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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采用物理实验和无网格数值方法研究裂缝阵列与圆形隧道的相互作用机理

裂隙阵列在围岩中普遍发育，对隧道的稳定性有很大的不利影响。然而，目前对裂缝阵列与隧道相互作用的研究还很有限。在这项研究中，使用砂三维打印（S-3DP）技术制备了具有裂缝阵列和中心孔的样品，并改变了裂缝角度、长度和数量。随后进行了裂纹扩展实验，采用数字图像相关（DIC）方法对裂纹扩展进行了监测和记录。然后，采用所建立的光滑颗粒动力学方法对裂纹演化过程进行了模拟和分析，并进行了对比。结果表明：随着裂隙倾角的增大，试样峰值强度增大，而随着裂隙长度和数目的增加，试样峰值强度减小；利用DIC技术定量识别了拉伸裂纹（T-Ⅰ和T-ⅠⅠ）、剪切裂纹(S)和拉伸-剪切混合裂纹（TS）四种基本裂纹类型。破坏模式可分为水平劈裂破坏模式、阶梯破坏模式、“Y”型破坏模式和拉剪混合破坏模式四种。拉伸应力集中区和压应力集中区的分布对裂纹的起裂和最终破坏模式负责，因为这些应力集中区不仅触发了裂纹的初始形成，而且还引导了裂纹的扩展路径。本研究对含裂隙阵列隧道的断裂机理提供了新的认识，同时也为隧道工程项目的安全施工和长期运行提供了有价值的参考。

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.