上海市地铁沿线地表沉降PS-InSAR监测应用

Application of PS-InSAR Technique in Monitoring Ground Subsidence along Shanghai Metro Line

以上海市地铁网络为监测对象,收集了2017年1月到2021年1月136景Sentinel-1影像,应用PS-InSAR技术获取了地铁沿线两侧各100 m范围内的形变分布情况,并将InSAR监测结果与2016年12月至2020年12月地铁沿线水准测量结果加以对比。结果表明:InSAR结果与水准测量结果具有较好的一致性,垂直方向上InSAR测量结果与水准测量结果的均方根误差为3.73 mm/a;根据InSAR监测结果,监测期间地铁沿线的年平均形变速率分布在-41.84~10.61 mm/a,92.61%的监测点形变速率介于-5~5 mm/a,可认为监测范围内大部分区域处于比较稳定的状态;对11号线(迪士尼—嘉定北)、13号线形变速率开展纵断面分析,分析表明利用InSAR技术有利于快速聚焦形变异常区域,全面、及时地掌握地铁沿线沉降变化情况,对精细化监测地铁沿线变形有重要意义。

Taking Shanghai metro network as an example,based on 136 Sentinel-1 images from January 2017 to January 2021,the deformation within 100 m of each side of the metro was obtained using time-series InSAR technology.InSAR measurements were compared with the leveling measurements from December 2016 to December 2020 along the metro.The results show that:InSAR measurements are in good agreement with leveling measurements,the root mean square error of InSAR and leveling measurements in vertical direction is 3.73 mm/a.According to the InSAR measurements,the average annual deformation rate along the metro line during the monitoring period was between-41.84 and 10.61 mm/a,and the deformation rate of 92.61%of the monitoring points was between-5 and 5 mm/a,suggesting that most areas within the monitoring range were relatively stable.The profile variation analysis of deformation rate was carried out on Line 11(Disneyland-Jiading North)and Line 13,and the deformation anomaly area along the metro line was quickly focused.InSAR technology was conducive to the comprehensive and timely grasp of the settlement variation along the metro line,and it was of great significance to the fine monitoring of the deformation along the metro line.