深基坑开挖对临近建筑物浅基础影响分析

ANALYSIS OF INFLUENCE OF DEEP FOUNDATION PIT EXCAVATION ON SHALLOW FOUNDATION OF ADJACENT BUILDINGS

为研究深基坑开挖对临近建筑浅基础的影响,采用有限元软件ABAQUS模拟基坑开挖过程,对临近建筑物条形基础的位移与应力变化进行研究。研究表明,基坑开挖会导致建筑物有整体向基坑所在方向倾覆的趋势,基坑开挖深度越大,基础远近两侧的沉降差值越大,倾覆趋势越明显。随着基坑开挖深度的增加,基础的沉降量增大,基底应力增大。随着地连墙刚度的增大,基础的沉降及远近两侧沉降差减小,地连墙刚度较大时,增加刚度的作用就不再明显。地连墙刚度降低,易引起基础底部与基础顶部的不均匀水平位移。

In order to study the influence of deep foundation pit excavation on the shallow foundation of adjacent buildings, the finite element software ABAQUS was used to simulate the foundation pit excavation process, and the displacement and stress changes of the strip foundation of adjacent buildings were studied. The research shows that the foundation pit excavation will lead to the tendency of the building to tip overin the direction of the foundation pit. The greater the excavation depth of the foundation pit, the larger the settlement difference between the two sides of the foundation, the more obvious the overturning trend. As the excavation depth of the foundation pit increases, the foundation settlement increases and the base stress increases. With the increase of the stiffness of the ground joint wall, the settlement of the foundation and the settlement difference between the two sides are reduced.When the stiffness of the ground joint wall is large, the effect of increasing the stiffness is no longer obvious. The rigidity of the ground wall is reduced, which is easy to cause uneven horizontal displacement of the foundation bottom and the foundation top.