Longitudinal ground settlements caused by shield tunneling are analyzed by monitoring data . the settlements in different period are concluded . the settlements of different distance away from the incision are compared which possesses an important significance for construction 3 、通过对南京地铁盾构区间实测数据的分析，研究盾构推进过程对纵向地表沉降的影响过程，总结了南京地区盾构推进时各阶段沉降量占总沉降量的百分比，比较了盾构施工时距切口不同距离地表的沉降情况，对指导施工有重要意义。
