基于SBAS-InSAR的金沙江上游探戈古滑坡变形特征与影响因素分析  

ANALYSIS OF DEFORMATION CHARACTERISTICS AND INFLUENCING FACTORS OF THE TANGE ANCIENT LANDSLIDE IN THE UPPER JINSHA RIVER BASED ON SBAS-INSAR METHOD

作　　者：张亚楠 郭长宝[1,3] 杨志华 吴瑞安[1,3] 闫怡秋 ZHANG Yanan;GUO Changbao;YANG Zhihua;WU Rui'an;YAN Yiqiu(Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;Key Laboratory of Active Tectonics and Geological Safety,Ministry of Natural Resources,Beijing 100081,China)

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]中国地质大学(武汉),工程学院,武汉430074 [3]自然资源部活动构造与地质安全重点实验室,北京100081

出　　处：《工程地质学报》2025年第1期186-200,共15页Journal of Engineering Geology

基　　金：中国地质调查局项目(资助号:DD20190319,DD20221816).

摘　　要：探戈古滑坡是位于青藏高原东南缘金沙江上游的一个特大型滑坡,该滑坡空间结构特征复杂、变形强烈,本文采用遥感解译、InSAR、无人机和野外调查等技术手段,对金沙江上游探戈古滑坡的变形特征和影响因素进行了分析研究。通过SBAS-InSAR技术,基于2016年1月至2022年2月144景Sentinel-1升轨数据,揭示探戈古滑坡变形明显,其雷达视线LOS方向最大形变速率为-87.2 mm·a^(-1),最大累积形变量达到590 mm;根据InSAR形变监测结果,将探戈古滑坡划分为4级变形区:极强变形区(V_(LOS)<-70 mm·a^(-1))、强变形区(-70 mm·a^(-1)≤V_(LOS)<-44.2 mm·a^(-1))、弱变形区`(-44.2 mm·a^(-1)≤V_(LOS)<-18.4 mm·a^(-1))和稳定区(V_(LOS)≥-18.4 mm·a^(-1)),调查发现探戈古滑坡中前部发育一强变形区,呈现高位蠕滑变形。野外调查发现,探戈古滑坡强变形区内发育陡坎、挡土墙变形、公路切坡导致的滑塌等地表变形现象,与SBAS-InSAR形变结果一致。探戈古滑坡变形受强降雨作用影响显著,为降雨因素作用下的推移式高位蠕滑变形模式,在时间上有较强的降雨滞后性,主要表现为静止-缓慢蠕滑-加速蠕滑等间歇性蠕滑特征。研究认为,探戈古滑坡在强降雨作用下容易失稳,形成滑坡-泥石流灾害链,具有堵塞金沙江的风险,建议进一步加强金沙江流域蠕滑变形滑坡的遥感调查、InSAR形变监测和风险防范研究。The Tange ancient landslide,located in the upper Jinsha River on the southeastern Tibetan Plateau,is a large landslide with complex spatial structure features and strong deformation.However,a comprehensive study on the developmental and deformation characteristics of the Tange ancient landslide is lacking.In this study,remote sensing interpretation,InSAR,UVA,and field survey techniques were employed to analyze and investigate the deformation characteristics and influencing factors of the Tange ancient landslide.By applying SBAS-InSAR method to the 144-view Sentinel-1 uplift data from January 2016 to February 2022.The maximum deformation rate reached-87.2 mm·a^(-1)in the line of sight(LOS)direction of the radar,with a cumulative deformation of up to 590 mm.Based on the InSAR deformation monitoring results,the deformation zone of the Tange ancient landslide was classified into four categories:very strong deformation zone(V_(LOS)<-70 mm·a^(-1)),strong deformation zone(-70 mm·a^(-1)≤V_(LOS)<-44.2 mm·a^(-1)),weak deformation zone(-44.2 mm·a^(-1)≤V_(LOS)<-18.4 mm·a^(-1)),and stable zone(V_(LOS)≥-18.4 mm·a^(-1)),a significant deformation zone was identified in the middle and front part of the Tange ancient landslide,exhibiting high creep deformation.Field surveys confirmed the deformation monitoring results of SBAS-InSAR,revealing surface deformation phenomena such as scraps,retaining wall deformation,and highway cutting slope in the strongly deformed area of the Tange ancient landslide.The deformation of the Tange ancient landslide is significantly influenced by heavy rainfall and exhibits a high-level creep deformation mode.The effect of heavy rainfall shows a lag in time,characterized by intermittent creep stages such as stationary creep,slow creep,and accelerated creep.The study concludes that the Tange ancient landslide is prone to destabilization under the influence of heavy rainfall,leading to a landslide-mudslide hazard chain with a potential risk of blocking the Jinsha River.It is recommended to en

关 键 词：青藏高原 SBAS-InSAR 探戈滑坡 强降雨 蠕滑变形 

分 类 号：P642.22[天文地球—工程地质学]