Deformation monitoring of viaduct in Hohhot based on Sentinel-1 data

Abstract

Aiming at the problem that the traditional viaduct deformation monitoring has high accuracy but long monitoring period and consumes a lot of manpower and material resources, it is difficult to extract the severe deformation area of viaduct in time. In this paper, based on the small baseline set interferometric synthetic aperture radar (SBAS-InSAR) technology, the deformation information of viaducts and surrounding areas is retrieved, and the severe deformation areas of urban viaducts and surrounding areas are extracted. Taking three viaducts with large traffic flow in Hohhot as the research object, the deformation results of the study area from August 2020 to September 2021 were obtained. The deformation causes are analyzed combined with the inversion results. The results show that there are five large deformation areas in the three viaducts, and the main deformation causes include soil erosion or urban waterlogging caused by rainfall, surface construction and rail transit operation. The research shows that this method can accurately extract the severe deformation area of urban viaducts, and provide a reference for analyzing the causes of viaduct deformation.