Three-dimensional finite difference software FLAC3D was employed to simulate a staged excavated and supported irregular foundation pit, considering the influence of adjacent existing buildings. And the spatial effect was analyzed. The results indicate that irregular foundation pit has obvious spatial effect. The stress and deformation of concave corner tend to be small. One times the depth of excavation distance from pit corner is the main influence range of pit corner effect, and the deformation of long side effect will be shown beyond three times the depth of excavation distance. The deformation of mid-span retaining structure is larger than others. The horizontal displacement curve of retaining structure shows approximately a "parabola" along the depth. The adjacent existing buildings have great influence on the retaining structure deformation.%运用FLAC3D三维有限差分软件,对某异形基坑开挖与支护进行模拟,同时考虑相邻既有建筑物荷载影响,分析了异形基坑的空间效应.结果表明:异形基坑存在明显空间效应,阴角受力变形往往较小,距坑角1倍开挖深度距离内为坑角效应主要影响范围,超出3倍开挖深度后表现出长边效应,跨中部位变形往往较大.围护结构水平位移曲线沿深度大致呈"抛物线"形.相邻既有建筑物对围护结构变形有较大影响.
展开▼
