摘要
文章以某既有地铁隧道结构周边新建的城市高架桥大直径桩基施工工程为研究案例,采用三维有限元模拟方法,计算大直径群桩基础施工对既有隧道结构内力及变形的影响,分析施工各阶段影响趋势变化。结果显示,桩基施工对既有隧道区间结构影响显著,该阶段桩基钻孔开挖对土体有应力释放作用,应采用护筒跟进并穿越隧道结构所在土层,以保证桩基施工中孔壁稳定,避免区间结构出现不可控变形。
Taking the construction project of the large-diameter pile foundation for a newly-built urban viaduct around the existing subway tunnel structure as the research case,the impact of the large-diameter pile group foundation construction on the internal force and deformation of the existing tunnel structure is calculated by using the three-dimensional finite element simulation method,and the trend changes of the impact of each construction stage are analyzed.The results show that,the pile foundation construction has a significant impact on the existing tunnel section structure.During this stage,the pile foundation drilling and excavation have a stress release effect on the soil mass.The pile casing should be used to follow up and cross the soil layer where the tunnel structure is located to ensure the stability of the hole wall during the pile foundation construction and avoid uncontrollable deformation of the section structure.
作者
杜亚光
曾向往
向毓
Du Yaguang;Zeng Xiangwang;Xiang Yu(Wuhan Municipal Engineering Design and Research Institute Co.,Ltd.,Wuhan 430015,China;Hubei Urban Construction Design Institute Co.,Ltd.,Wuhan 430051,China)
出处
《北方交通》
2024年第3期79-82,共4页
Northern Communications
关键词
大直径
桩基础
既有隧道
施工影响分析
Large diameter
Pile foundation
Existing tunnel
Construction impact analysis
