岩石钻孔爆破孔壁加载特征及其影响因素分析

doi:10.3724/1000-6915.jrme.2024.0401

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Abstract Accurately understanding the loading characteristics on blasthole wall is important for rock blasting engineering. Many complex factors，such as the charge structure，initiation location，and rock wave impedance，have significant influences on the explosive loading characteristics in rock blasting. Therefore，the distribution of explosive loading on blasthole wall，as well as the transmission characteristics of blasting pressure between the explosive and the rock mass，are still unclear. In this study，based on the one-dimensional flow model of detonation products，the detonation loading characteristics of cylinder charge were investigated under different initiation locations. Subsequently，the transmission characteristics of blasting pressure between the explosive and the rock mass were studied，considering the propagation of shock waves and the expansion of detonation products. Furthermore，onsite blasting experiments at the Baima Iron were conducted to verify the influence of the charge structure and rock property on the impact loading curves. Finally，using numerical model with single blasthole，the influence of the initiation location，decoupling coefficient and rock mass on the loading characteristics was investigated. The results indicated that due to the directional effects along the charge，the blast loading on blasthole wall is non-uniform. In cases of bottom initiation and middle initiation，the peak explosive loading on blasthole wall is lowest at the initiation locations. However，as the detonation distance increases，the peak explosive loading gradually reaches a steady state. When explosives are initiated simultaneously from the top and bottom，the collision of shock waves occurs in the middle section of the charge，resulting in a sudden increase in blasting pressure at middle of the charge. Furthermore，the explosive type，charge structure，and wave impedance have influences on the transmission characteristics between the explosive and the rock medium. As the decoupling ratio increases，the pressure increase ratio gradually increase，while the pressure after the incident wave decreases. This results in a reduction of the explosive loading on blasthole wall. Under different rock masses，the pressures after the incident wave are at the same level. The pressure increase ratio gradually increases with the wave impedance，resulting in an increase in the explosive loading on blasthole wall. In practice，it is advisable to select the explosive type，charge structure，and initiation location according to the characteristics of the rock mass，so as to adjust the loading characteristics on blasthole wall，further improving the blasting excavation effects.

Key words： rock mechanics rock blasting detonation loading transmission of blasting pressure initiation location charge structure wave impedance

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	Articles by authors
	ZHOU Haixiao1
	2
	GAO Qidong1
	2
	WANG Guangyao1
	2
	WANG Yaqiong1
	2
	LENG Zhendong3
	YANG Qing1
	2

Cite this article:

ZHOU Haixiao1,2,GAO Qidong1, et al. Loading characteristics on blasthole wall and their influencing factors in rock blasting[J]. , 2025, 44(S1): 158-170.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0401 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/IS1/158

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