Study on the interaction mechanisms between the fissure arrays and circular tunnels by physical experiment and meshless numerical method

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-03-20 DOI:10.1016/j.tafmec.2025.104935

Xueying Hu , Shibing Huang , Shuyang Yu , Yifei Li , Xiangyu Wang

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引用次数: 0

Abstract

Fissure arrays, which commonly develop in surrounding rock masses, exert a significant adverse influence on tunnel stability. However, current research on the interactions between fissure arrays and tunnels are limited. In this study, specimens with fissure arrays and central holes are prepared using sand-three-dimensional printing (S-3DP) technology, with variations in fissure angles, lengths, and numbers. The crack propagation experiments are subsequently carried out, in which the propagation of fissures is monitored and recorded by employing Digital Image Correlation (DIC) methodology. Then, the developed smooth particle dynamics method is used to simulate and analyze crack evolution processes as a comparison. The results demonstrate that an increase in fissure inclination angle leads to an enhancement in specimen peak strength, whereas increases in fissure length and number result in a reduction in peak strength. Four basic crack types, namely tensile cracks (T-Ⅰ and T-ⅠⅠ), shear cracks (S), and tensile-shear mixed cracks (TS), are quantitatively identified using DIC technology. In addition, the rupture modes can be categorized into four distinct types: horizontal splitting damage mode, stepped damage mode, “Y”-shaped damage mode, and tensile-shear mixed damage mode. Distributions of tensile and compressive stress concentration areas should be responsible for the crack initiation and the final failure modes, because these stress concentration areas not only trigger the initial formation of cracks, but also guide the crack propagation paths. This study provides novel insights into the fracture mechanisms of tunnels containing fissure arrays, while also offering valuable references for the safe construction and long-term operation of tunnel engineering projects.

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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.