不同剪切边界条件下多尺度岩石结构面剪切力学特性研究

doi:10.3724/1000-6915.jrme.2025.0998

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Abstract To elucidate the shear mechanical behavior of rock structural surfaces under different shear boundary conditions and the underlying mechanisms governing size effects, a multiscale rock structural-plane model with identical roughness morphology was developed using the particle flow method. A systematic comparative analysis was conducted of the shear strength and deformation characteristics, crack evolution, and stress-field distribution of specimens with different length-to-height ratios under conventional unilateral shear loading and fully surrounding shear-loading conditions. The results indicate that, under unilateral shear loading, both the pre-peak shear stiffness and shear strength decrease continuously with increasing structural-plane size. Shear deformation and crack evolution along the structural surface exhibit pronounced size effects, which primarily arise from the nonuniform transfer of shear deformation and stress along the surface. In contrast, under fully surrounding shear loading, the structural surface undergoes synchronized shear deformation as an integrated whole. Consequently, the shear stiffness, peak strength, and crack density are relatively insensitive to changes in specimen dimensions, resulting in substantially weaker size effects. Microscopic analysis further reveals that fully surrounding shear loading effectively alleviates localized stress concentrations and promotes the uniform propagation of cracks along the structural surface. Shear failure occurs predominantly through an overall wear mechanism. These findings clarify the mechanisms by which shear-loading conditions regulate the mechanical behavior and size effects of rock structural surfaces, while also highlighting the potential limitations of conventional direct shear tests for characterizing shear properties under seismic loading or large-scale sliding conditions. The results provide a new theoretical basis for the rational determination of shear-strength parameters for structural surfaces and the stability assessment of rock masses in seismic engineering.

Key words： rock mechanics shear boundary conditions size effect shear mechanical properties particle flow numerical simulation

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	GU Qiuxin1
	2
	ZHANG Qiang1
	2*
	ZHANG Kai1
	2
	YE Sizhe1
	2
	HAN Guilei1
	3

Cite this article:

GU Qiuxin1,2,ZHANG Qiang1, et al. Shear mechanics characteristics of multiscale rock structure faces under different shear boundary conditions[J]. , 2026, 45(11): 3325-3339.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0998 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I11/3325

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