基坑开挖对邻近桩基础的影响研究

摘要

In view of the foundation pit excavation of adjacent existing buildings or have large influence on the foundation and potential threats. For a practical engineering,a large three-dimensional Midas/GTS finite element calculation program is used to conduct numerical simulation for a foundation pit excavation engineering in Xi ’an. The effects of depth,distance and slope of foundation pits on mechanical response and deformation characteristics of adjacent pile foundations are studied. The results show that with the increase of excavation depth ,the foundation settlement increases continuously. With the increase of excavation and foundation pitch,the foundation settlement is far greater than the deformation of horizontal displacement. As the change of excavation slope ,the displacement and deformation of pile group doesn’t increase or decrease suddenly.%基坑开挖对邻近已有建筑或建筑基础存在较大的影响和潜在的威胁。结合具体工程实例，应用大型三维Midas/GTS有限元计算程序对西安某基坑开挖工程进行数值模拟，从基坑开挖深度、开挖距离和开挖坡度对临近建筑桩基影响的力学效应和变形特征进行研究。计算结果表明：随开挖深度的增加，基础沉降量不断增加。随着基坑与基础间距的增加，基础沉降量远大于水平位移的变形量。随着基坑开挖坡度的变化，群桩位移，变形并未出现陡增或骤降。