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桩锚支护结构是深基坑常用的支护形式之一,在工程中已获得广泛应用。深基坑开挖后再次开挖内坑会对基坑整体稳定性与变形造成不利的影响。依据合肥市滨湖新区恒大中心深基坑为原型,基于Flac3d数值模拟,分析了坑趾系数、内外坑深度比、外坑支护结构插入比对基坑整体稳定性及变形的影响。分析结果表明:该基坑坑中坑支护设计是可靠和安全的;内坑施工对基坑整体稳定性及围护结构最大变形的影响随坑趾系数、外坑支护结构插入比的增大而减小,随内外坑深度比的增大而增大;内外坑深度比和坑趾系数的变化对基坑整体稳定性及围护结构最大变形的影响皆敏感,且对围护结构最大变形的影响更为显著。
Pile-anchor supporting structure is one of the commonly used support forms for deep foundation pit and has been widely used in engineering. Excavation of deep foundation pit excavation pit again will affect the overall stability and deformation of the pit adversely affected. According to the deep foundation pit of Hengda Center, Binhu New Area, Hefei, based on the numerical simulation of Flac3d, the influence of pit toe coefficient, the depth ratio of inner and outer pits, and the ratio of outer pit supporting structure to the overall stability and deformation of the foundation pit were analyzed. The results show that the pit pit support design is reliable and safe. The effect of pit construction on the overall stability of the foundation pit and the maximum deformation of the retaining structure increases with the pit-to-toe coefficient and the insertion ratio of the pit support structure And decreases with the increase of the depth ratio of inner and outer pits. The variations of depth ratio and pit-to-toe coefficient of inner and outer pits are sensitive to the overall stability of the foundation pits and the maximum deformation of the envelope, The effect of deformation is more pronounced.