斜坡上块石的起动流速与抛石体的稳定坡度

对松散结构河床中块石的稳定性进行三维分析。考虑了斜坡上的块石受与河床平行的重力分量影响．以及水动力与重力不共线两十特点．给出适应各种方向的起动流速普遍关系式。分析表明，起动流速以及斜坡稳定坡度决定于泥沙、床面性质和水流条件。流速方向不同．块石受力状况差别很大，这是斜坡和平底床面的主要差别。与试验数据对比说明，本文公式有相当的适应性。

Threshold velocity of quarry on a slope and stable slope of quarry mound

There are some differences between the forces acting on quarry on a slope and those acting on the horizontal bed, which are: 1 There is a gravity component parallel to river bed: 2 The direction of flow velocity changes; 3 Hydraulic forces and gravity are not generally located in the same plane, and not on the same line. From these points, a formula of threshold velocity of quarry on the slope is estabilished. Comparison shows a good agreement between the formula and practical data available.