时序InSAR技术在太原地铁沿线形变监测中的应用

Application of time series InSAR technology in deformation monitoring along Taiyuan Metro

城市轨道交通的建设与运营会引起地铁沿线的持续形变而造成地面沉降,给地面及地下基础设施带来安全隐患。为了解太原市首次开通运营太原地铁二号线一期线路以来沿线地面形变情况,以二号线一期工程沿线为研究对象,使用2020年6月至2021年11月共20景Sentinel-1A影像,基于永久散射体、小基线集技术对研究区进行地面形变监测。研究表明,两方法所得沉降分布情况、形变时序分析结果有很高的一致性,线路沿线最大沉降为31.96 mm,最大沉降速率为32 mm/a,存在三个较明显的沉降区域,推断与其处于大规模的不断的城市建设区域密切相关。本次研究可为后续太原市地铁建设沿线地表形变监测提供参考。

The construction and operation of urban rail transit will cause continuous deformation along the metro line and cause land subsidence,which will bring security risks to the ground and underground infrastructure.In order to understand the ground deformation along the first phase of Taiyuan Metro Line 2 since the first operation of Taiyuan City,taking the line along the first phase of Line 2 as the research object,a total of 20 Sentinel-1A images from June 2020 to November 2021 were used,based on permanent scatterers(PS)-interferometric synthetic aperture radar(InSAR),small baseline subset(SBAS)-InSAR technology to monitor the ground deformation of the study area.The research shows that the subsidence distribution and deformation timing analysis results obtained by the two methods were highly consistent.The maximum subsidence is 31.96 mm and the maximum subsidence rate in the study area is 32 mm/a.There are three obvious settlement areas,and it is inferred that it is on a large scale and continuous urban construction area.This study can provide a reference for the ground monitoring of surface deformation along the subway construction in Taiyuan.