复合腔体加固的盾构隧道管片纵缝接头试验研究
孙雪兵1甘海杰2王金龙1吕延豪1娄英豪1柳献2
Experimental Study on Segment Longitudinal Joints of Shield Tunnel Reinforced with Filament Wound Profile
SUN Xuebing1GAN Haijie2WANG Jinlong1LYU Yanhao1LOU Yinghao1LIU Xian2
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作者信息:1.中铁第四勘察设计院集团有限公司， 430063， 武汉
2.同济大学土木工程学院， 200092， 上海
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Affiliation:1.China Railway Siyuan Survey and Design Group Co., Ltd., 430063, Wuhan, China
2.College of Civil Engineering, Tongji University, 200092, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20230492
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中图分类号/CLCN:U455.43
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栏目/Col:土建工程
摘要:
［目的］盾构隧道使用年限的增加使得加固维修需求不断上升。复合腔体作为新型加固材料，其应用逐渐增多，因此研究其材料性能及不同接缝受力条件下的加固效果具有重要意义。［方法］以复合腔体加固的盾构管片纵缝接头为研究对象，开展了材料性能试验和接头受力分析。通过试验，研究了不同接缝受力条件下加固盾构管片纵缝接头的受力性能、破坏形态及破坏机理，并对加固效果进行了评定。［结果及结论］试验结果显示：复合腔体抗压极限承载力和抗弯极限承载力分别为689.67 kN和8.25 kNm，弹性阶段抗弯刚度为1.93×10^9 Nmm^2。复合腔体加固能够有效提高管片纵缝接头的承载能力和刚度，加固后正弯矩作用下接头的极限承载弯矩为289.29 kNm，负弯矩作用下接头的极限承载弯矩为134.95 kNm。复合腔体加固混凝土管片的界面强度是加固结构的关键性能指标，界面破坏后会降低结构的整体刚度。
Abstracts:
［Objective］ With the increasing service life of shield tunnels, demands for reinforcement and maintenance continue to grow. As a new reinforcement material, FWP (filament wound profile) is being increasingly applied, making it significant to study their material properties and reinforcement effectiveness under different joint stress conditions. ［Method］ Focusing on the segment longitudinal joints of shield tunnel reinforced with FWP, material property tests and joint stress analyses are conducted. The stress performance, failure modes, and failure mechanisms of the reinforced segment longitudinal joints under various stress conditions are investigated through experiments, and the reinforcement effectiveness is evaluated. ［Result & Conclusion］ The experimental results indicate that the FWP exhibits a compressive ultimate bearing capacity of 689.67 kN, a flexural ultimate bearing capacity of 8.25 kN·m, and an elastic-phase flexural stiffness of 1.93×109 N·mm2. The FWP reinforcement can effectively enhance the bearing capacity and stiffness of the segment longitudinal joints. After reinforcement, the ultimate flexural bearing capacity of the joints reaches 289.29 kN·m under positive bending moment, and 134.95 kN·m under negative bending moment. The interface strength of concrete segment reinforced with FWP is a key indicator of reinforced structure performance. The interface damage and failures could reduce the overall stiffness of the structure.
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