大直径海底盾构隧道施工过程中衬砌管片受力分析
麻凤海1郑叶琳1王洪亮2
Stress Analysis of Large-diameter Undersea Shield Tunnel Lining Segments during Construction Process
MA Fenghai1ZHENG Yelin1WANG Hongliang2
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作者信息:1.大连大学建筑工程学院，116622，大连
2.北京安捷工程咨询有限公司，116021，大连
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Affiliation:1.School of Civil Engineering and Architecture, Dalian University, 116622, Dalian, China
2.Beijing Anjie Engineering Consulting Co., Ltd., 116021, Dalian, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.08.028
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中图分类号/CLCN:U456.3+1
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栏目/Col:研究报告
摘要:
［目的］为判定海底大直径盾构隧道结构工程的安全性和可靠性，需对其衬砌管片的受力进行分析。［方法］以大连地铁5号线大连站站—梭鱼湾南站区间海底盾构隧道衬砌管片为研究对象，利用MIDASGTS有限元分析软件对该盾构隧道结构和周围岩体进行建模，得出施工一段时间后衬砌管片的受力情况，并与现场监测数据、理论计算数据进行对比分析。［结果及结论］衬砌管片所受土压力随施工推进基本稳定；同一监测断面不同测试点土压力存在一定差异，拱顶和拱底位置处受力较大，因此在隧道施工期以及未来运营期，拱顶和拱底均为着重关注部位，可通过一定物理手段对其加强处理；现场监测数据和数值模拟数据显示，衬砌管片内力结果较为接近，在一定简化条件下，数值模型能够较为真实地反映衬砌管片的实际受力情况。
Abstracts:
［Objective］ To assess the engineering safety and reliability of undersea large-diameter shield tunnel structures, it is essential to analyze the stress on lining segments. ［Method］ Taking the lining segments of Dalian Railway Station-Suoyuwan South Station Interval undersea shield tunnel on Dalian Metro Line 5 as research object, MIDAS GTS finite element analysis software is used to model the shield tunnel structure and the surrounding rock mass. The stress on lining segments after a period of construction is obtained and comparatively analyzed with field monitoring and theoretical calculation data. ［Result & Conclusion］ The earth pressure on lining segments remains relatively stable as construction progresses. There are certain differences in earth pressure at different points on the same monitoring section, with the arch vault and bottom experiencing higher stress. Therefore, during both the construction and future operation periods of the tunnel, the arch vault and bottom should be areas of key focus and be reinforced through physical measures. The onsite monitoring and numerical simulation data indicate that the internal forces on lining segments are quite similar. Under certain simplified conditions, the numerical model can quite realistically reflect the actual stress conditions of lining segments.
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