Study on crack propagation laws of two flaws with antarafacial strike lines in rock-like materials

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-08-30 DOI:10.1016/j.tafmec.2025.105205

Jiquan Ma , Shunchuan Wu , Feng Dai , Haiyong Cheng , Jiaxin Wang , Yafan Zhang , Xiaolong Yang

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引用次数: 0

Abstract

The presence of flaws in natural rocks causes significant anisotropy in their strength and failure behavior. To investigate the impact of two flaws with antarafacial strike lines on the mechanical behavior of rocks, this study first conducted uniaxial compression tests using rock-like materials with prefabricated flaws at angles of 0°, 45°, and 90°. Subsequently, double-sided digital image correlation (DIC) and acoustic emission (AE) techniques were employed to analyze the failure characteristics of these specimens under the influence of two flaws at various angles. Finally, particle flow code was utilized to further interpret and validate the experimental results. According to the results, the weakening effects of the nine flaw angle combinations on uniaxial compressive strength and elastic modulus follow the order: two 0° flaws > one 0° flaw combined with one 5° flaw > two 45° flaws > one 0° or 45° flaw combined with one 90° flaw > two 90° flaws. For specimens with prefabricated 0° and 45° flaw combinations, the interaction between flaws is significant, exhibiting a pronounced dilatancy effect upon failure and generating transverse cracks and triangular or trapezoidal failure patterns. Additionally, more cracks are generated when the specimen initially fails, and multiple bursts of AE signals appear. The specimens are most prone to failure at the tips of the 0° flaws, at a certain distance away from these tips, and at the tips of the 45° flaws. Overall, these findings provide valuable insights and guidance for analyzing the failure characteristics of complex three-dimensional flawed rocks.

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类岩材料中两种具有前岩体走向线缺陷的裂纹扩展规律研究

天然岩石中缺陷的存在导致其强度和破坏行为具有明显的各向异性。为了研究具有前岩体走向线的两种缺陷对岩石力学行为的影响，本研究首先在0°、45°和90°角度上使用预制缺陷的类岩石材料进行了单轴压缩试验。随后，利用双面数字图像相关（DIC）和声发射（AE）技术分析了两种缺陷在不同角度影响下试件的破坏特征。最后利用粒子流代码对实验结果进行进一步解释和验证。由结果可知，9种缺陷角度组合对单轴抗压强度和弹性模量的削弱作用顺序为：2个0°缺陷>； 1个0°缺陷+ 1个5°缺陷>； 2个45°缺陷>； 1个0°或45°缺陷+ 1个90°缺陷>；对于预制0°和45°缺陷组合的试样，缺陷之间的相互作用是显著的，在破坏时表现出明显的剪胀效应，并产生横向裂纹和三角形或梯形破坏模式。试样初始破坏时产生较多裂纹，出现多次声发射信号爆发。试样在0°缺陷尖端、距离这些尖端一定距离处和45°缺陷尖端处最容易失效。总的来说，这些发现为分析复杂三维裂隙岩石的破坏特征提供了有价值的见解和指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.