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坑角效应是基坑空间效应的具体体现之一,它对建筑物的沉降形态有显著的影响。以盘锦渤海路地下商业街基坑工程为依托,通过FLAC3D数值计算,研究坑角部位建筑物受基坑开挖影响的变形特点。计算结果表明:坑角附近的建筑物在垂直基坑和沿基坑方向均发生不均匀沉降,表现为三维沉降状态;建筑物的存在会显著改变基坑周围土体的位移场;基础刚度对建筑物沉降影响较小,而基础埋深则会明显的影响建筑物变形;划分环境保护等级时,应考虑建筑物对位移场的影响。
The pit angle effect is one of the concrete manifestation of the space effect of the pit, which has a significant impact on the settlement form of the building. Based on the engineering of underground commercial underground pits of Bohai Sea Road in Panjin, FLAC3D numerical calculation was used to study the deformation characteristics of the buildings in the pit corners affected by excavation. The calculation results show that the buildings near the pit angle are unevenly subsided in both the vertical foundation pit and the foundation pit, showing a three-dimensional settlement state; the presence of the building will significantly change the displacement field of the soil around the foundation pit; The settlement of the building has less influence, while the basic depth will obviously affect the deformation of the building. When classifying the environmental protection level, the influence of the building on the displacement field should be considered.