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
Abstract
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.
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.
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