Experimental study on the slip evolution of planar fractures subjected to cyclic normal stress

International Journal of Coal Science & Technology

Research

Kang Tao¹  Xingling Li¹  Xian Liao¹  Wengang Dang² 

[1] School of Civil Engineering, Sun Yat-sen University, 519086, Zhuhai, China;School of Civil Engineering, Sun Yat-sen University, 519086, Zhuhai, China;Southern Marine Science and Engineering Guangdong Laboratory, 519086, Zhuhai, China;

关键词: Rock fracture;    Frictional rupture;    Cyclic normal stress;    Slip transition;    Rate and state friction law;   

DOI  :  10.1007/s40789-023-00654-w

 received in 2023-05-27, accepted in 2023-09-27,  发布年份 2023

来源: Springer

【 摘 要 】

The frictional rupture mechanisms of rock discontinuities considering the dynamic load disturbance still remain unclear. This paper investigates the transitional behaviors of slip events happened on a planar granite fracture under cyclic normal stress with different oscillation amplitudes. The experimental results show that the activations of fast slips always correlate with unloading of normal stress. Besides, the intensive normal stress oscillation can weaken the shear strength which is recoverable when the normal stress return to constant. The rupture patterns are quantified by stress drop, slip length and slip velocity. With the effect of small oscillation amplitudes, the slip events show chaotic shapes, compared to the regular and predictable style under constant normal stress. When the amplitude is large enough, the big and small slip events emerge alternately, showing a compound slip style. Large amplitude of the cyclic normal stress also widens the interval differences of the slip events. This work provides experimental supports for a convincible link between the dynamic stress disturbance and the slip behavior of rock fractures.

【 授权许可】

CC BY   
© The Author(s) 2023

【 图 表 】

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