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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摘要通过恒定法向刚度边界条件下真实三维粗糙裂隙面剪切试验，研究初始法向应力(0.02～8 MPa)和粗糙度系数JRC(12～18)对裂隙面剪切应力、法向位移、法向应力和表面剪切磨损特征的影响。结果表明：整个剪切过程中，裂隙面法向位移–法向应力拟合关系为一组平行直线，法向边界刚度保持在10.8 GPa/m。随着初始法向应力和粗糙度系数的增加，裂隙面法向应力均逐渐增大，初始剪应力峰值分别增加了6.201～9.974倍和22.70%～55.76%；裂隙面法向位移随初始法向应力的增加逐渐减小，而随JRC的增加，由于剪切过程中沿凸起体的“爬坡效应”趋于显著，剪胀变形逐渐加剧。峰值表面阻力指数随初始法向应力的增加线性减小，而随JRC的变化增加了10.82%～36.46%。随着粗糙度系数的增加，初始剪应力峰值强度包络线变得陡峭；剪切磨损阶段，法向应力–剪切应力路径可通过线性函数较好地拟合，且随着初始法向应力的增加，拟合曲线趋于平缓。二值化计算结果表明试验后裂隙面剪切面积占比随初始法向应力和粗糙度系数分别增加了1.032～1.799倍和8.63%～71.81%，剪切磨损特征趋于显著。

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	尹乾1
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	靖洪文1
	孟波1
	刘日成1
	吴应杰1

关键词 ：岩石力学, 恒定法向刚度, 裂隙面, 粗糙度系数, 法向应力, 二值化

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

引用本文:

尹乾1，2，靖洪文1，孟波1，刘日成1，吴应杰1. 恒定法向刚度条件下三维粗糙裂隙面剪切力学特性[J]. 岩石力学与工程学报, 2020, 39(11): 2213-2225.
YIN Qian1，2，JING Hongwen1，MENG Bo1，LIU Richeng1，WU Yingjie1. Shear mechanical properties of 3D rough rock fracture surfaces under constant normal stiffness conditions. , 2020, 39(11): 2213-2225.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0259 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I11/2213

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