基于FLAC3D分析深基坑开挖过程对毗邻区域的影响

The Impact of Deep Foundation Pit Excavation Process on the Surrounding Adjacent Areas based on FLAC3D Analysis

为有效预控深基坑工程施工风险,采用FLAC3D数值模拟软件,以某地铁车站深基坑工程为研究对象,通过模拟深基坑土方开挖、内支撑搭设等工况,分析深基坑开挖过程对毗邻区域的影响。研究得出了深基坑开挖各工况状态下,基坑周边地表沉降的特征规律及发展趋势,即沉降曲线表现为凹形形状,且沉降量随土方开挖深度增加而加大,此外,深基坑围护结构水平方向位移特征整体呈现为弓形曲线形状,围护结构同一位置的水平位移随基坑开挖深度增加也相应增加。

In order to effectively pre-control the construction risks of deep foundation pit engineering,FLAC3D numerical simulation software was used to study the deep foundation pit engineering of a subway station.By simulating the working conditions of deep foundation pit excavation,internal support installation,etc.,the impact of deep foundation pit excavation process on the surrounding adjacent areas was analyzed.The research had obtained the characteristic law and development trend of surface settlement around deep foundation pit excavation under various working conditions,that is,the settlement curve shows a concave shape,and the settlement amount increases with the increase of soil excavation depth.In addition,the horizontal displacement characteristics of the deep foundation pit retaining structure as a whole show a bow curve shape,and the horizontal displacement of the same position of the retaining structure also increases with the increase of excavation depth.