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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.
The excavation of foundation pit has great influence and potential threat to the existing building or building foundation.According to the concrete engineering example, a large three-dimensional Midas / GTS finite element program is used to simulate the excavation of a foundation pit in Xi’an from The effect of excavation depth, excavation distance and excavation gradient on the mechanical effect and deformation characteristics of adjacent building pile foundation are studied.The results show that with the increase of excavation depth, the foundation settlement increases with the increase of excavation depth With the increase of foundation distance, the amount of foundation settlement is far greater than the deformation of horizontal displacement.With the change of pit excavation slope, the displacement and deformation of pile group do not appear sharp increase or sudden drop.