半盖挖宽大深基坑对临近高层建筑变形影响的数值分析

Analysis of the influence of semi-cover excavation of wide and deep foundation pit on the deformation of adjacent high-rise buildings

基坑开挖过程中,可能会对临近建筑物产生安全影响从而引发工程事故。文中采用MIDAS/GTS NX有限元数值分析软件模拟主体基坑开挖全过程,对施工过程中主体基坑开挖水平位移、竖向位移以及主体基坑开挖引起建(构)筑物结构轴力、弯矩、剪力变化等安全指标进行分析。结果表明:主体围护结构最大变形7.78mm,满足围护结构最大水平位移≤0.15%H,且≤30mm的控制指标要求。研究成果可供类似工程参考和借鉴。

In the process of foundation pit excavation,it may have a safety impact on adjacent buildings and cause engineering accidents.In this paper,the MIDAS/GTSNX finite element numerical analysis method is used to simulate the whole process of the main foundation pit excavation,and the safety indexes such as horizontal displacement,vertical displacement and the change of axial force,bending moment and shear force caused by the main foundation pit excavation are analyzed.The results show that the maximum deformation 7.78mm of the main enclosure structure meets the control index requirements of the maximum horizontal displacement of the enclosure structure≤0.15%H and≤30mm.The research results can be used as a reference for similar projects.