金沙江虎跳峡河段斜坡变形破坏特征及地质环境

文章在充分调研和综合分析研究金沙江虎跳峡河段岸坡地质背景的基础上,采用数理统计分析方法,对斜坡变形破坏体的主要类型、规模、数量、空间分布及与基本环境条件的关系进行了分析与总结。结果表明区内斜坡变形与破坏主要表现为斜坡变形体、滑坡体和崩塌体三种类型,并以大中型规模最为发育;其发生明显受地层岩性、河谷地貌、斜坡结构类型和地质构造等环境要素的控制,从而在河谷不同区段呈现出分布特征上的差异。

Characteristics of slope deformation-failure and geo-environment in the reaches of the Tiger-Leaping-Gorge of the Jinshajiang River

Along the Jinshajiang river,the landslides and landslips occur frequently and cause plenty of environment geologic problems to river construction.Based on engineering geological investigation and analysis of geologic background of the study area,the authors systematically analyzed and summarized the development status,space distribution and environment effects of deformed and failure mass with symbolic statistic method.The results show that slope deformed and failure mass mainly includes three types,such as slope deformed mass,landslide mass and landslip mass.The large-medium scale deformed and failure masses are the most active.The development distribution of deformed and failure masses is correlated with lithology,topographic change,bank-slope structural type and geological structure,which cause the difference distribution of deformed and failure masses in different sections of the reaches.