Author(s)

Zhou Mingcong ¹, Zhao Jun ¹, Xiao Qinghua ², Zhou Ling ¹, Shi Chenchen ¹, Yuan Hao ²

Affiliation(s)

¹ China Railway No. 2 Engineering Group Co., Ltd., Chengdu, 610031, China
² School of Civil Engineering, Southwest Jiaotong University, Chengdu, 610031, China

Corresponding Author

Yuan Hao

ABSTRACT

This study addresses the challenges faced in tunnel blasting construction under complex environmental conditions in plateau areas and proposes an optimized blasting parameter design method to tackle environmental issues such as high altitude, oxygen deficiency, cold climates, and ecological fragility. Through on-site experiments at a plateau tunnel, key parameters such as blast hole diameter, charge quantity, hole spacing, and initiation sequence were optimized and adjusted, resulting in the development of a blasting parameter design method suited to the characteristics of plateau tunnels. The results show that: (1) Oxygen deficiency and cold climates reduce the efficiency of energy release during blasting, weakening the fragmentation effect, while ecological fragility requires minimal environmental disturbance from the blasting process. (2) Increasing hole diameter, increasing charge quantity, shortening hole spacing, and adopting delayed initiation significantly enhance the stability of the surrounding rock, reduce over-excavation, and minimize environmental disturbance. (3) The optimized blasting scheme reduced the average over-excavation by 41.3%, validating the feasibility and effectiveness of the blasting parameter design method. It was also found that over-excavation increased with hole spacing and decreased initially with increasing hole diameter before rising again. The research provides strong technical support and reference for future blasting construction in plateau tunnels.

KEYWORDS

Plateau tunnel; Blasting Parameters; Optimization Scheme; Over-Excavation

CITE THIS PAPER

Zhou Mingcong, Zhao Jun, Xiao Qinghua, Zhou Ling, Shi Chenchen, Yuan Hao, Tunnel Blasting Design Methods under Complex Environmental Conditions in Plateau Areas. Journal of Civil Engineering and Urban Planning (2024) Vol. 6: 26-34. DOI: http://dx.doi.org/10.23977/jceup.2024.060404.

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