Attribution Analysis on Deformation Feature of the Shanghai Elevated Highway by Persistent Scatterer SAR Interferometry

Elevated highway is one of the major infrastructures in Shanghai spanning 11 administrative regions. In order to ensure its safe operation and sustainable development, high-resolution persistent scatterer interferometric synthetic aperture radar (PS-InSAR) technology is used to monitor and analyze the displacement of the elevated highway, combining with the level data to further verify the monitoring accuracy. The settlement results are basically consistent with the leveling data, and the maximum error does not exceed 3 mm/a.The results of multi-factor attribution analysis show that the settlement pattern of elevated roads is closely related to the land subsidence in the surrounding areas, the dynamic load of the operating vehicles, and the time about elevated road was built.