城市建设的迅速发展使得高层建筑及地铁车站的基坑越来越深，开挖将引起较大的基坑回弹，随之产生的过大基坑立柱回弹将引起结构自身的内力重分布，同时会对周围建筑物和地下管线等造成影响。文中系统地搜集整理了天津地铁5、6号线车站的基坑立柱回弹实测数据，并进行了统计分析研究。结果表明，立柱回弹最大值约为平均值的1.2倍，顺作法地下2层站基坑（15～18 m深）和3层站基坑（24～26 m深）平均立柱回弹值分别处于5～40 mm和30～55 mm范围，且回弹值均不超过基坑深度的0.25%。随着地连墙插入比的增加，立柱回弹相应减小，立柱回弹值随着围护结构变形的增大而增大，可见控制围护结构变形可以有效地减小立柱回弹；逆作法基坑立柱回弹较顺作法显著减小，均值在3～10 mm范围，仅相当于相同深度顺作法基坑立柱回弹的1/10～1/3，利用模糊统计得出天津地区开挖深度在15～18 m范围的基坑，正常立柱回弹的取值范围15～25 mm。

With the rapid development of urban construction, the excavations of high-rise buildings and metro stations are becoming increasingly deeper. Consequently, the excavation will lead to a very large basal heave deformation and a very large center post upheaval, which will cause the redistribution of the internal forces in the supporting structures, and simultaneously influence the surrounding buildings and underground pipes. Through statistical analysis of the measured data of the center post upheaval in metro station excavations of Tianjin metro line 5 and line 6, the following conclusions can be derived. The maximum value of center post upheavals is approximately 1.2 times of the average value in an excavation. The average values of center post upheavals in excavations of two-level (15-18 m deep) and three-level (24-26 m deep) metro stations range from 5 to 40 mm and 30 to 55 mm, respectively. The ratios of center post upheavals to depth of excavations are less than 0.25%. The center post upheaval decreases as the embedded ratio of the diaphragm wall increase, and increases as the deformation of the diaphragm wall becomes larger. Therefore, controlling the deformation of the retaining structure would be an effective way to reduce the center post upheaval. The average value of center post upheavals in the excavations using the top-down construction method is much smaller than that using the bottom-up construction method, which ranges from 3 mm to 10 mm, equaling to 1/10-1/3 of that using the bottom-up construction method. Through fuzzy statistics, the normal center post upheaval in metro station excavations with depth of 15 to 18 m ranges from 15 mm to 25 mm.