基于开挖方法对深基坑变形的分析与施工优化

为研究开挖方式对深基坑变形分析与施工优化,采用有限元软件FLAC3D对上海某深基坑开挖进行模拟.通过改变开挖方式,在数值计算中设置若干种工况,研究开挖过程中的基坑围护结构位移变化、地表沉降.研究结果表明:3种不同的开挖方法对于基坑变形的控制能力依次是台阶式退挖、跳挖、竖向顺序分层开挖.在采用了新的开挖方式后,基坑周边的最大沉降值也由之前的10 mm左右减小到8 mm左右,基坑围护结构最大水平位移由原来的45 mm减小到40 mm,说明新的开挖方式有效的控制了深基坑变形.

Deformation analysis and construction optimization of deep foundation pit based on excavation method

To study the deformation analysis and construction optimization of deep foundation pit by excavation methods, the finite element software FLAC3D was used to simulate the excavation of a deep foundation pit in Shanghai. By changing the excavation method and setting several working conditions in the numerical calculation, the displacement change and surface settlement of the retaining structure of foundation pit during excavation are studied. The results show that the control ability of three different excavation methods for foundation pit deformation is step back excavation, jumping excavation and vertical sequential layered excavation. After adopting the new excavation method, the maximum settlement around the foundation pit is reduced from about 10 mm to about 8 mm, and the maximum horizontal displacement of the retaining structure of the foundation pit is reduced from 45 mm to 40 mm.It shows that the new excavation method effectively controls the deformation of deep foundation pit.