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Sealing performance of a precast tunnel gasketed joint under high hydrostatic pressures: Site investigation and detailed numerical modeling
Tunnelling and Underground Space Technology ( IF 6.9 ) Pub Date : 2021-06-25 , DOI: 10.1016/j.tust.2021.104082
Mingfeng Lei , Binbin Zhu , Chenjie Gong , Wenqi Ding , Linghui Liu

Aiming at the sealant behavior at the engineering scale, this paper first presents a site investigation on the joint responses to reveal the characteristics of probability distribution and the correlations between joint deformations and leakage. A detailed numerical model verified with experimental data, is established to interpret the multi-dimensional variation law of gasket sealing performance subjected to different joint deformation states. The results show that: the sealing performance of a rubber gasket decreases significantly with increasing joint opening, and fluctuates with increasing joint offset. Based on this finding, a new quantitative method for evaluating gasket sealing performance is developed. The sealing performance is divided into “joint opening dominant area” and “joint offset dominant area” according to the degree of influence in terms of joint opening, while the deformation area is further evaluated as “insufficient sealing area (labelled in red) ”, “critical sealing area (labelled in yellow)“ and ”sufficient gasket sealing area (labelled in green)“ according to the influence of joint offset. The results of this study can be beneficial to an improved understanding of the leakage behavior of gasketed joints in high-water pressure shield tunnels.



中文翻译:

高静水压力下预制隧道密封接头的密封性能:现场调查和详细的数值模拟

针对工程尺度的密封胶行为,本文首先对接头响应进行了现场调查,以揭示其概率分布特征以及接头变形与泄漏之间的相关性。建立了经过实验验证的详细数值模型,解释了不同接头变形状态下垫片密封性能的多维变化规律。结果表明:橡胶垫片的密封性能随着接头开度的增大而显着降低,并随着接头偏移量的增大而波动。基于这一发现,开发了一种新的定量评估垫片密封性能的方法。密封性能根据对接头开口的影响程度分为“接头开口优势区”和“接头偏移优势区”,而变形区域进一步评价为“密封不足区(红色标注)”, “临界密封区域(黄色标注)”和“足够的垫片密封区域(绿色标注)”根据接头偏移的影响。这项研究的结果有助于更好地了解高水压盾构隧道中密封接头的渗漏行为。

更新日期:2021-06-28
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