时序InSAR边坡滑移监测下输电杆塔失稳机理研究  

Research on Instability Mechanism of Transmission Towers under Time-series InSAR Slope Slip Monitoring

作　　者：高霞霞 李素敏[1] 陈朋弟 袁利伟[1] 黄然 GAO Xiaxia;LI Sumin;CHEN Pengdi;YUAN Liwei;HUANG Ran(School of Land and Resources Engineering,Kunming University of Science and Technology,Kunming 650093 China;Yunnan Power Grid Co.,Ltd.Electric Power Research Institute,Kunming 650217,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]云南电网有限责任公司电力科学研究院,云南昆明650217

出　　处：《贵州大学学报（自然科学版）》2022年第1期43-50,共8页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金资助项目(41161062,41861054);云南省重点研发计划资助项目(202003AC100002)。

摘　　要：滑坡等地质灾害容易引起输电线路杆塔塔基变形,从而影响电力系统的安全运行。针对边坡滑移引起的输电线路杆塔塔基失稳问题,本文利用小基线集合成孔径雷达干涉测量SBAS-InSAR技术对获取的2019年1月—2020年12月覆盖研究区的Sentinel-1A降轨数据进行处理。首先,识别潜在滑坡点;其次,结合实测数据及现场调查对该区域的输电杆塔做进一步的稳定性评估;最后,通过时空演变特征分析输电杆塔塔基的失稳机理。结果表明:N号输电杆塔附近的滑坡是导致该塔基失稳的主要原因,而滑坡的发生受内外因素的制约,内因方面主要受软弱岩性的影响,外因方面主要受降雨量、重型货车碾压的影响,在内外因的共同作用下,坡体抗剪强度降低、沉降速率加快。研究结果揭示了SBAS-InSAR技术在输电杆塔塔基失稳性监测中的可靠性与实用性,通过对滑坡发育规律及塔基失稳机理的研究,可为电力等相关部门在输电线路选址、巡检等早期隐患识别方面提供有效的参考依据,具有重要的应用价值。Geological disasters such as landslides can easily cause the deformation of the tower foundations of transmission lines, thereby affecting the safe operation of the power system. Aiming at the instability of transmission line tower foundation caused by slope slippage, this paper uses SBAS-InSAR technology to process the Sentinel-1A deorbit data obtained from January 2019 to December 2020 covering the study area. First, potential landslide points are identified. Secondly, the measured data and onsite investigations are combined to further evaluate the stability of the transmission towers in the area, and finally the instability mechanism of the transmission tower foundations through the characteristics of time and space evolution are analyzed. The results show that the landslide nears the transmission tower N is the main cause of the instability of the tower foundation, and the occurrence of the landslide is restricted by internal and external factors. The internal factors are mainly affected by weak lithology, and the external factors are mainly affected by rainfall and heavy trucks. Under the influence of pressure, the shear strength of the slope decreases and the settlement rate accelerates due to the combined action of internal and external factors. The research results reveal the reliability and practicability of the SBAS-InSAR technology in the monitoring of the instability of the tower foundation of the transmission tower. Through the study of the landslide development law and the mechanism of the tower foundation instability, it can be used for power and other related departments in the selection of power transmission lines. It provides an effective reference basis of early hidden danger identification such as patrol inspection, and has important application value.

关 键 词：输电杆塔 滑坡 SBAS-InSAR 时空演化 隐患识别 

分 类 号：P694[天文地球—地质学]