不同剪切位移下矿物结构对花岗岩结构面剪切特性的影响

doi:10.3724/1000-6915.jrme.2025.0178

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Abstract Granite fractures develop distinct mineral structures at various stages of evolution and experience different shear displacements during tectonic movements, including fault activities and folding. To investigate the coupled effects of shear displacement and mineral structure on the shear properties of granite fractures, direct shear tests were conducted on four different types of split granite fractures at three distinct shear displacements. The study examined the shear mechanical properties, acoustic emission (AE) evolution patterns, and macro-and mesoscopic damage characteristics. Furthermore, the underlying mechanisms by which shear displacements and mineral structures influence the shear behavior of granite fractures were elucidated. Experimental results indicate that (1) with increasing shear displacement, the shear strengths of granite fractures decrease, and the shear dilation curves exhibit a bilinear trend. Coarse-grained granite fractures (CGF) demonstrate higher shear strengths than fine-grained fractures (FGF), and the presence of compact mineral textures and larger quartz grains enhances the shear strength of granite fractures. (2) The stick-slip amplitudes increase with shear displacement, peaking at the critical displacement. FGF generally exhibit larger stick-slip amplitudes than CGF, and a higher quartz content further amplifies this effect. (3) The time required to reach an active AE state decreases with increasing shear displacement. CGF tend to generate low-frequency, high-energy AE events before peak strength, while FGF produce more high-amplitude AE events during stick-slip. The critical displacement thresholds trigger a proliferation of low-magnitude AE activities. (4) Shear damage is primarily characterized by the wear and breakage of secondary asperities at low shear displacements. As shear displacement increases, wear production initially increases before entering a decreasing regime, ultimately stabilizing. When mineral grain sizes are comparable, fractures with higher quartz content and tighter grain boundaries exhibit less microscopic damage. CGF develop larger damage zones but have shorter transition regions compared to FGF. The influence of mineral structures and shear displacement on the shear behavior of granite fractures was clarified, providing experimental support for the analysis of catastrophic failure mechanisms and stability assessments in rock mass engineering.

Key words： rock mechanics granite fractures stick-slip shear displacement mineral structures acoustic emission

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	Articles by authors
	ZHANG Junnan
	WANG Feili
	MENG Fanzhen
	XIU Zhanguo
	XU Zhengyang
	GAO Jian
	ZHANG Yumin

Cite this article:

ZHANG Junnan,WANG Feili,MENG Fanzhen, et al. Effects of mineral structures on the shear response of granite fractures under different shear displacements[J]. , 2025, 44(10): 2775-2792.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0178 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I10/2775

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