运营盾构隧道洞内注浆修复试验研究
万勇1王金龙2唐飞1孙雪兵2张雨蒙3蔡兴瑞2柳献3
Experimental Investigation on Grouting Repair in Operational Shield Tunnels
WAN Yong1WANG Jinlong2TANG Fei1SUN Xuebing2ZHANG Yumeng3CAI Xingrui2LIU Xian3
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作者信息:1.武汉地铁桥隧管理有限公司，430077，武汉
2.中铁第四勘察设计院集团有限公司，430063，武汉
3.同济大学土木工程学院地下建筑与工程系，200092，上海
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Affiliation:1.Wuhan Metro Bridge and Tunnel Management Co., Ltd., 430077, Wuhan, China
2.China Railway Fourth Survey and Design Institute Group Co., Ltd., 430063, Wuhan, China
3.Department of Geotechnical Engineering 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.2024.07.016
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中图分类号/CLCN:U457+.2
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栏目/Col:研究报告
摘要:
［目的］盾构隧道结构发生横截面大变形后，若采用内张钢圈等方法进行加固，会花费大量材料和人工成本。通过二次注浆改善盾构隧道结构受力条件、主动回调变形是更加经济的手段。因此有必要对注浆修复盾构隧道结构横截面变形的有效性、注浆过程中及注浆后的结构响应进行深入研究。［方法］依托武汉地铁盾构隧道进行现场洞内注浆试验，测量、比较了注浆前后隧道的周边地层缺陷、结构裂缝及收敛变形。详细分析了洞内侧向注浆后隧道结构收敛变形、水平平移的时变规律。［结果及结论］试验结果证明了洞内侧向注浆对修复地层缺陷、治理隧道结构裂缝和横截面大变形的有效性；揭示了注浆荷载影响下衬砌环的收敛变形、水平平移的分布规律和时变发展过程。在注浆过程中，注浆点位所在的衬砌环呈现“竖鸭蛋”收敛变形趋势；注浆后2.5h，受浆液收缩影响，衬砌结构“竖鸭蛋”收敛变形有所回弹，“横鸭蛋”收敛变形趋势进一步发展；注浆后20.0h左右，隧道结构收敛变形基本稳定。
Abstracts:
［Objective］ After a significant cross-sectional deformation of shield tunnel structure, using internal tension steel ring reinforcement and the like will incur substantial material and labor costs. Improving the stress conditions of the shield tunnel structure and proactively correcting deformations through secondary grouting is a more economical approach. Therefore, it is necessary to conduct an in-depth study on the effectiveness of grouting repairing cross-sectional deformation in shield tunnel structure, as well as the structural response during and after grouting process. ［Method］ Field grouting tests are conducted in a shield tunnel of Wuhan Metro, peripheral strata defects, structural cracks, and convergence deformations before and after grouting are measured and compared. The law of tunnel structure convergence deformation and horizontal displacement changing over time after lateral grouting inside tunnel structure is analyzed in-depth. ［Result & Conclusion］ The test results demonstrate that the effectiveness of lateral grouting inside the tunnel in repairing ground defects, addressing tunnel structural cracks, and correcting significant cross-sectional deformations. The distribution pattern and time-history development of convergence deformations and horizontal translations of the lining ring under grouting load influence are revealed. During grouting process, the lining ring at the grouting point exhibit a ′vertical-ellipse′ deformation convergence trend. Approximately 2.5 hours after grouting, the lining structure exhibits some rebound in ′vertical-ellipse′ convergence deformation due to the grout shrinkage, and the deformation trend further continues. Around 20.0 hours post-grouting, the tunnel structure convergence deformation will be basically stabilized.
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