清江流域滑坡发育地质环境特征的统计分析  

Statistical analysis of the geological environment characteristics of landslide development in Qingjiang River Basin

作　　者：谭建民[1] 常宏[1] 韩会卿[1] 章昱[1] TAN Jian-Min;CHANG Hong;HAN Hui-Qing;ZHANG Yu(Wuhan Centre of China Geological Survey,Wuhan 430205)

机构地区：[1]中国地质调查局武汉地质调查中心,武汉430205

出　　处：《华南地质与矿产》2018年第4期315-322,共8页Geology and Mineral Resources of South China

基　　金：中国地质调查局国土资源大调查项目"三峡地区万州-宜昌段交通走廊1:5万环境地质调查"(121201009000161315)资助

摘　　要：地质环境决定了滑坡的空间发育。本文立足于2002年大调查以来的清江流域滑坡灾害统计,研究了滑坡的发育与地貌和岩性等地质环境的的关系。统计结果表明,斜坡坡度及岩层倾角与滑坡关系密切,滑坡主要发育在坡度10°～50°范围内,岩层倾角10°～40°范围内;地层时代的影响表现为滑坡主要发生在三叠系地层,其次为二叠系和志留系,其余面积很小;岩性中碳酸盐岩岩组所形成的滑坡占70%以上,松散岩类和碎屑岩类的岩组所形成的滑坡较少。这些结论对于人们认识滑坡空间分布、进行群测群防有指导意义。Geological environment determines the spatial development of landslide. Based on the statistics of landslide disasters in Qingjiang river basin since the 2002 big survey, this paper studies the relationship between the development of landslide and geological environment such as geomorphology and lithologic age. The statistical results show that the slope of the reservoir bank and the dip angle of the rock stratum are closely related to the landslide which mainly develops in the range of 10°~ 50° of slope and 10°~ 40° of dip angle. The influence of strata age shows that landslide mainly occurs in Triassic strata, followed by Permian and Sllurian strata, and the rest area is very small. In lithology, over 70 % of the landslides are formed by carbonate rock formations, while fewer landslides are formed by loose rock and clastic rock formations. These conclusions have guiding significance for people to understand the spatial distribution of landslides and to carry out group monitoring and prevention.

关 键 词：清江流域 地质环境 易滑地层 发育规律 滑坡 

分 类 号：P642.22[天文地球—工程地质学]