摘要
位于青藏高原东部的金沙江上游大型深层滑坡极为发育,其蠕滑变形机制复杂、危害严重。采用短基线集合成孔径雷达干涉测量(SBAS-InSAR)技术,结合遥感解译、现场调查、工程地质钻探等手段,分析了四川巴塘贡伙村滑坡的发育分布特征与地表变形特征。研究认为,贡伙村滑坡在平面上包含滑坡后壁和滑坡堆积体2个区,滑坡长约2397 m、宽约2041 m,体积约4.7×10^(7)m^(3),钻探揭露2层埋深分别为40~45 m和47.80~48.85 m的滑带,并包含了6个次级滑坡,可能属于复合型的大型深层滑坡。InSAR形变监测表明,贡伙村滑坡的强变形区主要分布在L3次级滑体的中下部和L2次级滑体东侧冲沟处,L3次级滑体的最大形变速率为-112.66 mm/a,最大累积形变值达到124.4 cm;L2次级滑体的最大形变速率为-105.37 mm/a,最大累计形变量达126.3 cm。贡伙村滑坡变形模式总体为牵引式变形,自2014年11月至今,经历了匀速变形、加速变形和稳定变形3个阶段。综合分析认为,该复合型滑坡体的L3滑坡体未来的失稳滑动风险相对较高,须进一步加强监测预警。
Large-scale deep-seated landslides in the upper reaches of the Jinsha River,which is located in the eastern part of the Tibetan Plateau,are highly developed,with complex creeping deformation mechanisms and severe hazards.This study employs Small Baseline Interferometric Synthetic Aperture Radar(SBAS-InSAR)technology,combined with remote sensing interpretation,field investigation,engineering geological drilling,and other methods,to analyze the development,distribution characteristics,and surface deformation characteristicsof the Gonghuo Village Landslide in Batang County,Sichuan Province.Results indicate that the GonghuoVillage Landslide consists of two areas in plan view:the landslide backscar and the landslide accumulation mass.The landslide is approximately 2,397 m in length and 2,041 m in width,with a volume of approximately 4.7×10^(7)m^(3).Engineering drilling has revealed two sliding zones with burial depths of 40-45 m and 47.8-48.85 m respectively,and the landslide contains six secondary landslides,suggesting that it may be a largescale deep-seated composite landslide.InSAR deformation monitoring shows that the strong deformation zones of the Gonghuo Village Landslide are mainly distributed in the middle-lower portion of the L3 secondary landslide mass and the gully on the east side of the L2 secondary landslide mass.The maximum deformation rate of the L3 secondary landslide mass is-112.66 mm/a,with a maximum cumulative deformation of 124.4 cm;the maximum deformation rate of the L2 secondary landslide mass is-105.37 mm/a,with a maximum cumulative deformation of 126.3 cm.The overall deformation mode of the Gonghuo Village Landslide is traction-type deformation.From November 2014 to the present,it has experienced three stages:uniform deformation,accelerated deformation,and stable deformation.Comprehensive analysis suggests that the L3 secondary landslide mass of this composite landslide has a relatively high risk of instability and sliding in the future,and it is necessary to further strengthen monitoring and early warning.
作者
陈文凯
郭长宝
闫怡秋
刘贵
张伟杰
邱振东
袁新霞
CHEN Wenkai;GUO Changbao;YAN Yiqiu;LIU Gui;ZHANG Weijie;QIU Zhendong;YUAN Xinxia(Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory of Active Tectonics and Geological Safety,Ministry of Natural Resources,Beijing 100081,China;College of Earth Sciences and Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)
出处
《现代地质》
北大核心
2025年第6期1702-1715,共14页
Geoscience
基金
中国地质调查局地质调查项目(DD20221816)。
关键词
青藏高原东缘
金沙江
SBAS-InSAR
深层蠕滑型滑坡
贡伙村滑坡
Eastern margin of the Tibetan Plateau
Jinsha River
SBAS-InSAR
deep-seated creeping landslide
Gonghuo Village Landslide
