摘要
[目的]道路桩板结构施工会对邻近地铁隧道、铁路结构产生较大影响,在严格的规范要求和复杂的工程状况下,需要保证既有地铁、铁路结构的安全。[方法]基于新建百安公路工程,利用数值模拟方法,构建Plaxis 3D有限元计算模型,模拟各施工工况,分析桩板结构施工过程对邻近的既有地铁、高铁的影响。[结果及结论]研究结果表明:在该公路工程钻孔灌注桩施工过程中易出现塌孔、土塞效应等不良情况,将会对邻近地铁线路造成不利影响,使地铁隧道位移及收敛变形超过控制值;而施工过程对高铁桥梁影响较小,变形在可控范围之内。为此,需改进和优化公路的施工方案,如增加桩基础与地铁隧道的距离、增加部分桩长等,并对优化设计方案进行了安全评估。然后再进行的数值模拟结果显示,公路施工引起的地铁隧道位移和变形可以满足要求,能保证地铁隧道的结构安全。
[Objective]The construction of road pile-plate structures can significantly impact adjacent metro tunnels and railway structures.Under stringent regulatory requirements and complex engineering conditions,it is essential to ensure the safety of existing metro and railway structures.[Method]Based on the new Bai′an Highway project,numerical simulation methods are utilized to construct a Plaxis3D finite element calculation model.This model simulates various construction conditions to analyze the impact of pile-plate structure construction process on the adjacent existing metro and high-speed railway.[Result&Conclusion]The research results indicate that during the construction of bored cast-in-place piles in this road project,adverse conditions such as hole collapse and soil plug effect are likely to occur.These conditions can negatively impact adjacent metro lines,causing metro tunnel displacement and convergence deformation to exceed control values.In contrast,the construction process has less impact on high-speed railway bridges,with deformation remaining within controllable limits.Therefore,it is necessary to improve and optimize the road construction plan,such as increasing the distance between pile foundation and metro tunnels and extending the length of some piles.A safety assessment of the optimized design scheme is conducted,and subsequent numerical simulation results show that the metro tunnel displacement and deformation caused by road construction can meet the required standards,ensuring metro tunnel structural safety.
作者
刘江涛
龚铭杰
元翔
林子涵
LIU Jiangtao;GONG Mingjie;YUAN Xiang;LIN Zihan(Shanghai Jiading Highway Construction Development Co.,Ltd.,201899,Shanghai,China;Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,201804,Shanghai,China)
出处
《城市轨道交通研究》
北大核心
2024年第10期59-64,共6页
Urban Mass Transit
基金
国家自然科学基金项目(51708424)。
关键词
新建公路
桩板结构施工
地铁隧道
高铁桥梁
数值模拟
影响分析
new highway
pile-plate structure construction
metro tunnel
high-speed railway bridge
numerical simulation
influence analysis
