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以某地铁车站深基坑为背景,对施工期间的围护墙体水平位移、墙体沉降、地下水位、钢支撑轴力和立柱隆沉等监测数据进行分析。实测结果表明:基坑开挖到基底时,坑壁2/3深度处水平变位最大,达7.57 mm;钢支撑轴力远小于设计值,有较大的空间可以利用,可对设计进行优化;地下水位的变化说明车站的施工未对周围环境造成太大影响;坑底最大隆起值为13.8 mm,墙体最大水平变位7.5 mm,地表沉降最大值为-2.4 mm,均远小于警戒值。监测数据及分析表明,基坑采用地下连续墙加3道支撑的支护方案是安全可行的。
Taking the deep foundation pit of a metro station as a background, the monitoring data of horizontal displacement of retaining wall, wall settlement, groundwater level, axial force of steel support and uplift of column are analyzed. The measured results show that when the foundation pit is excavated to the base, the horizontal displacement at the depth of 2/3 of the pit wall is the largest, reaching 7.57 mm. The axial force of the steel support is much smaller than the designed value, and the space can be utilized to optimize the design The change of groundwater level indicates that the construction of the station has not caused much impact on the surrounding environment. The maximum value of pit bottom is 13.8 mm, the maximum horizontal displacement of wall is 7.5 mm and the maximum value of surface settlement is -2.4 mm, . Monitoring data and analysis show that it is safe and feasible to use the foundation pit supported by the diaphragm wall with 3 supports.