深基坑支护逆作法施工过程三维空间分析

以上海恒积大厦基坑逆作法为工程背景,采用Flac有限元计算软件对基坑的逆作施工过程进行了三维模拟,重点模拟了土体-结构之间的相互作用。分析了基坑围护墙体的侧向变形和沉降、基坑开挖中楼板的变形以及基坑土体沉降,尤其对基坑开挖过程中立柱和墙体的差异沉降进行了讨论。针对逆作法特有的工程工艺分析了取土孔位置、立柱上浮、差异沉降以及围护墙侧移等工程因素的影响,并提出了相应的控制手段。

Space Analysis on Support of Deep Pit and Top-down Construction

Based on the top-down construction of Hengji mansion in Shanghai,Flac software is used to simulate the process of top-down construction,especially the mutual action between soil and structure.The level and vertical displacement of support-wall,deformation of slab and settlement of soil are analyzed in the process of excavation.The difference settlement between piles and support-wall is discussed.Aimed at particular techniques of top-down construction,influence factors including position of soil pore,elevator of pillar,difference settlement and deformation of support wall are analyzed,and the corresponding control method is proposed.