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A novel A-star algorithm-based approach to predicting the sealant performance of shield tunnel’s gasketed joints
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-13 , DOI: 10.1016/j.tust.2025.106379
Jiachong Xie, Neng Wang, Xin Huang, Qinghua Lei, Climent Molins

Joint leakage is one of the major problems for shield tunnels. This paper proposes a novel approach to assessing the sealant performance of gasketed joints based on the A-star search algorithm. By treating the contact surface of gaskets as the search space of the optimal leakage path, the water leakage process is modeled as a path optimization task informed by the nonuniform distribution of contact stresses. This new approach determines the optimal leakage path together with the associated leakage threshold. The validity of the proposed algorithm is demonstrated through a comparison with experimental test results, followed by a comprehensive parametric study of joint opening, offset, and self-sealing effect. The results elucidate the dominant role of localized contact in sealant performance, which is notably affected by joint deformation. Scenarios of large offsets and small openings exhibit abnormal increases in leakage thresholds and elongated leakage paths due to additional gasket-to-groove contacts and increased heterogeneity of contact stress distribution. The self-sealing process exerts a pronounced nonlinear impact on the sealant performance of gasketed joints, leading to a rapid escalation of the leakage threshold when the lateral water pressure surpasses 0.5 MPa. Additionally, lateral pressurization induces nonuniform distribution of non-conductive regions, resulting in convoluted optimal leakage paths.

中文翻译:


一种基于 A-star 算法的新型方法,用于预测盾构隧道垫片接头的密封剂性能



接缝泄漏是盾构隧道的主要问题之一。本文提出了一种基于 A-star 搜索算法的评估垫片接头密封剂性能的新方法。通过将垫片的接触表面视为最佳泄漏路径的搜索空间,将漏水过程建模为由接触应力不均匀分布告知的路径优化任务。这种新方法确定了最佳泄漏路径以及相关的泄漏阈值。通过与实验测试结果的比较,然后对接头打开、偏移和自密封效应进行全面的参数研究,证明了所提算法的有效性。结果阐明了局部接触在密封胶性能中的主导作用,密封胶性能明显受到接头变形的影响。由于垫圈与凹槽的额外接触和接触应力分布的异质性增加,大偏移和小开口的情况表现出泄漏阈值的异常增加和拉长的泄漏路径。自密封过程对垫片接头的密封胶性能产生明显的非线性影响,当横向水压超过 0.5 MPa 时,导致泄漏阈值迅速上升。此外,横向加压会导致非导电区域的不均匀分布,从而导致错综复杂的最佳泄漏路径。
更新日期:2025-01-13
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