Influence of crack initiation competition and interaction of cross flaw on the dynamic fracture behavior of granite under biaxial compression

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-01-16 DOI:10.1016/j.tafmec.2025.104850

Tingting Liu , Luyang Ding , Hui Shen , Chang Xiang , Shenghao Yang

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引用次数: 0

Abstract

Flawed rock mass may exhibit complex fracture behavior when subjected to dynamic loads such as blasting or earthquakes. Therefore, understanding the fracture mechanism of rock mass with non-persistent cross flaws under in-situ stress is vital for ensuring safe construction and prolonged operation of deep geotechnical engineering. In this study, dynamic tests under biaxial static loading were conducted with consideration of the effect of the flaw persistency ratio. The fracture toughness was calculated from the digital image correlation (DIC) results to analyze the intrinsic fracture mechanism, failure mode, and microscopic damage morphology. The findings reveal the failure mode of the fractured rock mass has a predictable evolution process according to the spatial geometric characteristics of the cross flaws. At the moment of crack initiation, the stress intensity factor (SIF) value of mode-Ⅰ crack at the main flaw tip is considerably greater than that of the secondary flaw tip. In the crack propagation stage, the stress fields of the second flaw tips of the specimen with different persistency ratios exhibit disparate responses to the fracture behavior of the main flaw tip. Microcracks tend to aggregate at the ends of typical shear failure zones under tensile-shear stress. The obtained results can provide a useful reference for the safe construction of underground engineering.

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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.