摘要
既有地铁结构可能因邻近基坑工程施工而产生变形,在一定程度上会对地铁线路的正常运营产生影响。该文以天津市某邻近深基坑工程的既有地铁线路为例,采用PLAXIS 3D有限元数值模拟分析法建立三维空间实体模型,对邻近地铁结构的基坑Ⅰ、Ⅱ施工过程进行模拟,分析计算地铁车站主体结构、隧道管片的位移,以此来研究基坑施工对邻近既有地铁结构变形的影响。研究结果表明,基坑大面积开挖产生的卸荷效应显著,从而导致地铁结构产生一定的水平位移和沉降。距离地铁结构最近的基坑Ⅰ三期对地铁结构水平位移的影响最为明显。提出在其之间预设注浆纠偏措施的同时应加强变形监测,以保证隧道安全。计算所得各项变形指标均在变形控制标准之内。
Due to the construction of the adjacent foundation pit engineering,the existing metro structure may produce deformation. To a certain extent,it have a certain impact on the normal operation of the metro lines. This paper takes the existing metro line which is adjacent to the deep foundation pit engineeting in Tianjin City as an example. The PLAXIS 3 D finite element numerical simulation analysis method is used to establish a 3 D spatial entity model to simulate the construction process of foundation pit I and II which are adjacent to the metro structure. The displacement of the main structure of the metro station and the tunnel section is analysed and calculated,and the influence to the deformation of adjacent existing metro structure by the foundation pit construction is studied. The results of the study show that the unloading effect by large area excavation of foundation pit is remarkable,and it leads to a certain horizontal displacement and settlement to the metro structure. The third phase of the foundation pit I which is nearest to the metro structure has the most obvious influence on the horizontal displacement of the metro structure. The correction measures of presupposition grouting between them are proposed,and at the same time,the deformation monitoring should be strengthened to ensure the safety of the tunnel. All the calculated deformation indexes are all within the control standard of deformation.
作者
陈涛
翟超
范鹏程
李更召
黄亚德
Chen Tao;Zhai Chao;Fan Pengcheng;Li Gengzhao;Huang Yade(Tianjin Institute of Geotechnical Investigation and Surveyin)
出处
《勘察科学技术》
2018年第3期1-6,31,共7页
Site Investigation Science and Technology
关键词
既有地铁结构
基坑开挖
变形
PLAXIS
3D
数值分析
existing metro structure
foundation pit excavation
deformation
PLAXIS 3D
numerical analysis
作者简介
陈涛（1985-），男，工程师，硕士，主要从事运营地铁结构变形监测方面的工作。
