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通过对上海临港新城某半圆形基坑实测数据的分析,结合对半圆形基坑结构优势、变形特性的综述,探讨了半圆形基坑围护结构变形、地表沉降的一般规律。结果表明:该半圆形基坑围护结构的最大侧向位移为开挖深度的0.152%~0.636%,平均值为0.325%;围护结构侧向变形通常为深层凸鼓形,围护结构最大侧移点深度一般位于开挖面以下2~6 m;基坑周边最大地表沉降为开挖深度的0.587%,平均值为0.312%。在相同地质和施工条件下,和矩形基坑相比,半圆形基坑结构形式对控制变形有一定优势。
Through the analysis of the measured data of a certain semi-circular foundation pit in Lingang New City in Shanghai, combined with the structural advantages and deformation characteristics of the semi-circular foundation pit, the general laws of deformation and surface settlement of the semi-circular foundation pit enclosure are discussed. The results show that the maximum lateral displacement of the retaining structure of the semi-circular foundation pit is 0.152% -0.636% of the excavation depth and the average is 0.325%. The lateral deformation of the retaining structure is usually convex, The maximum lateral displacement depth is generally 2 ~ 6 m below the excavation face; the maximum surface settlement around the foundation pit is 0.587% of the excavation depth with an average of 0.312%. Under the same conditions of geology and construction, compared with rectangular foundation pit, the structure form of semi-circular foundation pit has certain advantages for control deformation.