Abstract: To optimize and control the over/under-excavation phenomena observed in the excavation of flat and super-large cross-section tunnels using the drill and blast method. A highway tunnel served as a case study, where numerical models for tunnel sections with grade Ⅲ and Ⅳ surrounding rock were established. The blasting process of the tunnel cross-section was replicated, and field-measured data were utilized to validate the numerical models. Analyses were performed on the variations in blast damage nephograms, blast profiles, maximum and average over/under-excavation distances, and over-excavation areas across different blasting schemes. These analyses quantified the impact of varying peripheral and cut hole spacings, as well as the charge quantities in blast holes, on the over/under-excavation during tunnel blasting. Subsequent to these analyses, the blasting schemes were optimized. By integrating numerical simulation outcomes with field-measured data, an optimal construction scheme was deduced that effectively minimizes over-excavation: the peripheral hole spacing was adjusted to 1 m for grade Ⅲ surrounding rock and to 0.8 m for grade Ⅳ.
田瑞端,莫冠旺,李响. 超大断面扁平结构隧道矿山法超欠挖优化控制研究[J]. 隧道与地下工程灾害防治, 2024, 6(2): 84-98.
TIAN Ruiduan, MO Guanwang, LI Xiang. Optimization on the over/under-excavation of flat and super-large cross-section tunnel with drill and blast method. Hazard Control in Tunnelling and Underground Engineering, 2024, 6(2): 84-98.
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2024, Vol. 6 
