摘要
[目的]盾构隧道是柔性结构,具有多缝特征。受施工初始质量缺陷、周围载荷变异、外部环境恶化以及管养不到位等因素影响,易出现结构变形超限、渗漏超标以及耐久性劣化等问题,仅依靠运营期加固和整治无法彻底解决。且随着线网规模的扩大,维修成本和夜间天窗时间资源的代价也会急剧增加,最终影响城市轨道交通全网的运维效率和质量。因此需研究提升盾构隧道结构本质安全的技术措施。[方法]分析了上海轨道交通盾构隧道的主要病害及影响盾构隧道结构安全的主要因素;介绍了上海轨道交通提升盾构隧道结构本质安全的技术措施以及确保盾构隧道结构本质安全的创新实践。[结果及结论]上海轨道交通采取的提升盾构隧道结构本质安全的技术措施包括优化扩大盾构隧道内径、采用错缝拼装方式、提升接缝密封防水设计,确保盾构隧道结构本质安全的创新实践包括采用预埋承插式管片新型盾构隧道结构、采用推拼同步智能盾构装备及隧道智能建造技术。从源头把握盾构隧道结构本质安全,通过优化隧道结构设计、创新拼装技术以及采用智能化装备,在建设阶段提升盾构隧道的成型质量、减少结构初始缺陷,能够降低运营期盾构隧道结构发生病害的可能性,可为隧道的长期运营安全奠定坚实基础。
[Objective]Shield tunnels are inherently flexible structures characterized by multiple joints.Due to factors such as initial structural defects,varying surrounding loads,environmental deterioration and inadequate maintenance,shield tunnels are susceptible to deformation exceeding allowable limits,excessive leakage and durability degradation.Solely relying on reinforcement and rectification during operational phase cannot comprehensively address these issues.Moreover,with the expansion of rail network,maintenance costs and the expense of night operation window time resources are also increasing drastically,ultimately affecting the operation-maintenance efficiency and quality of the entire urban rail transit network.Therefore,it is necessary to research technical measures for enhancing the inherent safety of shield tunnel structures(hereinafter abbreviated as′shield inherent safety′).[Method]The primary defects in Shanghai rail transit shield tunnels and the main factors affecting the shield tunnel structure safety are analyzed.The technical measures for enhancement and the innovative practices for guarantee of shield inherent safety adopted by Shanghai rail transit are introduced.[Result&Conclusion]The technical measures implemented by Shanghai rail transit to enhance shield inherent safety include optimizing and expanding the internal diameter of shield tunnels,adopting a staggered joint assembly method,and improving joint sealing and waterproof design.The innovative practices ensuring the shield inherent safety involve the use of a novel shield tunnel structure with pre-embedded socketed segments,the utilization of push-and-assemble synchronized intelligent shield tunneling equipment,and tunnel smart construction technology.By addressing the shield inherent safety at the source and optimizing tunnel structure design,innovating assembly techniques,and employing intelligent equipment,Shanghai rail transit aims to improve the forming quality of shield tunnels during the construction phase and reduce initial str
作者
毕湘利
BI Xiangli(Shanghai Shentong Metro Group Co.,Ltd.,201103,Shanghai,China)
出处
《城市轨道交通研究》
北大核心
2024年第1期1-5,共5页
Urban Mass Transit
关键词
上海轨道交通
盾构隧道
错缝拼装
智能装备
Shanghai Rail Transit
shield tunnel
staggered joint assembly
intelligent equipment
