基于断裂力学的用钢板加固的分段式隧道衬砌的界面破坏

IF 2.9 3区 工程技术 Q2 ENGINEERING, CIVIL Frontiers of Structural and Civil Engineering Pub Date : 2024-05-09 DOI:10.1007/s11709-024-1019-9
Yazhen Sun, Yang Yu, Jinchang Wang, Longyan Wang
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引用次数: 0

摘要

用钢板加固的节段式隧道衬砌是世界上广泛使用的一种永久加固方法。现有研究大多假设钢-混凝土界面为理想状态,忽略了非连续变形特征,难以准确分析加固结构的破坏机理。本研究将复合材料界面断裂力学应用于钢板加固的分段式隧道衬砌,并建立了衬砌结构的三维实体非线性数值模型,将扩展有限元法与内聚区模型相结合,以考虑界面的非连续变形特征。结果准确地描述了裂纹的扩展过程,并通过全尺寸试验进行了验证。接着,根据校准模型进行了动态模拟,分析了钢-混凝土界面的滑动破坏和开裂。最后,通过模型试验进一步验证了界面粘结破坏的详细位置。结果表明,界面的开裂破坏和粘结破坏是决定加固结构失稳和破坏的决定性因素。所提出的数值分析在揭示强化复合材料结构的界面破坏机理方面迈出了重要一步。
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Interface failure of segmental tunnel lining strengthened with steel plates based on fracture mechanics

Segmental tunnel lining strengthened with steel plates is widely used worldwide to provide a permanent strengthening method. Most existing studies assume an ideal steel-concrete interface, ignoring discontinuous deformation characteristics, making it difficult to accurately analyze the strengthened structure’s failure mechanism. In this study, interfacial fracture mechanics of composite material was applied to the segmental tunnel lining strengthened with steel plates, and a numerical three-dimensional solid nonlinear model of the lining structure was established, combining the extended finite element method with a cohesive-zone model to account for the discontinuous deformation characteristics of the interface. The results accurately describe the crack propagation process, and are verified by full-scale testing. Next, dynamic simulations based on the calibrated model were conducted to analyze the sliding failure and cracking of the steel-concrete interface. Lastly, detailed location of the interface bonding failure are further verified by model test. The results show that, the cracking failure and bond failure of the interface are the decisive factors determining the instability and failure of the strengthened structure. The proposed numerical analysis is a major step forward in revealing the interface failure mechanism of strengthened composite material structures.

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来源期刊
CiteScore
5.20
自引率
3.30%
发文量
734
期刊介绍: Frontiers of Structural and Civil Engineering is an international journal that publishes original research papers, review articles and case studies related to civil and structural engineering. Topics include but are not limited to the latest developments in building and bridge structures, geotechnical engineering, hydraulic engineering, coastal engineering, and transport engineering. Case studies that demonstrate the successful applications of cutting-edge research technologies are welcome. The journal also promotes and publishes interdisciplinary research and applications connecting civil engineering and other disciplines, such as bio-, info-, nano- and social sciences and technology. Manuscripts submitted for publication will be subject to a stringent peer review.
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