不同锚栓布置下钢板加固的盾构隧道管片纵缝接头试验研究
王金龙1甘海杰2孙雪兵1娄英豪1柳献2
Longitudinal Joint Experiment of Shield Tunnel Segments Reinforced with Steel Plates under Different Anchor Bolt Arrangements
WANG Jinlong1GAN Haijie2SUN Xuebing1LOU Yinghao1 LIU 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.20230551
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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］针对目前常用的盾构管片钢板加固法存在的界面黏结薄弱、传力不明确等问题，有必要开展不同锚栓布置下钢板加固的盾构隧道管片纵缝接头（以下简称“接头”）的足尺试验，同时对现有锚栓布置方式优化设计。［方法］从试件设计、加固方法、加载设备及测试与加载方案等方面，详细介绍了钢板加固的盾构隧道管片纵缝接头试验。针对正弯矩和负弯矩等不同受力状态下的纵缝，采用不同锚栓布置方式，开展接头极限承载力试验研究。对比分析加固结构的受力性能和破坏模式，揭示其破坏机理，并评估不同锚栓布置下的加固效果。［结果及结论］对承受正弯矩作用的钢板加固的盾构隧道管片，增加纵缝两侧的锚栓布置，能够提升接头的承载能力，增幅为8%；对承受负弯矩作用的钢板加固的盾构隧道管片，减少纵缝两侧的锚栓布置，接头的承载能力未降低；针对不同锚栓布置下钢板加固的盾构隧道管片接头，黏结强度是加固结构的关键性能指标。
Abstracts:
［Objective］ To address the issues of weak interfacial bonding and unclear force transmission commonly associated with current steel plate reinforcement methods for shield tunnel segments, it is necessary to conduct full-scale experiments on the longitudinal joints (hereinafter referred to as ′joints′) of shield tunnel segments reinforced with steel plates under various anchor bolt arrangements, and to optimize existing anchor bolt configurations. ［Method］ A detailed description of the experimental investigation on steel plate-reinforced longitudinal joints of shield tunnel segments is delivered, covering specimen design, reinforcement methods, loading equipment, and testing/loading schemes. Ultimate bearing capacity tests are conducted on longitudinal joints subjected to different stress conditions, including positive and negative bending moments, using different anchor bolt arrangements. The mechanical performance and failure modes of the reinforced structures are comparatively analyzed to reveal their failure mechanism and evaluate the reinforcement effectiveness under different anchor bolt arrangements. ［Result & Conclusion］ For steel plate-reinforced shield tunnel segments subjected to positive bending moment, increasing the number of anchor bolts on both sides of the longitudinal joint could improve the joint bearing capacity by 8%. For steel plate-reinforced shield tunnel segments subjected to negative bending moments, the joint bearing capacity remains the same when reducing the number of anchor bolts on both sides of the longitudinal joint. Targeting the steel plate-reinforced shield tunnel segment joints under various anchor bolt arrangements, the bond strength is identified as the key performance indicator of the reinforcement structure.
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