Abstract Extra-large complex deep foundation pit excavation has an impact on the surrounding environment. The deformation characteristics of deep foundation pits were investigated during excavation, according to the temporal and spatial variations in displacement, using long-term on-site displacement monitoring. The results show that the deformation characteristics of the supporting structure and surrounding buildings can be divided into four stages: earth excavation, cushion construction, internal support removal and cushion completion. In the stages of earthwork excavation and support removal, the settlement deformation of the supporting pile roof, lattice column and adjacent ground is large, and cushion construction has a weakening effect on foundation pit deformation. In the stages of earthwork excavation, cushion construction and internal support removal, the nonuniform settlement between adjacent lattice columns increases the lattice column deformation, and the deformation of the foundation pit tends to be stable after the completion of the internal support. The foundation pit excavation mainly affects the settlement deformation of the adjacent pipe gallery, and its deformation increases rapidly in the early stage of earthwork excavation. Moreover, the influence degree of foundation pit excavation on the surrounding environment decreases with increasing distance from the excavation area.

中文翻译：

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特大型复杂深基坑对邻近环境影响的监测分析——以郑州市为例

摘要 特大型复杂深基坑开挖对周边环境产生影响。根据位移的时空变化，采用长期现场位移监测，研究了深基坑在开挖过程中的变形特征。结果表明，支护结构及周边建筑物的变形特征可分为土方开挖、垫层施工、内部支护拆除和垫层完成4个阶段。在土方开挖和支护拆除阶段，支护桩顶、格柱及相邻地基沉降变形较大，垫层施工对基坑变形有弱化作用。在土方开挖阶段，垫层施工和内支架拆除，相邻格柱间的不均匀沉降增加了格柱变形，内支架完成后基坑变形趋于稳定。基坑开挖主要影响相邻管廊的沉降变形，其变形在土方开挖初期迅速增大。而且，基坑开挖对周围环境的影响程度随着距开挖区距离的增加而减小。基坑开挖主要影响相邻管廊的沉降变形，其变形在土方开挖初期迅速增大。而且，基坑开挖对周围环境的影响程度随着距开挖区距离的增加而减小。基坑开挖主要影响相邻管廊的沉降变形，其变形在土方开挖初期迅速增大。而且，基坑开挖对周围环境的影响程度随着距开挖区距离的增加而减小。