既有地铁车站结构安全性评估方法研究.docx

文章编号：1000－7598 (2011) 04－1193－07既有地铁车站结构安全性评估方法研究李奎，李志业，高波（西南交通大学 地下工程系，成都 610031）摘 要：运用有限元程序及有限差分程序研究了新建地下风险工程对既有地铁车站结构的影响。结合既有车站双层风道与西南出入口结构之间的新建 3 号联络通道施工引起的位移分析，阐述了不同数值方法用于近接工程施工安全性评估的特点，并 检算既有结构的承载力，结合既有结构现状调查结果，给出评估结论及推荐施工控制指标：地表沉降不超过 7 mm，地表隆 起不超过 8 mm；车站底板隆起位移控制在 7 mm 以内，沉降缝两侧结构隆起位移差控制在 2 mm 以内；轨道的隆起位移不超 过 5.8 mm，轨道水平不超过±0.6 mm。在上述位移控制指标范围内，得出新建隧道施工后既有地铁结构是安全的。关 键 词：浅埋隧道；既有地铁车站结构；数值方法；安全性评估中图分类号：TU 451文献标识码：AStudy of safety evaluation method for existing metro station structuresLI Kui，LI Zhi-ye，GAO Bo（Department of Tunnel and Underground Engineering, Southwest Jiaotong University, Chengdu 610031, China）Abstract: The effect on existing metro station structures caused by the construction of new risk underground project is studied by thefinite element program and the finite difference program. The analysis of displacement caused by the construction of new contact channel No.3 between double-floor windtunnel and southwest entrance structure is expounded on the characteristics of safety evaluation of approaching project construction using different numerical methods. The evaluation conclusions are produced by checking the carrying capacity of existing structures combined with the survey of existing structures status. The displacement control indices are proposed that the settlement and uplift of the ground surface should not exceed 7 mm 8 mm, respectively; the uplift displacement of the station soleplate and the relative uplift displacement of structures on both sides of settlement joint should be controlled in 7 mm 2 mm, respectively; the uplift displacements of the tracks and track cross level should not exceed 5.8 mm ±0.6 mm, respectively. The existing metro structures will be safe after the new-built tunnel is constructed if displacement controls are in the above-mentioned ranges.Key words: shallow tunnel; existing metro station structures; numerical method; safety evaluation为北京地下轨道交通建设管理的一个重要组成部分。风险管理按照工程进度可划分为 5 个阶段，即 规划阶段、工可阶段、设计阶段、招投标阶段和施 工阶段。对于设计阶段而