地下开挖引起的地表沉降是地铁修建过程中非常关键的问题．在文章中,以盾构法施工的某地铁隧道试验段的实测地表变形数据,分析了地表变位的特点,得到几点定性规律,并用Peck公式对实测点进行拟合,发现沉降曲线与正态分布曲线非常接近．将拟合结果与以往经验公式进行了对比,发现两者吻合较好． Surface subsidence caused by underground excavation is a very crucial issue in the construction of subway. In this paper, the measured surface deformation data of a subway tunnel test section constructed by the shield method are used to analyze the characteristics of surface displacement. Some qualitative laws are obtained and the measured points are fitted by Peck’s formula. It is found that the settlement curve and the positive State distribution curve is very close. The fitting result is compared with the previous empirical formula and it is found that the two agree well with each other.