膨胀土边坡渗透变形的表面裂隙图像特征分析  

IMAGE CHARACTERISTICS ANALYSIS OF SURFACE CRACKS IN SEEPAGE DEFORMATION OF EXPANSIVE SOIL SLOPE

作　　者：李勇[1,2] 邱一迪[1,2] 高玮 高文伟[4] 崔芳鹏 胡瑞林 LI Yong;QIU Yidi;GAO Wei;GAO Wenwei;CUI Fangpeng;HU Ruilin(China University of Mining and Technology(Beijing),Beijing 100083,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China;Yan'an University,Yan'an 71600,China;China Earthquake Disaster Prevention Center,China Earthquake Administration,Beijing 100029,China)

机构地区：[1]中国矿业大学(北京),中国北京100083 [2]中国科学院地质与地球物理研究所,中国北京100029 [3]中国科学院大学,中国北京100049 [4]延安大学,中国延安716000 [5]中国地震灾害防御中心,中国地震局,中国北京100029

出　　处：《工程地质学报》2023年第1期267-276,共10页Journal of Engineering Geology

基　　金：国家重点研发计划项目(资助号:2019YFC1509902);国家自然科学基金面上项目(资助号:41977251)。

摘　　要：膨胀土在我国分布广泛。由于其具有涨缩特性,膨胀土边坡在干湿循环条件下易失稳形成滑坡,造成严重的地质灾害。裂隙的发育-扩展-贯通则是膨胀土边坡失稳致灾的前提,因此,准确把握裂隙的发育机制、图像特征,进而推演膨胀土滑坡的形成过程,是一条重要的预警途径。本文以安徽淠史杭灌区膨胀土边坡为研究对象,进行“降雨+自重”条件下的原位试验,对失稳过程中的土体表层裂隙图像特征进行系统研究,重点分析裂隙度、裂隙几何特征参数的变化与边坡失稳之间的关系。研究结果表明:通过土体表层裂隙图像的综合分析,进行边坡危险性评价,具有可行性;针对该地区膨胀土边坡,起始裂隙度处于0.19~0.03范围,后续裂隙度相较初始状态增加范围处于0.5%~1%,且沿软弱结构面存在的横向裂隙发育为主控裂隙时,边坡出现异常,应提出预警。It is an important way to accurately grasp the development mechanism and image characteristics of cracks and deduce the formation process of expansive landslide.In this paper,the expansive soil slope in Pishihang irrigation area of Anhui Province was taken as the research object.The in-situ test under the condition of rainfall plus dead weight was carried out to systematically study the image characteristics of soil surface cracks during the instability process.The emphasis was on the analysis of the relationship between the variation of crack degree,crack geometric characteristic parameters and slope instability.The results show that it is feasible to evaluate the slope risk through comprehensive analysis of soil surface crack images.In view of the expansive soil slope in this area,when the transverse cracks along the soft structural plane develop into the main control cracks,the slope would appear abnormal,and the early warning should be put forward.

关 键 词：淠史杭灌区 膨胀土 裂隙 图像分析 

分 类 号：TU413[建筑科学—岩土工程]