| 沉管隧道柔性接头压缩性能研究 |
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| 引用本文： | 禹海涛,萧文浩,赵旭,袁勇,柴瑞,刘洪洲.沉管隧道柔性接头压缩性能研究[J].中国公路学报,2019,32(5):115-122,180. |
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| 作者姓名： | 禹海涛 萧文浩 赵旭 袁勇 柴瑞 刘洪洲 |
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| 作者单位： | 1. 同济大学 岩土及地下工程教育部重点实验室, 上海 200092;2. 北京交通大学 城市地下工程教育部重点实验室, 北京 100044;3. 根特大学 结构工程系, 东弗兰德根特 9000;4. 北京工业大学 城市与工程安全减灾省部共建教育部重点实验室, 北京 100124;5. 同济大学 土木工程防灾国家重点实验室, 上海 200092;6. 港珠澳大桥管理局, 广东 珠海 519015;7. 中交公路规划设计院有限公司, 北京 100088 |
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| 基金项目： | 国家重点研发计划项目（2018YFC0809602，2018YFC1504305，2017YFC1500703）；国家自然科学基金项目（51678438，41672289）；上海市青年科技启明星计划项目（17QC1400500）；上海市科学技术委员会重点支撑项目（16DZ1201904，18DZ1205103）；城市地下工程教育部重点实验室开放基金项目（TUE2018-04） |
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| 摘 要： | 柔性管节接头是沉管隧道的重要组成部分,接头的压缩性能决定了沉管接头的水密性能及安全性,但目前针对沉管隧道柔性接头压缩性能的研究相对缺乏,接头压缩性能参数的取值缺乏试验结果的支撑。基于此,以港珠澳大桥沉管隧道为研究背景,设计了几何比尺为1∶10的隧道管节和接头模型,并进行了大比尺结构试验和止水带材性试验。通过对沉管隧道管节柔性接头逐级施加轴向荷载,试验获得了接头轴向位移随轴向荷载的变化曲线,并与止水带材性试验结果进行了对比分析,揭示了柔性接头的非线性压缩性能:接头压缩性能受GINA止水带自身压缩性能影响;相比材性试验,结构试验结果中接头压缩量普遍偏小2～3 mm,相对差异可达21%。为了进一步验证试验结果,分别建立了二维和三维止水带有限元模型,通过对比试验结果与有限元计算结果,分析并量化了试验中支座摩擦、止水带长度、形状及其横向约束等对试验结果的影响规律。量化分析结果显示,支座摩擦、止水带长度及横向约束对试验结果影响较小,可忽略不计,但止水带纵向尺寸对结构压缩性能影响较为显著,结果相差最大达到8.8%。最后基于试验结果提出了一种可用于模拟沉管接头压缩性能的简化力学计算模型,亦可应用于其他柔性接头的轴向力学分析。
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| 关 键 词： | 隧道工程 柔性接头 结构试验 压缩性能 力学模型 |
| 收稿时间： | 2018-03-04 |
Compression Performance of Flexible Joints in Immersed Tunnels |
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| YU Hai-tao,XIAO Wen-hao,ZHAO Xu,YUAN Yong,CHAI Rui,LIU Hong-zhou.Compression Performance of Flexible Joints in Immersed Tunnels[J].China Journal of Highway and Transport,2019,32(5):115-122,180. |
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| Authors: | YU Hai-tao XIAO Wen-hao ZHAO Xu YUAN Yong CHAI Rui LIU Hong-zhou |
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| Affiliation: | (Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;Key Laboratory of Urban Underground Engineering of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China;Department of Structural Engineering,Ghent University,Gent 9000,East-Flander,Belgium;Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;State Laboratory of Disaster Reduction of Civil Engineering,Tongji Univers让y,Shanghai200092,China;Hongkong-Zhuhai-Macao Bridge Authority,Zhuhai 519015,Guangdong.China;CCCC Highway Consultants CO.,Ltd.,Beijing 100088,China) |
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| Abstract: | Flexible immersion joints are one of the most important components in immersed tunnels, and their compression performance determines the water-proofing capability and structural safety of the joints. However, current research on the compression behavior of immersion joints is relatively insufficient, and more experiments are needed on the related parameter to support its real-life application. Taking an immersed tunnel in the Hong Kong-Zhuhai-Macau link as a case study, the models of the tunnel element and immersion joint with a geometric scale ratio of 1/10 were designed, followed by a large-scale experiment as well as the testing of the mechanical properties of the rubber. The axial force-compression behaviors of the immersion joints were studied by applying an axial force to the joint, and the structural and material test results were compared. The results show the non-linear behavior of the immersion joint. The compression performance of the joint is affected by the compression property of the GINA rubber. The results of the structural tests are generally 2-3 mm lower than those of the mechanical property tests, the relative difference being 21%. In order to verify the experimental results, both two-dimensional and three-dimensional rubber numerical models were established. A comparison of the experimental and numerical results was undertaken to analyze the effects of friction force between the element and ground support, length, shape, and transversal restraint of the rubber and quantify them in detail. The results indicate that the effects of friction force, length, and transversal restraint of the rubber are relatively small and can be ignored. However, the longitudinal dimension exerts a significant influence, resulting in a maximum difference of 8.8%. Finally, a simplified mechanical model was proposed to simulate the compression behaviors of the immersion joints in accordance with the test results. The results show that it can also be applied to axial mechanical analyses of other flexible joints. |
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| Keywords: | tunnel engineering flexible joint structural test compression performance mechanical model |
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