输电线路杆塔边坡稳定性分析  

Slope stability analysis for transmission line towers

作　　者：刘明 郭金根 朱文卫 董晗拓 LIU Ming;GUO Jingen;ZHU Wenwei;DONG Hantuo(Power Grid Planning Research Center,Guangdong Power Grid Co.,Ltd.,Guangzhou 510000,China)

机构地区：[1]广东电网有限责任公司电网规划研究中心,广州510000

出　　处：《安全与环境学报》2025年第3期968-977,共10页Journal of Safety and Environment

摘　　要：利用短基线集合成孔径雷达干涉测量(Small Baseline Subset Interferometric Synthetic Aperture Radar,SBAS-InSAR)技术对广州市内输电线路杆塔进行形变监测,评估其稳定性并识别潜在的地质灾害风险点。选取广州市内的木增科北线路为研究对象,使用SBAS-InSAR技术处理45景Sentinel-1 SAR数据,获取杆塔区域的地表形变信息。同时,利用确定性系数法评估影响因子对滑坡发生的敏感度。结果表明,木增科北线整体稳定,特定区域有沉降漏斗,最大年平均沉降速率为-113 mm/a。分析发现高程对滑坡敏感度最高,坡度次之,确认了杆塔沿线形变特征及几个关键监测区域,揭示了影响滑坡的主要因素,为线路维护和灾害预防提供依据。This study employed Small Baseline Subset Interferometric Synthetic Aperture Radar(SBAS-InSAR)technology to monitor the deformation of transmission lines and towers in Guangzhou.The primary objective was to assess their stability and identify potential geological hazard risk points.The Muzengke North Line was selected as the focal research area for this analysis.For the SBAS-InSAR processing,we initially acquired 45 images of Sentinel-1 Synthetic Aperture Radar(SAR)data.A time baseline threshold of 120 days was established to account for the gradual deformation of the towers,ensuring that trends could be effectively captured while maintaining data accuracy.Simultaneously,a space baseline threshold of 5%was established to minimize the effects of variations in terrain and satellite orbits.To enhance data quality,the Goldstein filter algorithm was employed to reduce noise in the interferogram,thereby improving the signal-to-noise ratio.Subsequently,a series of processing steps-including phase unwrapping,Singular Value Decomposition(SVD),and various phase and deformation calculations-were conducted to obtain the surface deformation information for the tower area.Additionally,the deterministic coefficient method was employed to assess the sensitivity of influencing factors related to landslide risk.The results indicate that the Muzengke North Line is generally stable.However,certain areas exhibit a significant settlement funnel phenomenon,with a maximum average annual settlement rate of-113 mm/a.Analysis of influencing factors reveals that elevation is the most critical variable affecting the likelihood of landslides,surpassing other factors such as slope,relief degree,and slope direction.For instance,within the elevation range of 50-100 meters,the coefficient of certainty is highest,suggesting an increased likelihood of landslides.Additionally,in the slope range of 10°-20°,the susceptibility of the evaluation unit to disaster is at its peak.In conclusion,this study identified the deformation characteristics of the

关 键 词：安全工程 输电线路杆塔 短基线集合成孔径雷达干涉测量 形变监测 确定性系数法 灾害易发性 

分 类 号：X43[环境科学与工程—灾害防治] P237[天文地球—摄影测量与遥感]