Investigations on mechanical behavior of longitudinal joints in segmental tunnel linings reinforced with epoxy bonded-bolted steel plates

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-05-06 DOI:10.1016/j.tust.2025.106724

Xian Liu , Jianyu Hong , Zhen Liu

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引用次数: 0

Abstract

For shield tunnel linings reinforced with epoxy bonded-bolted steel plates, the mechanical behavior of longitudinal joints is a key factor affecting the overall load-bearing capacity and durability of the structure. However, current research and design efforts mostly remain at the conceptual or qualitative analysis stage, with insufficient consideration of the collaborative mechanical behavior of components such as steel plates, epoxy adhesive, and chemical anchors. The corresponding design method is also missing. Therefore, to thoroughly investigate the mechanical behavior and failure process of longitudinal joints reinforced with epoxy bonded-bolted steel plates and to quantify the contributions of steel plates, epoxy adhesive, and chemical anchors to the joint’s mechanical performance, in this study, full-scale joint tests under positive and negative bending moments and develop three-dimensional refined nonlinear finite element models of the longitudinal joints are conducted. By conducting parameter attribution analysis, the key factors affecting the macroscopic mechanical performance indicators of the joint are identified, the roles of steel plates, epoxy adhesive, and chemical anchors are also revealed. The research provides a theoretical basis for the design and application of shield tunnel structures reinforced with epoxy bonded-bolted steel plates. The study results are as follows: (1) The failure of longitudinal joints reinforced with epoxy bonded-bolted steel plates can be divided into three stages: elastic stage, stress redistribution stage, and ultimate failure stage. (2) The bearing capacity of the reinforced joints is mainly determined by the dimensions of the steel plates and the shear performance of the epoxy adhesive interface, while stiffness is determined by the steel plate dimensions. Ductility depends on the steel plate dimensions, epoxy adhesive shear performance, and chemical anchors. (3) Under positive bending moments, the steel plates share the stress of the bolts, while under negative bending moments, they strengthen the intrados concrete of the joint. (4) The epoxy adhesive connects the steel plates and longitudinal joint, with tension-shear composite failure occurring under positive bending moments and compression-shear composite failure under negative bending moments. (5) After the epoxy adhesive interface fails, the chemical anchors promptly share the interface load, providing additional safety reserves.

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环氧粘结螺栓连接钢板加固管片隧道衬砌纵向接缝力学性能研究

对于采用环氧粘结螺栓加固钢板的盾构隧道衬砌，纵向接缝的受力性能是影响结构整体承载能力和耐久性的关键因素。然而，目前的研究和设计工作大多停留在概念或定性分析阶段，对钢板、环氧胶粘剂和化学锚等部件的协同力学行为考虑不足。相应的设计方法也缺失。因此，为了深入研究环氧粘结螺栓钢板加固纵向节点的力学行为和破坏过程，量化钢板、环氧胶粘剂和化学锚对节点力学性能的贡献，本研究进行了正弯矩和负弯矩下的全尺寸节点试验，并建立了纵向节点的三维精细非线性有限元模型。通过参数归因分析，确定了影响节点宏观力学性能指标的关键因素，揭示了钢板、环氧胶粘剂、化学锚的作用。研究结果为环氧粘结螺栓加固盾构隧道结构的设计与应用提供了理论依据。研究结果表明：(1)环氧粘结螺栓加固钢板纵缝破坏可分为弹性阶段、应力重分布阶段和极限破坏阶段三个阶段。(2)加筋节点的承载力主要由钢板的尺寸和环氧胶粘剂界面的抗剪性能决定，而刚度则由钢板尺寸决定。延展性取决于钢板尺寸、环氧胶粘剂剪切性能和化学锚。(3)在正弯矩作用下，钢板分担螺栓的应力，在负弯矩作用下，钢板对节点内部混凝土进行加固。(4)钢板与纵缝采用环氧胶粘剂连接，正弯矩作用下出现拉剪复合破坏，负弯矩作用下出现压剪复合破坏。(5)环氧胶粘剂界面失效后，化学锚及时分担界面荷载，提供额外的安全储备。

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来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.