硬性结构面剪切全过程形貌接触演化特征研究

doi:10.3724/1000-6915.jrme.2024.1012

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Abstract The shear behavior of rock joints is often considered a “black box” problem, as current experimental methods are inadequate for directly capturing the evolution of surface morphology and contact characteristics. In this study, transparent joint specimens exhibiting natural surface morphology and mechanical properties akin to marlstone are fabricated using high-transparency Veroclear material and advanced 3D printing technology. Visualized direct shear tests are subsequently conducted under varying normal stresses and shear rates. The results reveal that: (1) in the initial shear stage, contact is predominantly concentrated at the center of the joint surface. As normal stress increases, the contact area gradually expands, radiating outward from the center toward the edges. Compared to the initial contact area, the newly formed contact area during shearing is relatively small and primarily located near the edges, with its distribution varying across different stages of the shear process. (2) The shear rate significantly influences the contact behavior of the joint asperities. At lower shear rates, the extended contact duration between asperities facilitates greater compaction and an increase in the contact area. Conversely, at higher shear rates, the contact time is reduced, and the contact mode between asperities transitions from slip-dominated to localized transient contact. (3) An analysis of the variation in contact angles of asperities corresponding to both the initial and newly formed contact areas indicates that the initial contact angle is closely linked to the peak dilation angle. Based on this relationship, a method for quantifying the initial contact angle is proposed to estimate the shear strength of rock joints. These conclusions provide valuable insights for a deeper understanding of the shear mechanism of rock joints.

Key words： rock mechanics joint direct shear test normal stress shear rate contact evolution

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	Articles by authors
	HUANG Man1
	2
	CHEN Jialong1
	2
	WENG Hanqian3
	HONG Chenjie3
	TAO Zhigang3
	ZHANG He1
	2

Cite this article:

HUANG Man1,2,CHEN Jialong1, et al. Contact evolution of hard joint surface morphology during shearing process[J]. , 2025, 44(8): 2029-2039.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.1012 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I8/2029

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