基于GSI分级的小断面引水隧洞超欠挖预测与钻爆参数优化研究

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Abstract To address the challenge of excessive over-under excavation often encountered in the excavation of small-section diversion tunnels due to frequent changes in rock grades，this research investigates quantitative damage prediction and the optimization of blasting effects. The Quanmutang Diversion Tunnel Project was chosen as the case study. Utilizing three-dimensional image reconstruction technology，a relationship between over-under excavation and GSI classification was established. A numerical model was constructed based on actual blasting hole positions，and the mechanical parameters of the surrounding rock，which change continuously，were calculated in the numerical simulation based on a quantified GSI classification method and the Hoek-Brown criterion. Blasting damage was then simulated，and the results were compared with actual over-under excavation for analysis. Subsequently，based on this method，over-under excavation was predicted，and blasting parameters were optimized. The results show that the simulated contour of blasting damage closely matches the actual excavation contour，with an average error of only 2.54% for the simulated over-excavation volume per meter and 5.20% for the field-measured over-excavation volume and shotcrete amount per meter. After predicting rock mass damage under various peripheral hole spacings，blasting parameters were optimized，resulting in no under-excavation and over-excavation was controlled within the design allowable range. By correlating the GSI value with the BQ value，the mechanical parameter ranges for surrounding rock grades II to V are calculated. Over-under excavation for each rock grade under different peripheral hole spacings is predicted，resulting in recommended peripheral hole spacings of 55 cm for grade II–III and 50 cm for grade IV–V surrounding rocks.

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	Articles by authors
	LUO Yubo1
	YANG Junsheng1
	ZHAN Shuangqiao2
	ZHANG Qingbin3
	CHEN Yuncai2
	ZHANG Cong4

Cite this article:

LUO Yubo1,YANG Junsheng1,ZHAN Shuangqiao2, et al. Prediction of over-under excavation and optimization of blasting parameters in small section diversion tunnels based on GSI classification[J]. , 2024, 43(12): 3032-3043.

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https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I12/3032

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