文中以某地铁工程为例,对不同施工步骤下地铁基坑自身结构变形、周边地表沉降量以及周边构筑物的变形进行分析.结果表明,围护结构水平位移随着围护结构埋深的增加表现为先增加后降低的规律,最大的围护结构水平位移为 37.5 m;随着施工的持续,周边地表沉降量随着距基坑边缘水平距离的增加呈现先增加后不断降低,最大地表沉降量为20 mm.初始开挖阶段既有工程墙体的变形不受基坑开挖的影响,当施工至土体回填时,既有建筑墙体的最大法向变形为25 mm,,既有商业街墙体的最大法向变形为16 mm.
Analysis of Deformation Influence of Subway Foundation Pit Construction on Surrounding Structures
Taking a subway project as an example,the paper analyzes the deformation of the subway foundation pit itself,the surrounding sur-face settlement and the deformation of the surrounding structures under different construction steps.The results show that the horizontal dis-placement of the enclosure structure increases first and then decreases with the increase of the buried depth of the enclosure structure,and the maximum horizontal displacement of the enclosure structure is 37.5 m.With the continuous construction,the surrounding surface settlement increases first and then decreases with the increase of the horizontal distance from the edge of the foundation pit,and the maximum surface set-tlement is 20 mm.The deformation of existing engineering wall is not affected by foundation pit excavation at the initial excavation stage.When the soil is backfilled,the maximum normal deformation of the existing building wall is 25 mm.The maximum normal deformation of the existing commercial street wall is 16 mm.
国家科技期刊平台
NSTL
万方数据
