Cyclic fatigue responses of double fissure-contained marble: Insights from mechanical responses, energy conversion and hysteresis characteristics

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-11-06 DOI:10.1016/j.tafmec.2024.104750

Yu Wang , Linlin Chen , Yunfeng Wu , Xuefeng Yi

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Abstract

The intermittent fissures are widely distributed in rock mass, rock bridge segment among the fissures are crucial to the mechanical properties and stability of rock mass. The static mechanical behaviors of fissure-contained rock were well understood, yet the fatigue mechanical properties were poorly investigated. This work aims to reveal the influence of rock bridge length on rock mechanical responses, energy dissipation and hysteresis characteristics in lab-scale. Marble samples with rock bridge length (RBL) of 10, 20, 30, and 40 mm were prefabricated as parallel pattern, and they are subjected to multi-level fatigue loading paths. Testing results show that the rock bridge between the fissures resists rock deformation and the terminal volumetric strain decreases with increasing RBL. In addition, the hysteresis energy density and damage evolution are influenced by the rock bridge length. The strain energy density development aligns with deformation pattern results. Deterioration in the rock bridge structure causes reduced capacity and higher energy consumption. More energy is required to drive damage progression and crack connectivity in rocks with a larger RBL. Ultimately, two hysteresis indices are introduced to characterize fatigue damage evolution. These indices exhibit nearly opposing trends throughout the loading process. It is proposed that extending the rock bridge length results in a roughly linear trend for both hysteresis indices.

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含双裂隙大理石的循环疲劳响应：从机械响应、能量转换和滞后特性看问题

间歇性裂隙广泛分布于岩体中，裂隙间的岩桥段对岩体的力学性能和稳定性至关重要。人们对含裂隙岩石的静态力学行为了解较多，但对其疲劳力学性能的研究较少。本研究旨在实验室尺度上揭示岩桥长度对岩石力学响应、能量耗散和滞后特性的影响。将岩桥长度（RBL）为 10、20、30 和 40 毫米的大理石样品预制成平行模式，并对其进行多级疲劳加载。测试结果表明，裂隙间的岩桥能抵抗岩石变形，终端体积应变随 RBL 的增加而减小。此外，滞后能量密度和损伤演变也受岩桥长度的影响。应变能量密度的发展与变形模式的结果一致。岩桥结构的恶化会导致承载能力降低和能量消耗增加。在 RBL 较大的岩石中，需要更多的能量来推动损伤发展和裂缝连通。最终，引入了两个滞后指数来描述疲劳损伤的演变。这些指数在整个加载过程中表现出几乎相反的趋势。有人提出，延长岩桥长度会导致两个滞后指数呈现大致线性的趋势。

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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.