运营期地铁隧道洞门渗漏病害原因分析及治理
宋伟1牛晓凯1宋立鸿1谢治天1,2许晨涛1
Cause Analysis and Treatment of Metro Tunnel Portal Water Leakage in Operational Period
SONG Wei1NIU Xiaokai1SONG Lihong1XIE Zhitian1,2XU Chentao1
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作者信息:1.北京市市政工程研究院， 100037， 北京；
2.北京工业大学材料与制造学部， 100124， 北京
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Affiliation:1.Beijing Municipal Engineering Research Institute, 100037, Beijing, China;
2.Faculty of Materials and Manufacturing, Beijing University of Technology, 100124, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20231326
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中图分类号/CLCN:U457+.2
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栏目/Col:土建工程
摘要:
［目的］为解决运营期地铁隧道洞门部位渗漏病害频发问题，降低维护成本和地铁运营风险，需对洞门渗漏的关键诱发因素及治理技术进行深入研究。［方法］依托北京地铁首都机场线某区间盾构隧道洞门渗漏治理示范工程，全面检测了洞门部位渗漏及其他病害，分析了洞门反复渗漏的机理，采用数值模拟进一步研究了衬砌背后空洞对洞门反复渗漏的影响特征。［结果及结论］隧道洞门部位渗漏病害通常同结构变形、裂损等多种病害同时存在，衬砌背后空洞是诱发次生病害的核心因素，结构变形随空洞面积的增大而增大，表明结构内部的防水措施局部失效。内含“双液复合注浆”结构背后空洞填充工艺的立体复合式治理技术可在衬砌背后空洞中形成有效的填充体，保持结构整体稳定，建立立体的防水体系，有效解决运营期盾构隧道洞门反复渗漏的难题。
Abstracts:
［Objective］ To address the frequent occurrence of water leakage at tunnel portals in operational metro tunnels, reduce maintenance costs and mitigate operational risks, it is necessary to conduct in-depth research on the key inducing factors and treatment technologies for tunnel portal water leakages.［Method］ Based on the demonstration project for shield tunnel portal leakage control in a section on Beijing Subway Capital Airport Express, a comprehensive inspection is conducted on tunnel portal water leakage and other related diseases. The mechanism of recurrent leakage is analyzed, and numerical simulations are employed to further investigate the impact characteristics of cavities behind the lining on repeated water leakage at portals.［Result & Conclusion］ Water leakage at tunnel portals is commonly accompanied by multiple defects such as structural deformation and cracking. The cavity behind the lining is identified as the core factor inducing secondary defects. Structural deformation increases with the expansion of the cavity area, indicating localized failure of internal waterproofing measures. The three-dimensional composite treatment technology-featuring a dual-liquid composite grouting process for cavity filling behind the structure-can effectively form a filling in the voids behind the lining, preserve structural overall stability, establish a 3D waterproof system, thereby effectively resolving the challenges of recurrent water leakage at tunnel portals in operational shield tunnels.
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