Mechanical properties and failure mechanism of limestone containing notches subjected to uniaxial compression: An experimental and numerical study

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-09-29 DOI:10.1016/j.tafmec.2025.105266

Peiyao Li , Xinrong Liu , Xueyan Guo , Xinyang Luo , Gen Wang

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引用次数: 0

Abstract

The formation of rock cavities influences the cracking behavior of rock and threatens the stability of slopes. To address this issue, mechanical tests and numerical simulation were conducted to investigate the failure mechanism and mechanical properties of rock containing notches. Firstly, uniaxial compression tests were carried out to clarify the failure process of rock specimens and analyze the influence of the notch geometric parameters (height and inclination) on the mechanical properties of rocks. Meanwhile, based on the test data, the energy evolution of notched rocks during the loading process was elucidated. Furthermore, PFC simulation was employed to reveal the damage evolution of notched rock specimens; combined with the moment tensor theory, the acoustic emission characteristics during rock failure were analyzed in depth. The research results indicate that notches significantly reduce the strength and stiffness of intact rocks and simultaneously change stress distribution, leading to obvious stress concentration around notches. The moment magnitudes of acoustic emission events generated near the notches are significantly higher than those of acoustic emission events at the crack tips. During rock failure process, tensile and implosive cracks predominate, while the proportion of shear cracks is relatively low (approximately 20 %). In addition, changes in the inclination angle and height of the notches also affect the mechanical properties (strength and stiffness) and failure characteristics of the rocks. Finally, implications and limitations of this study for rock engineering are discussed. Overall, this study provides a comprehensive insight into the mechanical properties and failure mechanism of notched rocks under uniaxial compression.

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含缺口石灰岩在单轴压缩下的力学特性与破坏机制：实验与数值研究

岩洞的形成影响着岩石的开裂行为，威胁着边坡的稳定。针对这一问题，通过力学试验和数值模拟研究了含缺口岩石的破坏机理和力学特性。首先进行单轴压缩试验，明确岩石试件的破坏过程，分析缺口几何参数（高度和倾角）对岩石力学性能的影响；同时，根据试验数据，阐明了缺口岩在加载过程中的能量演化规律。此外，采用PFC模拟揭示了缺口岩石试件的损伤演化过程；结合矩张量理论，对岩石破坏过程中的声发射特征进行了深入分析。研究结果表明，缺口显著降低了完整岩石的强度和刚度，同时改变了应力分布，导致缺口周围存在明显的应力集中。缺口附近产生的声发射事件的矩量显著高于裂纹尖端的声发射事件。岩石破坏过程中以拉伸和内爆裂缝为主，剪切裂缝所占比例相对较低（约20%）。此外，缺口倾角和高度的变化也会影响岩石的力学特性（强度和刚度）和破坏特征。最后，讨论了本研究对岩石工程的启示和局限性。总体而言，本研究对缺口岩在单轴压缩下的力学特性和破坏机制提供了全面的认识。

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.