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

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS
Kang Tao, Wengang Dang, Xian Liao, Xingling Li
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引用次数: 0

Abstract

Abstract 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.

Abstract Image

循环正应力作用下平面裂缝滑移演化的实验研究
考虑动荷载扰动的岩体结构面摩擦破裂机制尚不清楚。本文研究了在不同振荡幅值的循环正应力作用下,平面花岗岩断裂上发生滑动事件的过渡行为。实验结果表明,快滑块的激活总是与法向应力的卸载有关。此外,剧烈的法向应力振荡会削弱抗剪强度,当法向应力恢复到恒定时,抗剪强度可恢复。破裂模式通过应力降、滑移长度和滑移速度来量化。在较小的振荡幅值的作用下,滑移事件呈现出混乱的形状,而在恒定的正应力下,滑移事件呈现出规则和可预测的形式。当振幅足够大时,大小滑动事件交替出现,表现为复合滑动类型。大的循环正应力幅值也扩大了滑移事件的间隔差。这一工作为在动应力扰动与岩石裂隙滑移行为之间建立可信的联系提供了实验支持。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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