基于时序InSAR技术的中贵天然气管道天水市段沿线滑坡隐患识别与形变分析

中贵天然气管道天水市段沿线地处黄土高原,地貌类型多样、构造活跃、复杂地质条件下发育多种具有隐蔽性和潜伏性的地质灾害,其中滑坡灾害对中贵天然气管道的安全危害极大,因此,对中贵天然气管道天水段沿线滑坡隐患进行有效识别与分析具有重要意义。本文采用Sentinel-1A升降轨卫星数据,基于时序InSAR对中贵天然气天水段沿线滑坡隐患进行了解译识别、现场复核、发育特征与典型滑坡形变分析。研究区共识别17处滑坡隐患点,现场复核最终确定13处,其余4处为人类工程活动区,其中常沟村和磨峪沟村滑坡形变受降雨影响。统计发现研究区管道沿线滑坡多发生在坡度40~50°,高差400~600 m,东北坡向和距管道100~150 m范围内,且岩土体强度较低,地层以第四系全新统冲洪积层（Q4a1+p1）为主。研究成果证明,联合升降轨的时序InSAR技术可以有效识别管道沿线滑坡隐患,为油气管线的安全运营及今后油气管道选线提供重要的科学依据和参考。

Landslide Hazard Identification and Deformation Analysis along the Tianshui City Section of the China-Guizhou Natural Gas Pipeline Based on Time-series InSAR Technology

The Tianshui section of the China-Guizhou natural gas pipeline is located on the Loess Plateau, which is characterised by diverse geomorphological types, active tectonics, and complex geological conditions, and a variety of hidden and latent geological hazards. In this paper, we use Sentinel-1A ascending and descending satellite data to decode and identify landslide hazards along the Tianshui section of the Zhonggui natural gas pipeline based on time-series InSAR, field review, development characteristics and typical landslide deformation analysis. A total of 17 landslide hazards were identified in the study area, 13 of which were finally identified in the field review, while the remaining four were areas of human engineering activities, among which the landslide deformation in Changgou and Moyugu villages was affected by rainfall. It was found that most of the landslides along the pipeline in the study area occurred at slopes of 40-50°, with a height difference of 400-600 m, within 100-150 m from the pipeline in the northeastern slope direction, and the geotechnical body is of low strength and the stratigraphy is dominated by Q4al.. The results of the study prove that the time-series InSAR technology with combined lift and rail can effectively identify landslide hazards along the pipeline, providing an important scientific basis and reference for the safe operation of oil and gas pipelines and future oil and gas pipeline selection.