黄河滩岸稳定性影响因素的敏感性分析

黄河滩岸的崩塌失稳将会对滩地和村庄造成严重冲蚀,甚至造成堤防冲决,对黄河滩岸稳定性及其影响因素的敏感性进行分析具有重要的工程实践意义.选择了影响滩岸稳定性较大的主要因素(土体凝聚力c、坡体内水头H和坡角α)进行分析.由c、H及α变化组成不同分析工况,采用边坡稳定性分析方法,分析了滩岸稳定性,并在此基础上研究了滩岸稳定性对c、H及α的敏感性.分析结果表明:在各种计算工况下,黄河滩岸是稳定的;c是影响滩岸坡体稳定性最强的因素,其敏感性随坡角及水头的增大而增强;H对滩岸坡体稳定性影响次之,其敏感性随坡角的增大而增大,随凝聚力的增大而减小;α对坡体稳定的敏感性相对较小,其随凝聚力的增大而减小,随水头的变化不明显.

Sensitivity Analysis on Influencing Factors of Yellow River Beach Strand Stability

The instability of Yellow River beach strand will cause the erosion of beach land and villages, even embankment smash. Therefore, it has an important engineering practical significance to analyze the stability of Yellow River beach strand and the sensibility of its influencing factors. The main factors affecting the stability of beach strand are selected such as cohesion c, water head and H slope angle α. and the different analysis work condition is conducted with different combination of c, H and α. Using slope stability analysis method, the stability of beach strand is calculated, further the sensitivity of the beach strand stability to c, H and a and is researched. The resuhs show the beach strand of Yellow River is stable on these calculating engineering processes, and the c is the strongest affecting factor for beach strand stability, the βc,K increases with the increase of α or H; the H is the stronger affecting factor for beach strand stability,βH,K increases with the increase of α and with the decrease of c; but the α has relative a smaller effect on beach strand stability with βα,K decreasing when c increases, and with not obvious variation of βaK when H changes.