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IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis Pub Date : 2025-03-18 DOI:10.1016/j.engfailanal.2025.109541

Yili Zhou , Kun Feng , Jialin Li , Jiaqi Li , Wenqi Guo , Ruoyang Tang , Mingqing Xiao , Chuan He

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引用次数: 0

摘要

作为盾构隧道衬砌中最薄弱的部分，节段连接需要对其损伤演变和失效机理进行深入分析，从而为隧道承载能力提供重要依据。针对海泰长江隧道中使用的由一个 DDCI 连接器（由两个 D 部件、一个 C 部件和一个 I 部件组成）和三个倾斜螺栓组成的新型分段接头，进行了一系列全尺寸加载实验，以研究分段接头在下垂弯矩（SBM）和滞后弯矩（HBM）作用下的破坏特征。本研究采用数字图像相关（DIC）和声发射（AE）技术来研究节段连接的破坏过程、破坏机理和力学性能。结果表明，在 SBM 和 HBM 作用下，接头的变形和损坏过程可明显分为四个阶段。在进入第四个变形阶段后，损伤迅速增加，导致 AE b 值急剧下降。在 SBM 条件下，接头主要因剪切裂缝而发生压缩-剪切破坏，而在 HBM 条件下，拉伸裂缝大幅增加。在 SBM 条件下，接头的破坏特征包括受压区域的混凝土破坏和 DDCI 连接器的明显弯曲。而在 HBM 条件下，破坏特征包括受压区域的混凝土破坏、DDCI 连接器附近的混凝土破坏以及 DDCI 连接器锚固钢筋的断裂。

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Failure analysis of segmental joint with DDCI connector and bolt under ultimate bending load based on DIC and AE

As the weakest parts of the shield tunnel linings, segmental joints require a thorough analysis of their damage evolution and failure mechanisms, which offer crucial insights for tunnel carrying capacity. For a new type of segmental joint consisting of a DDCI connector (consists of two D components, a C component and an I component) and three inclined bolts used in the Haitai Yangtze River Tunnel, a sequence of full-scale loading experiments was executed to investigate the failure characteristics of the segmental joints under sagging bending moment (SBM) and hogging bending moment (HBM). Digital image correlation (DIC) and acoustic emission (AE) were utilized in this study to investigate the damage process, failure mechanism, and mechanical properties of the segmental joint. The results indicate that the deformation and damage processes of the joint under SBM and HBM can be distinctly categorized into four stages. Upon entering the fourth deformation stage, a rapid increase in damage leads to a sharp decline in AE b-value. The joint primarily experiences compression-shear failure under SBM due to shear cracks, whereas tension cracks show a substantial rise under HBM. Under SBM, the failure characteristics of the joint involve concrete failure in the compressed region and significant bending of DDCI connector. In contrast, under HBM, the failure characteristics include concrete failure in the compressed region, damage to the concrete near the DDCI connector and fracture of the anchor rebars of the DDCI connector.

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来源期刊

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.