恒定法向刚度条件下三维粗糙裂隙面剪切力学特性

doi:10.13722/j.cnki.jrme.2020.0259

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Abstract The effects of initial normal stress(0.02–8 MPa) and roughness coefficient JRC(12–18) on shear stress，normal displacement，normal stress and shear wear characteristics of fracture surfaces were investigated. The results show that，during the whole shear process，the normal displacement-normal stress fitting relationships of fracture surfaces present a group of parallel lines，with a constant normal stiffness boundary of 10.8 GPa/m. With increasing initial normal stress and JRC，the normal stress of fracture surfaces presents an increase，and the initial peak shear stress respectively increases by 6.201–9.974 times and 22.70%–55.76%. The normal displacement of fracture surfaces declines as the initial normal stress increases，while the dilatancy deformation tends to be intensified with increasing JRC due to gradually significant “climbing effects” along the asperities of the fracture surfaces. The peak surface resistance index decreases with increasing the initial normal stress，while increases by 10.82%–36.46% with increasing JRC. As JRC increases，the strength envelope of the initial peak shear stress becomes steeper. At the shear wear stage，the normal stress-shear stress paths can be will described using a linear function，and the fitting curves tend to be gentle as the initial normal stress increases. The binaryzation calculation results after shear tests indicate that，with increasing the initial normal stress and JRC，the ratio of the shear area on the fracture surfaces increases by 1.032–1.799 times and 8.63%–71.81%，respectively. The shear wear characteristics tend to be significant.

Key words： rock mechanics constant normal stiffness fracture surface roughness coefficient normal stress binaryzation

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	Articles by authors
	YIN Qian1
	2
	JING Hongwen1
	MENG Bo1
	LIU Richeng1
	WU Yingjie1

Cite this article:

YIN Qian1,2,JING Hongwen1, et al. Shear mechanical properties of 3D rough rock fracture surfaces under constant normal stiffness conditions[J]. , 2020, 39(11): 2213-2225.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0259 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I11/2213

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