Rock damage and fracture characteristics considering the interaction between holes and joints

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-08-17 DOI:10.1016/j.tafmec.2024.104628

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引用次数: 0

Abstract

The work studied the damage and fracture characteristics of granite samples with circular holes and parallel fractures of different lengths under uniaxial compression conditions. Acoustic emission (AE) monitoring and digital image correlation (DIC) were used to analyze the dynamic changes of AE parameters, the evolution characteristics of the deformation field on the sample surface, and the correlation between the fractal dimension and the fracture geometry parameters. A computational model was proposed for evaluating the intensity factor of the fracture tip in a double-fracture structure with holes. The interaction between the fractures was considered to reveal the complex law of the intensity factor and the fracturing angle with the fracture geometry. The changes in AE parameters and fractal dimension indicated the influence of fracture extension on the damage mode of samples. Besides, the fracture length affected the micro-fracture behavior. The surface displacement and strain characteristics of samples revealed the modulation effect of the fracture length on the failure mode. The inclination angle, length, holes, and size of the fractures’ friction coefficient significantly affected the evolution of the intensity factor, which in turn regulated the changes in the fracture angle. The work offers a novel quantitative analytical approach and a theoretical framework for comprehending the damage and failure mechanisms of porous and fractured rocks through extensive experimentation and theoretical analysis. It holds significant practical relevance in geological engineering, mining, and tunnel construction.

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考虑到孔洞和接缝之间的相互作用的岩石破坏和断裂特征

研究了花岗岩样品在单轴压缩条件下的损伤和断裂特征，样品上有圆形孔洞和不同长度的平行断口。利用声发射（AE）监测和数字图像相关（DIC）分析了 AE 参数的动态变化、样品表面变形场的演变特征以及分形维度与断口几何参数之间的相关性。提出了一个计算模型，用于评估带孔双断裂结构中断裂尖端的强度因子。考虑了断口之间的相互作用，揭示了强度因子和断裂角与断口几何形状之间的复杂规律。AE 参数和断口尺寸的变化表明了断口扩展对样品破坏模式的影响。此外，断裂长度也会影响微断裂行为。样品的表面位移和应变特征显示了断裂长度对破坏模式的调制作用。断口的倾斜角、长度、孔洞和摩擦系数的大小显著影响强度因子的变化，而强度因子的变化又反过来调节断裂角的变化。该研究通过大量的实验和理论分析，为理解多孔和断裂岩石的破坏和失效机制提供了一种新的定量分析方法和理论框架。它在地质工程、采矿和隧道建设方面具有重要的现实意义。

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.