时序InSAR技术在地铁沿线形变监测中的应用

Application of time series InSAR technology in deformation monitoring along the subway

时序InSAR技术是监测地表形变的一种有效手段。本文基于179景Sentinel-1A影像数据,采用PS-InSAR技术对北京地铁6号线慈寿寺站—潞城站沿线范围进行地表形变监测,并对典型沉降区间进行具体分析;同时利用地面水准数据对监测结果进行对比分析和精度评定。结果表明,北京地铁6号线沿线表现出不同程度的沉降,年均沉降速率呈现自西向东的差异性,金台路站以西年均沉降速率较小,自金台路站向东年均沉降速率迅速增大,最大达-32 mm/a;金台路站以东倾斜值较大,倾斜值波动较为明显,存在不均匀沉降问题。水准测量结果与PS-InSAR监测成果具有较强的相关性,两者平均误差为3.5 mm,中误差为4.7 mm,说明PS-InSAR具有一定的可靠性与准确性。

Time series InSAR technology is an effective means to monitor surface deformation.Based on 179 Sentinel-1A image data,PS-InSAR technology is used to monitor and analyze the surface deformation along the Cishousi station to Lucheng station of Beijing subway Line 6,and the typical settlement interval is analyzed in detail.At the same time,the monitoring results are compared and analyzed and the accuracy is evaluated by using the ground level data.At the same time,the accuracy of monitoring results is evaluated using ground leveling data.The results show that there are different degrees of settlement along Beijing subway Line 6,and the average annual settlement rate is different from west to east.The average annual settlement rate in the west of Jintailu station is small,but it increases rapidly from Jintailu station to east,and the maximum average annual settlement rate is-32 mm/a.The tilt value to the east of Jintailu station is large,and the tilt value fluctuates obviously,which leads to uneven settlement.There is a strong correlation between leveling results and PS-InSAR monitoring results.The average error between them is 3.5 mm and the median error is 4.7 mm,which shows that PS-InSAR has certain reliability and accuracy.