Experimental study on the slip evolution of planar fractures subjected to cyclic normal stress
Kang Tao1
Wengang Dang2
Xian Liao1
Xingling Li1
1.School of Civil Engineering,Sun Yat-sen University,Zhuhai 519086,China2.School of Civil Engineering,Sun Yat-sen University,Zhuhai 519086,China;Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai 519086,China
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.
机标关键词：evolutionstressnormalstudyslipcyclicexperimentalfractures
论文发表日期：2023-08-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：16( 217-232 )
英文信息