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  2025, Vol. 44 Issue (5): 1146-1165    DOI: 10.3724/1000-6915.jrme.2024.0771
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Study on the dynamic characteristics of rock discontinuities under high cyclic shear rate
ZHANG Qingzhao1,2,TONG Zehao1,2,SHI Zhenming1,2,XIE Kelu1,2,3,LUO Zejun1,2,4
(1. Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China;2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;3. Shandong Zhongjian Urban Development Co.,Ltd.,Jinan,Shandong 250014,China;
4. Shanghai Chengtou Group Co.,Ltd.,Shanghai 200020,China)
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Abstract  The natural occurrence of numerous discontinuities in rock masses makes them prone to significant displacements and friction degradation under external dynamic forces,thereby increasing the risk of instability. To investigate the mechanical properties of jointed rock masses under cyclic dynamic conditions,this study focuses on natural red sandstone and explores the shear mechanical characteristics of rock discontinuities under cyclic shearing,with a specific emphasis on the dynamic properties of rock masses by setting a high shear rate. The evolution of shear stress and normal displacement during cyclic shearing is analyzed,and a peak shear strength prediction model for structural planes is established,incorporating the number of cyclic shear cycles based on plastic work theory. The results show that:(1) The applied cyclic shear rate (2 mm/s) reaches the dynamic range,and in comparison to quasi-static direct shear tests,this rate more accurately simulates the shear mechanical behavior of discontinuities under dynamic conditions. (2) During cyclic shearing,the number of cycles,type of discontinuities,and normal stress significantly influence the evolution of shear stress on the discontinuities. Normal displacement exhibits distinct patterns at shear displacements of 0 mm and ±5 mm. As the number of cycles increases,normal displacement gradually decreases,indicating a reduction in dilatancy and an increase in compaction. (3) A peak shear strength prediction model that accounts for the number of cyclic shear cycles is established,with an overall error of approximately 10% compared to actual conditions,demonstrating good applicability. The research findings provide theoretical support for the safety and stability assessment of rock engineering under dynamic disturbances.
Key wordsrock mechanics      high shear rate      rock discontinuities      cyclic shear      mechanical properties      strength prediction model     
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Articles by authors
ZHANG Qingzhao1
2
TONG Zehao1
2
SHI Zhenming1
2
XIE Kelu1
2
3
LUO Zejun1
2
4
Cite this article:   
ZHANG Qingzhao1,2,TONG Zehao1, et al. Study on the dynamic characteristics of rock discontinuities under high cyclic shear rate[J]. , 2025, 44(5): 1146-1165.
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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0771      OR      https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I5/1146
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