关键词: 川藏铁路, 潜在滑坡识别, SBAS-InSAR, Sentinel-1A

Abstract: [Purposes] The Lhasa-Sangri section of the Sichuan-Xizang Railway lies within the complex tectonic zone of the Gangdise Mountains on the Qinghai-Xizang Plateau,where landslides are frequent.Accurate identification of potential landslide risk zones is essential for ensuring railway construction and operational safety. [Methods] This study focuses on a 10 km buffer zone along the Lhasa-Sangri section.Using Sentinel-1A ascending and descending orbit data from 2021 to 2023 and the SBAS-InSAR technique,surface deformation was retrieved. [Findings] The deformation rates of ascending and descending tracks in the research area are -41.33 to 15.74 mm/a and -54.45 to 13.9 mm/a,respectively.Two-dimensional decomposition was performed to obtain vertical and east-west deformation components.Combined with high-resolution optical imagery,90 potential landslide were identified.All identified zones are located in high or above landslide susceptibility areas,and the creep index α values are all greater than 0,indicating that the potential landslides are in a slow accelerating deformation stage. [Conclusions] This approach provides scientific support for forecasting,and disaster prevention of landslides along the Sichuan-Xizang Railway.

Key words: Sichuan-Xizang Railway, potential landslide identification, SBAS-InSAR, Sentinel-1A