逆作基坑地下连续墙水平变形数值分析

NUMERICAL SIMULATION ANALYSIS OF THE UNDERGROUND DIAPHRAGM WALL ON TOP-DOWN FOUNDATION PIT

以天津某深基坑工程为例,利用ABAQUS有限元软件对基坑开挖过程进行三维数值模拟,分析基坑开挖过程中不同开挖顺序和开挖工况下基坑不同位置处地连墙水平变形情况。通过分析对比,认识到不同开挖顺序所引起的地连墙位移是不同的,地连墙从两边到中间开挖比从中间到两边开挖所产生的水平位移要小,越靠近地连墙长边中部位置,产生的水平位移越大,说明逆作深基坑存在开挖-空间效应,施工时应利用此空间效应优化施工组织设计。

Take a deep foundation pit project in Tianjin for example, the process of foundation pit excavation is simulated by ABAQUS finite element software, the horizontal deformation of the wall of different location in the process of foundation pit excavation under different excavation sequence and different excavation working condition is analyzed. Through analysis and comparison, we recognize that the continuous diaphragm wall displacement caused by different excavation sequence is different, and from both sides to the middle, the horizontal displacement of the wall produced by the excavation may be smaller than the displacement from the middle to both sides by excavation, and closer to the central position of the long side of diaphragm wall, the horizontal displacement is larger, that proved inverse deep foundation pit excavation-space effect exists, the space effect should be covsidered to optimize the construction organization design.