大直径盾构隧道下穿铁路加固优化分析  

OPTIMIZATION ANALYSIS OF REINFORCEMENT FOR LARGE-DIAMETER METRO SHIELD TUNNEL UNDERCROSSING THE EXISTING RAILWAY

作　　者：张委定 龚云强 ZHANG Weiding;GONG Yunqiang(Tianjin Municipal Engineering Design and Research Institute Co.,Ltd.,Tianjin 300051,China;North China Municipal Engineering Design and Research Institute Co.,Ltd.,Tianjin 300074,China)

机构地区：[1]天津市政工程设计研究总院有限公司,天津300051 [2]中国市政工程华北设计研究总院有限公司,天津300074

出　　处：《低温建筑技术》2024年第8期111-115,共5页Low Temperature Architecture Technology

摘　　要：大直径盾构隧道施工时对周边土体扰动十分明显。文中依托某地铁区工程,建立了包含盾构隧道、铁路结构的三维数值模型,对比分析了不同加固方案、加固参数、加固长度及加固范围下铁路轨道位移变化规律。研究表明不加固和单线加固方案下轨道位移不满足要求,双线加固方案满足要求;轨道位移与加固体弹性模量近似成指数关系,但超过一定值后,位移改善程度减小;轨道纵向水平位移、竖向位移与加固长度近似成指数关系;相对于顶部局部加固,3/4断面加固后轨道竖向位移减小幅度超过55%,位移满足控制标准。研究结论可为类似盾构隧道下穿既有铁路变形控制提供借鉴与参考。The construction of large-diameter shield tunnel has a disturbing effect on the adjacent soil.Based on a metro section project,a three-dimensional numerical model including shield tunnel and railway structure is estab⁃lished.The displacement changing characteristic of railway tracks under different reinforcement schemes,reinforce⁃ment parameters,reinforcement lengths,and reinforcement ranges are studied.The results show that the track dis⁃placement does not meet the requirements under the non-reinforcement and single line reinforcement schemes,while the double line reinforcement scheme meets the requirements.The displacement of the track is approximately exponentially related to the elastic modulus of the added solid,but after exceeding a certain value,the degree of dis⁃placement improvement decreases.The longitudinal horizontal displacement,vertical displacement,and reinforce⁃ment length of the track are approximately exponentially related.Compared to the local reinforcement at the top,the vertical displacement of the track decreased by more than 55%after the reinforcement of the 3/4 section,and the dis⁃placement met the control standards.

关 键 词：高能级强夯 回填场地 加固效果 原位测试 土工试验 

分 类 号：TU921[建筑科学—建筑设计及理论]