Ground Subsidence Monitoring And Analysis In Beijing Plain Area Based On Time Series InSAR Technique

The Beijing Plains area is located in the southeast of Beijing and is an integral part of the North China Great Plains.The long-term over-exploitation of groundwater has caused severe land subsidence in the area,affecting the city's planning and construction and sustainable development.The concern of the government and all walks of life.Interferometry Synthetic Aperture Radar technology is widely used in the field of ground subsidence monitoring by virtue of its advantages of all-weather,all-weather,wide range,full coverage and short period.Aiming at the problem of ground subsidence in the Beijing Plain,this article uses 30 Sentinel-1A satellite image data based on two time-series InS AR techniques based on Small Baseline Subset Technique and Interferometric Point Target Analysis The spatial distribution information of the ground subsidence in the region from 2017 to 2019 was obtained,and the driving factors of the ground subsidence in the study area were discussed in combination with the relevant data.Based on the settlement results,the settlement characteristics of the subway lines and highways in Beijing were analyzed.The study found that there are multiple settlement centers in the east,north and south of the Beijing Plain,and the uneven ground settlement characteristics are obvious.The spatial distribution of the settlement area is related to driving factors such as urban construction,population,industrial distribution,tectonic movement,and stratum structure;affected by ground settlement,the original design slope of the subway track has changed slightly,affecting the speed of the train and the passenger's Driving experience,since the Beijing section of the Beijing-Taiwan Expressway opened to traffic in late 2016,there have been four subsidence sections,located near Beiyechang Bridge,Weishanzhuang Toll Station,Anding Toll Station and Tenziqiao Toll Station.The relevant conclusions of this article can provide references for the prevention and control of land subsidence in Beijing and the safe operation of traffic lines.