海底风化槽地铁盾构隧道结构受力监测与计算
张强1,2王九利3
Structural Force Monitoring and Calculation of the Metro Shield Tunnel in Subsea Weathered Slot
ZHANG Qiang1,2WANG Jiuli3
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作者信息:1.北京安捷工程咨询有限公司，100037，北京
2.城市轨道交通绿色与安全建造技术国家工程实验室，100037，北京
3.青岛地铁集团有限公司，266100，青岛
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Affiliation:1.Beijing AGILETECH Engineering Consultants Co .,Ltd., 100037, Beijing, China
2.National Engineering Lab for Green & Safe Construction Technology in Urban Rail Transit, 100037,Beijing, China
3.Qingdao Metro Group Co., Ltd., 266100,Qingdao, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.10.021
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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］为探明海底风化槽盾构隧道结构荷载分布特征，特开展隧道管片结构内力响应规律研究。［方法］依托某跨海地铁盾构隧道项目，针对其海底风化槽段，实施了管片水土荷载及结构内力的系统性监测。通过数据分析，揭示了该区域隧道结构荷载与内力的分布特征，并进一步验算了潮汐荷载作用下管片的疲劳特性。［结果及结论］①监测结果显示，水土压力与钢筋内力经历了初期的显著波动后趋于稳定。稳定阶段的水土压力维持在0.1~0.4MPa范围内。内侧钢筋应力范围为-2.19~-38.60MPa，外侧的则为-6.95~-34.59MPa。对比钢筋应力的计算值与实测值，二者比值为0.6~1.8，显示出良好的一致性。②管片所受水土荷载随潮汐水位的周期性变化(周期为12h)而呈现相应的波动。管片接缝处的最大主应力水平为-2.45~-2.60MPa，应力幅值在0.31~0.34MPa之间，应力比则介于0.87~0.96之间。③在不同潮汐荷载幅值条件下，管片的应力水平保持相对稳定，而应力幅值则随潮汐荷载幅值的增加而线性增长，同时应力比呈线性下降趋势。当潮汐荷载幅值达到实测值的5倍时，管片的主应力幅值增大至1.70MPa，应力比降至0.84，此时混凝土主应力的最大值范围为-1.6~-3.6MPa。
Abstracts:
［Objective］ In order to explore the load distribution characteristics of shield tunnel structures in subsea weathered slot, a study on the internal force response law of the segment structures is carried out. ［Method］ Relying on a cross-sea metro shield tunnel project, systematic monitoring of water-soil loads and structural internal forces of the segments is carried out for the subsea weathered slot section. Through data analysis, the distribution characteristics of the tunnel structural loads and internal forces in this area are revealed. The fatigue characteristics of the segments under tidal load are further verified. ［Result & Conclusion］ ① The monitoring results show that the soil and water pressures and the internal forces of the reinforcement tend to stabilize after significant fluctuations in the initial stage. In the stable stage, water-soil pressure is maintained within the range of 0.1~0.4 MPa, the stress range of the inside reinforcement is -2.19~-38.60 MPa, and that of the outside reinforcement is -6.95~-34.59 MPa. The ratio between the calculated and measured values of the reinforcement stress is 0.6~1.8, which shows a good consistency. ② The water-soil loads on the segments show corresponding fluctuations with the periodic changes of the tidal water level (period of 12 h). The maximum main stress level at the segment joint is -2.45~-2.60 MPa, the stress amplitude is between 0.31~0.34 MPa, and the stress ratio is between 0.87~0.96. ③ Under different tidal load amplitude conditions, the segment stress level remains relatively stable, while the stress amplitude increases linearly with the increase of tidal load amplitude, and the stress ratio shows a linear downward trend. When the tidal load amplitude reaches 5 times of the actual measured value, the main stress amplitude of the segment increases to 1.70 MPa, and the stress ratio decreases to 0.84, at this time the maximum value of the concrete main stress ranges from -1.6 to -3.6 MPa.
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