深基坑开挖对邻近既有独立基础变形的影响

Analysis of effect on adjacent existing isolated foundations by excavation of deep foundation pits

针对深基坑开挖对近邻既有独立基础变形的影响问题,应用有限元软件ABAQUS建立包括基坑、土体、独立基础在内的整体模型,分析基坑开挖深度、建筑物与基坑间距、连续墙厚度及嵌固深度等因素对基坑近邻独立基础沉降量与水平位移的影响。分析表明:开挖深度对基础沉降量的影响程度大于其对基础水平位移的影响程度。建筑物与基坑间距对基础沉降的影响远大于对水平位移的影响,当间距大于1.0H时,对基础沉降基本没有影响。连续墙厚度对独立基础水平位移的影响较大,对沉降的影响较小。增加连续墙的嵌固深度对临近独立基础沉降与水平位移的影响程度较接近。

This paper describes an in-depth study targeted at eliminating the effect on adjacent existing isolated foundation deformation by excavation of deep foundation pit. The study involves using the finite element software ABAQUS to develop the whole model including foundation pit,soil and isolated foundation and analyzing the effect on settlement and horizontal displacement of adjacent isolated foundation by excavation depth,space between building and foundation pit,thickness and embedded depth of continuous wall. The analysis demonstrates that the excavation depth exerts a greater effect on the settlement of foundation than on the horizontal displacement; the space between building and foundation pit yields a much larger impact on the settlement of foundation than on the horizontal displacement and if larger than 1. 0H,produces virtually no effect on the settlement of foundation; the thickness of continuous wall gives a greater impact on the horizontal displacement of foundation and a less impact on the settlement; and the increased embedded depth of continuous wall has almost an identical effect on the settlement and horizontal displacement of adjacent existing isolated foundation.