南京地铁盾构施工引起的地表沉降分析

结合南京地铁某区间的盾构施工,分析实测的断面数据,得出盾构推进对地表影响的主区域和次区域,明确了盾构推进时对地表的影响范围。通过对比Peck法计算值和实测值,验证现有的经验参数是否适合南京地区的实际情况。通过对实测曲线的拟合和数值计算得到沉降槽半宽度,改进了地表沉降槽宽度系数的取值范围,有助于盾构法在南京地区的推广和应用。

Analysis on Ground Settlement by Shielding Method in Nanjing Metro

Referring to the shield driven tunnel of Nanji ng Metro,this paper analyzes the monitoring data which helps to make clear the ma in zone and the subordinate zones of ground settlement caused by shield tunnelin g,and compares the calculated results with the monitoring data,so as to verify if the present parameters can accord with the real situation of Nanjing. The distribut ion of surface settlement trough is obtained by one-dimensional wave theory and calculation, and the coefficient of surface settlement trough is modified,which, as the authors argue,will contribute to the extension and application of shieldi ng method in Nanjing.