围压条件下粒子冲击破岩裂隙扩展机理研究

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Abstract In order to reveal the influence of the confining pressure on the formation and expansion mechanism of rock fissures under particle impact, particle impact rock-breaking experiments and micro-nano industrial CT scanning experiments were carried out, which clarified the influence of the confining pressure on the characteristics of the rock fissure expansion under the action of particle impact; and numerical simulations were carried out on the particle impact under the conditions of different confining pressures, to analyze the evolution process of the rock's stress and fissure fields, and to reveal the intrinsic mechanism of the confining pressure influencing the expansion of fissures. The results show that after the particles impact the rock, a fracture zone and intergranular main crack propagation zone are thus formed in the rock. The shear stress and tensile stress caused by compressive stress are the main reasons for the formation of the fracture zone, while the formation of the intergranular main crack propagation zone is mainly due to tangential derived tensile stress. The confining pressure induces prestress between rock particles such that the derived tensile stress needs to overcome the initial compressive stress between the particles to form tensile fractures. And the increase in the confining pressure leads to increases in the proportion of shear cracks and friction effects between rock particles, resulting in an increase in energy consumption for the same number of cracks，which inhibits the formation of the fracture zone and intergranular main crack propagation zone.

Key words： water jet particle jet impacting breaking rock auxiliary rock breaking hard rock tunneling

Received: 10 July 2023 Published: 28 April 2024

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	Articles by authors
	LIU Yong1
	2
	LI Xing1
	2
	GUO Xinhui1
	2
	WEI Jianping1
	2
	SONG Dazhao3

Cite this article:

LIU Yong1,2,LI Xing1, et al. Research on crack propagation mechanism of rock impacted by particles under confining pressure[J]. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(8): 1-10.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2024/V43/I8/1

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