基坑开挖深度对邻近建筑物的影响

Influence of Excavation Depth of Foundation Pit on Adjacent Buildings

摘要: 结合外滩隧道工程实测数据，运用三维快速拉格朗日分析程序FLAC3D研究了基坑不同开挖深度对邻近建筑物的影响。在数值分析过程中，基坑开挖采用分段分层的方式进行，开挖时竖向围护结构的支撑作用通过提高周围土体参数来实现；水平支撑的作用则通过施加定点水平集中力来模拟。由数值模拟结果得到基坑开挖深度引起建筑物沉降的变形规律，据此可根据建筑物允许变形值评估基坑开挖对建筑物的影响程度。

Abstract: Combining with the measured data of bund tunnel project, the effect of excavation depth on the adjacent buildings is studied by using the three-dimensional fast Lagrange analysis program—FLAC3D. In the process of numerical analysis, the excavation of foundation pit is carried out by the way of sub layer, and the supporting role of vertical support structure is realized by improving the parameters of surrounding soil. By numerical simulation results, the deformation law of building settlement caused by excavation depth is obtained, which can be based on the allowable deformation value of the foundation pit to evaluate the influence of foundation pit excavation on the building.