blasting method; center holes; supplementary blasting; cavity forming mechanism; numerical simulation; field application experiment (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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