盾构隧道近接下穿端承群桩基础管片受力性能研究  

Research on Segments Mechanical Performance of Shield Tunnels Beneath Pass the End Bearing Pile Group Foundation

作　　者：刘颂玉 LIU Songyu(China Railway 14th Bureau Group Co.,Ltd.,Jinan,Shandong250101,China)

机构地区：[1]中铁十四局集团有限公司,山东济南250101

出　　处：《施工技术（中英文）》2024年第3期49-53,共5页Construction Technology

基　　金：国家重点研发计划(2023YFC3806703);中铁十四局集团科技研发计划课题(913700001630559891202105)。

摘　　要：针对盾构隧道小净距近接下穿端承群桩基础施工的情况,运用有限元方法对比分析了有桩、无桩及不同桩底至隧道顶部竖向净距条件下管片结构受力及变形特征。研究结果表明,隧道小净距近接下穿端承群桩基础时引起的管片结构受力和变形较大,且在边桩处更易突变;桩底至隧道顶部竖向净距越小,管片结构受力和变形越大,管片内侧弯矩增加更为显著;通过Mindlin应力公式求出拱顶附加应力值,再附加于管片结构的整体受力计算中,可作为盾构隧道小净距近接下穿端承群桩基础施工的安全储备。In view of the situation that the shield tunnel beneath pass the end bearing pile group foundation,the finite element method is used to compare and analyze the stress and deformation characteristics of the segment structure under the condition of pile,no pile and different vertical clear distance from pile bottom to tunnel top.The results show that the stress and deformation of the segment structure are large when the tunnel beneath pass the end bearing pile group foundation,and it is more likely to mutate at the side pile.The smaller the vertical clear distance from the bottom of the pile to the top of the tunnel,the greater the stress and deformation of the segment structure,and the more significant the increase of the inner bending moment value.Through the Mindlin stress formula,the additional stress value of the vault is obtained,which is added to the overall stress calculation of the segment structure,it can be used as a safety reserve for the construction of the shield tunnel beneath pass the end bearing pile group foundation.

关 键 词：隧道 盾构 端承桩 管片 受力性能 

分 类 号：U455[建筑科学—桥梁与隧道工程]