Shear mechanical properties and frictional sliding responses of rough joint surfaces under dynamic normal displacement conditions
A comprehensive understanding of the dynamic frictional characteristics in rock joints under high normal load and strong confinement is essential for ensuring the safety of deep engineering construction and mitigating geological disasters.This study conducted shear experiments on rough rock joints under displacement-controlled dynamic normal loads,investigating the shear behaviors of joints across varying initial normal loads,normal loading frequencies,and normal loading amplitudes.Experimental results showed that the peak/valley shear force values increased with initial normal loads and normal loading frequencies but showed an initial increase followed by a decrease with normal loading amplitudes.Dynamic normal loading can either increase or decrease shear strength,while this study demonstrates that higher frequencies lead to enhanced friction.Increased initial normal loading and normal loading frequency result in a gradual decrease in joint roughness coefficient(JRC)values of joint surfaces after shearing.Positive correlations existed between frictional energy dissipation and peak shear forces,while post-shear joint surface roughness exhibited a negative correlation with peak shear forces through linear regression analysis.This study contributes to a better understanding of the sliding responses and shear mechanical characteristics of rock joints under dynamic disturbances.
dynamic normal displacementshear strength variationsphase lag phenomenonstick-slip
朱强、尹乾、陶志刚、何满潮、郑博文、靖洪文、任树林、张强、孟波、白东锋、吴赛赛、吴疆宇
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State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Xuzhou 221116,China
State Key Laboratory for Geomechanics&Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China
Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China
CCCC First Highway Survey and Design Research Institute Co.,Ltd.,Xi'an 710075,China
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动态法向位移 剪切强度变化 相位滞后现象 黏滑
National Natural Science Foundation,ChinaNational Natural Science Foundation,ChinaNatural Science Foundation of Jiangsu Province,ChinaHenan Province Science and Technology Key Project,ChinaFundamental Research Funds for the Central Universities,China
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