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Waterproofing enhancement mechanism of the double sealing gaskets: Experimental test and theoretical analysis
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-09 , DOI: 10.1016/j.tust.2025.106371
Hua-Yong Li, Huai-Na Wu, Dong-Lin Feng, Lei Liu, Qing-long Cui, Ren-Peng Chen

The waterproofing system of the double gaskets has been employed in shield tunnels with large diameters (>10 m) and high water pressures (>1.5 MPa), but the waterproof enhancement mechanism of this system has not been clarified. In this study, the enhancement in waterproof performance under the equal and unequal joint openings was analyzed through the waterproofing test. A fluid–solid coupled numerical model of the double gaskets was established to reveal the waterproof failure pattern and analyze the variations of the contact stress. On this basis, a velocity-seepage coupled analytical model of the double gaskets was derived to quantify the difference of the water pressure and seepage velocity during the entire failure process. The waterproofing enhancement mechanism of the double gaskets was revealed via the proposed model. The results indicate that compared to the single gasket, the waterproof performances of the double gaskets are enhanced by 15 % to 280 %. The waterproof failure pattern of the double gaskets can be divided into four stages during the whole failure process. The waterproofing enhancement mechanism of the double gaskets is attributed to the difference of the water pressure between the inner and outer cavities due to the presence of the outer gasket so that a higher external water pressure is required to cause the failure of the waterproof system of the double gaskets. The results of this study can be a great benefit for the waterproof design of the double gaskets.

中文翻译:


双重密封垫片的防水增强机理:实验试验和理论分析



双垫片的防水系统已应用于大直径 (x3E10 m) 和高水压 (x3E1.5 MPa) 的盾构隧道,但该系统的防水增强机制尚未阐明。在本研究中,通过防水测试分析了相等和不等接缝开口下防水性能的增强。建立了双垫片的流固耦合数值模型,揭示了防水破坏模式并分析了接触应力的变化。在此基础上,推导了双垫片的速度-渗流耦合解析模型,量化了整个破坏过程中水压和渗流速度的差异。通过拟议的模型揭示了双垫片的防水增强机制。结果表明,与单垫片相比,双垫片的防水性能提高了 15 % 至 280 %。在整个失效过程中,双垫片的防水失效模式可分为四个阶段。双垫圈的防水增强机制归因于由于外部垫圈的存在而导致的内腔和外腔之间的水压差,因此需要更高的外部水压来导致双垫圈的防水系统失效。这项研究的结果对双垫圈的防水设计有很大的好处。
更新日期:2025-01-09
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