摘要
随着城市建设步伐的加快,越来越多的建(构)筑物施工会对已建成的地铁结构造成影响,为了研究新建明挖基坑及群桩基础对邻近既有地铁区间的影响,依托长沙市黎托生态公园基坑项目,利用有限元计算软件建立基坑与相邻地铁2、4号线的三维数值模型,模拟公园基坑开挖及桩基施作至公园运营阶段桩基承载的全过程,得到公园基坑及群桩基础施工对既有地铁区间隧道的影响。此外,针对施工过程中可能出现因地层变化引起的桩长调整,对不同长度桩基础对地铁区间隧道的影响进行趋势分析。研究结果表明,基坑及桩基础施工过程对地铁区间的影响可控,当桩底超过区间结构顶部时,桩长改变对地铁区间的影响变化不大。
As the pace of urban construction accelerates,more and more new constructions will affect existing subway structures. In order to study the influence of new foundation pit and pile group foundation on adjacent existing subway tunnel,based on the foundation pit project of Lituo ecological park in Changsha,a three-dimensional numerical model of the subway line 2 and line 4 is built by using finite element software. The influence is analyzed by simulating whole process of the excavation of foundation pit and construction of pile group foundation. In addition,in view of possible pile length adjustments due to changes of stratum during the construction,the influence of different lengths of pile foundations on subway tunnels is carried out. The results show that the influences of the construction process of foundation pit and pile group foundation on the subway tunnel is under control. When the pile bottom exceeds the top of the tunnel,the change of pile length has little influence on the subway tunnel.
作者
康佩
Kang Pei(Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China)
出处
《铁道勘察》
2020年第5期57-61,共5页
Railway Investigation and Surveying
关键词
基坑开挖
群桩基础
地铁盾构区间
位移
影响
Foundation pit excavation
Pile group foundation
Subway shield tunnel
Displacement
Influence
作者简介
康佩(1987-),女,2012年毕业于北京交通大学桥梁与隧道工程专业,工学硕士,工程师。
