基于PS-InSAR技术的地铁施工地表沉降监测与分析

Monitoring and Analysis of Ground Settlement in Metro Construction Based on PS-InSAR Technology

提出了基于永久散射体合成孔径雷达干涉(PS-InSAR)技术的地铁施工地表沉降监测的可视化及分析方法,在天津地铁6号线渌水道至双港进行了应用。结果表明,施工前,车站周边地表累计沉降不大,地表较为稳定,盾构穿越线路上的微山路桥及环美公寓七号楼沉降较大。施工过程中,通过对PS-InSAR结果每一期的地表沉降及永久散射体(PS)点的时间序列沉降信息进行分析,发现了6处沉降较为明显的地点,这些PS点的时间序列沉降趋势在施工前后产生了明显的变化。采用施工过程中的地表水准监测数据对PS-InSAR监测结果进行了验证,平均误差为2.56 mm。

A visualization and analysis method based on permanent scatterer synthetic aperture radar interferometry(PS-InSAR)technology for ground settlement monitoring in metro construction is proposed,which has been applied in Ludao Shuanggang of Tianjin Metro Line 6.The results show that before construction,the accumulated ground settlement around the station is not large,the ground is relatively stable,and the settlement of Weishan Road Bridge and Huanmei Apartment Building 7 on the shield crossing line is large.During the construction,through the analysis of the surface settlement of each phase of the PS-InSAR results and the time series settlement information of the permanent scatterer(PS)points,six sites with obvious settlements were found,and the time series settlement trend of these PS points changed significantly before and after the construction.The monitoring results of PS-InSAR are verified by the surface level monitoring data during the construction,and the average error is 2.56 mm.