松散堆积体水下稳定坡角与粒度成分的关系

Relationship between underwater stable slope angle and granularity composition of loose deposits

结合西南某龙头水库工程,在查明库区岸坡不同成因、不同粒度成分的坡体结构基础上,对水库运行中不同松散堆积体边坡的水下稳定坡角进行实测,并在相应部位进行粒度分析,采用分形理论得出不同堆积体粒度成分的综合表征值,统计了细粒质量分数,利用该综合表征值以及细粒质量分数,建立不同松散堆积体粒度成分与水下稳定坡角之间的2个相关关系表达式。基于这2个表达式,只需测定库区各种不同松散堆积体粒度成分即可确定其相应的水下稳定坡角,从而进行坍岸范围预测。

Combined with a main reservoir project in southwest China and based on investigating the slope structure of different causes and granularity composition,the underwater stable angles of slopes with different loose deposits during the medium-term of reservoir operation were measured,and the granularity composition at corresponding site was analyzed.The comprehensive characteristic values of different deposits were obtained by using the fractal theory,and the content of fine particles was calculated.On such a basis,two expressions for the relationship between the granularity composition and the underwater stable angle were established.Accordingly,as for different loose deposits in reservoirs,only the granularity composition was measured for the corresponding underwater stable slope angle so as to predicate the range of bank collapse.