河道水位降落对边坡稳定的影响  

Stability of river bank subject to drawdown of water level

作　　者：陆彦[1] 陆永军[1] 张幸农[1] 

机构地区：[1]南京水利科学研究院,江苏南京210029

出　　处：《水科学进展》2008年第3期389-393,共5页Advances in Water Science

基　　金：国家自然科学基金资助项目(50779037);江苏省博士后科研资助项目;南京水利科学研究院院基金资助项目~~

摘　　要：利用水槽试验和理论分析相结合,研究河道水位降落时岸坡渗流对边坡稳定的影响。考虑渗透力作用,分析岸坡上泥沙颗粒的受力特点,推导出临界稳定坡度与渗流水力梯度的关系。在渗流为向上和向下指向时这一关系和水槽试验数据吻合很好。测量结果表明,向上的渗流使得临界稳定坡度减小,而向下的渗流作用相反。另外,渗流对岸坡稳定的影响大小和渗流方向密切相关。给出了岸坡临界稳定坡度取值最小时的渗流方向。The stability of a river bank slope is studied experimentally and theoretically in the presence of seepage due to the drawdown of water level in this paper. Including seepage in a 3-dimensional theoretical analysis, the study first shows how the critical slope or angle of repose of sediment is related to the hydraulic gradient of seepage. The measured laboratory data reasonably fit well with the theoretical relationship in the case of injection and suction. The data reveal that the slope is reduced and increased with injection and suction, respectively. Additionally, the critical stable slope is shown to be related to both the hydraulic gradient and the seepage direction. The study identifies the seepage direction which results in a minimum critical stable slope for a certain hydraulic gradient of seepage.

关 键 词：渗流 岸坡稳定 河道水位降落 临界稳定坡度 

分 类 号：TV139.1[水利工程—水力学及河流动力学]