盾尾密封油脂防水密封性能评价指标的相关性分析
郭世情
Correlation Analysis of Evaluation Indicators for Shield Tail Sealing Grease Waterproof Performance
GUO Shiqing
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作者信息:中国铁建股份有限公司南京地铁9号线一期工程施工总承包， 210019， 南京
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Affiliation:Nanjing Metro Line 9 Project Phase I General Contract, China Railway Construction Co., Ltd., 210019, Nanjing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.04.034
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
［目的］盾尾油脂的性能对盾尾防水密封效果有显著的影响。盾尾油脂的性能检测指标较多，但这些指标与盾尾防水性能的关系尚未阐明，需对油脂各检测指标与防水性能之间的关系展开研究。［方法］选取了4种典型的盾尾油脂材料，分别进行了泵送性试验、稠度试验及耐水压密封性试验，获取了4种油脂的泵送量、锥入深度、保压时间及防水失效压力等4个性能指标的测试数据。基于自主设计的盾尾防水性能试验装置，开展了盾尾油脂的防水性能试验。采用皮尔逊相关系数法，分析了这4个性能指标与防水性能的相关性。［结果及结论］具有长纤维的油脂可以抵抗一定的应力，且较好的保压性能。不同盾尾油脂的防水失效压力有较大差异，其防水失效压力在0.41~0.70 MPa之间，并不是所有盾尾油脂都能满足0.60 MPa的设计防水压力，在油脂选型时应对油脂的性能进行检测。锥入深度与耐水压密封性、锥入深度与防水失效压力之间均呈高度负相关。
Abstracts:
［Objective］ The performance of shield tail grease significantly influences the effectiveness of the shield tail waterproof seal. While there are numerous performance indicators for shield tail grease, the relationship between these indicators and the waterproof performance of the shield tail is not yet clarified. It is essential to conduct research on the correlation between various grease testing indicators and waterproof performance. ［Method］ Four typical shield tail grease materials are selected for pumpability tests, consistency tests, and water pressure sealing tests. Test data for pump delivery, penetration depth, holding pressure time, and waterproof failure pressure are obtained for the four types. Using a self-designed shield tail waterproof performance test device, waterproof performance tests for shield tail grease are conducted. The Pearson correlation coefficient method is employed to analyze the correlation between the four performance indicators and waterproof performance. ［Result & Conclusion］ Grease with long fibers can resist certain stresses and exhibit good pressure-holding performance. There is a significant difference in the waterproof failure pressure of different shield tail greases, with the pressure ranging from 0.41 and 0.70 MPa. Not all shield tail greases can meet the design waterproof pressure of 0.60 MPa, and grease performance testing should be considered during grease selection. The penetration depth shows a highly negative correlation with water pressure sealing performance and waterproof failure pressure.
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