Subsidence Monitoring and Development Control in Shanghai Metro Protection Zones Using InSAR and QGIS System

Abstract

This study focuses on the metro protection zone in Shanghai as the research object, utilizing InSAR technology and the QGIS system to monitor and analyze subsidence in the metro protection zone, and proposes development control suggestions. The research is based on Sentinel-1 satellite data and employs the SBAS-InSAR method to obtain the spatiotemporal distribution of land subsidence in Shanghai from 2021 to 2023. Through the QGIS platform, cursive multi-source auxiliary data, including groundwater level variation, distribution of foundation pit engineering, and Shanghai City metro network information, integrates the analysis of subsidence monitoring in metro protection zones to reveal its part of subsidence mechanisms. Propose a dynamic adjustment method for the scope of metro protection zones based on actual subsidence risks, recommending the inclusion of risk factors such as measured settlement rates and soft soil thickness in the criteria for defining the protection zones to make the division of protection zones more scientific and reasonable, thereby enhancing land resource utilization efficiency.