盾尾密封系统防水失效影响因素试验研究
蒋沛峰
Experimental Study on Factors Affecting Waterproof Failure of Shield Tail Sealing System
JIANG Peifeng
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作者信息:中铁十七局集团第四工程有限公司， 401121， 重庆
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Affiliation:China Railway No.17 Bureau Group No.4 Engineering Co., Ltd., 401121, Chongqing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.04.045
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中图分类号/CLCN:U455.3+9
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栏目/Col:应用技术
摘要:
［目的］盾尾密封失效是盾构施工过程中的高风险因素，盾尾密封性能严重影响施工安全和施工进度。目前相关研究尚未阐明盾尾密封系统防水机理，因此需对盾尾密封系统防水失效影响因素进行针对性研究。［方法］以盾尾密封系统为研究对象，自主设计盾尾密封系统防水失效试验测试方法及试验装置，对盾尾密封系统防水失效特性及其重要影响因素进行研究。［结果及结论］盾尾密封系统防水失效时，渗流通道附近的油脂会发生乳化现象；盾尾间隙、盾尾刷刷丝长度等参数对盾尾密封防水失效的影响显著，为保证0.6 MPa的正向设计防水压力，当选用盾尾刷刷丝长度分别为175、200、275、300 mm 时，建议盾尾间隙的上限值分别不大于 30.0、34.3、37.6、48.8 mm；当设计盾尾间隙分别为 30、40、50 mm 及以上时，建议选用的盾尾刷刷丝长度分别不小于175、275、300 mm。
Abstracts:
［Objective］ Shield tail seal failure is a high risk factor in shield construction process, and shield tail sealing performance seriously affects construction safety and construction schedule. At present, the waterproof mechanism of the shield tail seal system has not yet been clarified in relevant researches, so it is necessary to conduct targeted research on the factors affecting the failure of the shield tail seal system. ［Method］ Taking the shield tail sealing system as the research object, the test method and equipment for its waterproof failure test are independently designed. Waterproof failure characteristics of the shield tail sealing system and its important influencing factors are studied. ［Result & Conclusion］ When the waterproof function of shield tail sealing system fails, the grease near the seepage channel will emulsify; shield tail clearance, shield tail brush wire length and other parameters all have a significant impact on the waterproof failure of shield tail seal. To ensure the positive design waterproof pressure of 0.6 MPa, when the shield tail brush wire length is selected to be 175, 200, 275, and 300 mm, respectively, it is recommended that the upper limits of the shield tail clearance should not be greater than 30.0, 34.3, 37.6, and 48.8 mm, respectively; when the design shield tail clearance is 30, 40, 50 mm and above, it is recommended that the selected shield tail brush wire length is not less than 175, 275, 300 mm, respectively.
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