水科学进展2011，Vol.22Issue(4)：509-515,7.DOI:32.1309.P.20110709.1619.002
渗流作用下床面切应力响应机理
On the response of bed shear stress to seepage
摘要
Abstract
Since traditional methods to measure bed shear stress fail to work in the presence of seepage, alternative approaches to study the response mechanism of bed shear stress to seepage are limited to some theatrical analyses with some assumptions and indirect estimation. The issues of whether seepage reduces or enhances bed shear stress are still matters of considerable debate. To this end, a special-designed device is deployed to directly measure the bed shear stress in the open channel flume with varying seepage rates. Experimental results show a close relationship between changes in bed shear stresses and the relative seepage intensity vB/U. Variation in bed shear stresses with seepage has an inflexion and a critical value when the \vR/U\ is about 0. 2% and between 0. 2% and 0. 4% , respectively. Therefore, it is clear that the range of va/U investigated experimentally is the leading cause of the contradiction in the literature.关键词
渗流/切应力/渗流强度Key words
injection/ suction/ seepage/ bed shear stress/ seepage intensity分类
建筑与水利引用本文复制引用
李寿千,陆彦,陆永军..渗流作用下床面切应力响应机理[J].水科学进展,2011,22(4):509-515,7.基金项目
国家自然科学基金资助项目 (50779037 （）
50879047) （）
