基于InSAR形变的滑面摩擦残余估计与滑坡危险性评价  

FRICTION RESIDUAL ESTIMATION AND LANDSLIDE RISK ASSESSMENT BASED ON INSAR DEFORMATION

作　　者：蒋凯 杨莹辉 许强[1] 李林[1] 李鹏飞 黎浩良 陈强[3] JIANG Kai;YANG Yinghui;XU Qiang;LI Lin;LI Pengfei;LI Haoliang;CHEN Qiang(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;PowerChina,Guiyang Engineering Corporation Limited,Guiyang 550081,China;Department of Remote Sensing and Geoinformation Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),成都610059 [2]中国电建集团贵阳勘测设计研究院有限公司,贵阳550081 [3]西南交通大学,遥感与信息工程系,成都610031

出　　处：《工程地质学报》2024年第3期889-903,共15页Journal of Engineering Geology

基　　金：四川省哲学社会科学基金特别委托重大项目(资助号:SCJJ23WT06);新疆维吾尔自治区重点研发技术项目(资助号:2023B03011);地质灾害防治与地质环境保护国家重点实验室自主研究课题(资助号:SKLGP2021Z016);中国电建科技项目“高寒山区高位高危地质灾害早期识别及监测关键技术研究”(资助号:DJ-ZDXM-2020-03)。

摘　　要：传统滑坡灾害危险性评价往往依赖于坡表位移或形变速率等间接特征开展,但较少直接利用滑面自身的物理特征评估滑坡的危险性。在此,本文发展了一种依据滑面摩擦残余的斜坡危险性评价理论与方法,其基本流程为:首先利用InSAR技术提取滑坡时序变形数据,其次在坡表形变的约束下反演获得斜坡沿滑面的滑移时空演化特征;进一步依据速度摩擦衰减定律计算获得坡体的摩擦系数残余及稳定摩擦系数,并据此分析滑面稳定摩擦系数的时空变化,进而定量评估滑坡的危险性。本文选取西藏山南市隆子县庞村滑坡作为研究对象,利用发展理论与方法获得庞村滑坡的多期滑面稳定摩擦系数,结果显示滑面稳定摩擦系数虽然会随季节出现一定的周期性波动,但总体上呈现显著的下降趋势,并由滑坡后缘向滑坡前缘发展,同时初步推测在滑面稳定摩擦系数小于0.4时,滑坡可能会进入临滑失稳状态。本文提出的利用InSAR形变的滑面摩擦残余与滑坡危险性评价方法,可相对便捷、迅速地实现对滑坡状态的定量评价,且成本较低,可为广域滑坡灾害的监测预警及风险性评估提供有意义的科学参考。Traditional landslide hazard assessments often rely on indirect characteristics,such as slope surface displacement or deformation rate,but seldom directly utilize the physical properties of the sliding surface itself to assess the risk of landslides.In this paper,a slope hazard assessment theory and method based on the residual friction of the sliding surface are developed.The basic process is as follows:Firstly,InSAR technology is used to extract the time series deformation data of the landslide.Secondly,the spatial and temporal evolution characteristics of the slope along the sliding surface are obtained by inversion under the constraint of slope surface deformation.Further,the residual friction coefficient and stable friction coefficient of the slope are calculated according to the law of velocity friction attenuation.The temporal and spatial variation of the stable friction coefficient of the sliding surface is analyzed,and then the risk of landslides is quantitatively evaluated.This paper selects the Pangcun Landslide in Longzi County,Shannan City,Xizang,as the research object and applies the proposed theory and method to obtain the stable friction coefficient of the multi-stage sliding surface of the Pangcun Landslide.The results show that although the stable friction coefficient of the sliding surface will fluctuate periodically with the season,it generally shows a significant downward trend,developing from the trailing edge of the landslide to the leading edge of the landslide.At the same time,it is preliminarily speculated that when the stable friction coefficient of the sliding surface is less than 0.4,the landslide may enter a critical sliding instability state.The method of friction residual and landslide risk assessment using InSAR deformation proposed in this paper can realize a relatively convenient and quick quantitative evaluation of the landslide state.It has a relatively low cost and can provide a meaningful scientific reference for monitoring,early warning,and risk assessment of wide-area land

关 键 词：滑坡灾害 InSAR形变 滑移分布 摩擦残余 危险性评价 

分 类 号：P642.22[天文地球—工程地质学]