基于PSInSAR技术的上海长江大桥变形监测方法研究

Deformation monitoring approach of Shanghai Yangtze River Bridge based on PSInSAR

桥梁稳定性监测是桥梁基础设施结构安全监测和健康状况评估的重要内容之一。InSAR技术以其全天时、全天候、大范围和连续覆盖的监测优势,可以在城市基础设施变形监测中充分发挥作用。文章基于PSInSAR技术对桥梁开展变形监测技术研究,建立以Sentinel-1 SAR影像为监测数据、SNAP为SAR影像数据预处理工具、StaMPS为桥梁形变信息提取工具的桥梁变形监测方法。采用2018—2020年86景Sentinel-1影像对上海长江大桥进行变形监测与分析,验证了PSInSAR技术在大跨径桥梁变形监测中的适用性,并对上海长江大桥形变状况进行评估,为桥梁运营管理决策提供技术支持。

Bridge stability monitoring is one of the most important contents for structure safety monitoring and health evaluation of bridge infrastructure.InSAR can play a full role in deformation monitoring of urban infrastructure with the advantages of all-day,all-weather,long-scale and continuously covering monitoring.This paper studies the deformation monitoring technology of bridges based on PSInSAR and establishes a bridge deformation monitoring approach using Sentinel-1 SAR images as monitoring data source,SNAP as SAR image preprocessing tool and StaMPS as bridge deformation extraction tool.In this paper,a total number of 86 Sentinel-1 images obtained from 2018 to 2020 are used to monitor and analyze deformation of Shanghai Yangtze River Bridge,and verify the applicability of PSInSAR in deformation monitoring of long-span bridges.The deformation of Shanghai Yangtze River Bridge is thus evaluated,which provides technical support for operation and management decisions of the bridge.