摘要
认为泥石流中固体颗粒更接近于层移运动的形式,可用泥沙层移质运动模型来描述泥石流运动.用轻质塑料沙进行试验,得到颗粒浓度沿深度的分布.按Bagnold关于颗粒碰撞产生离散力的概念,考虑Savage提出的修正,得到离散力的表达式.根据试验观察,认为近床面运动的颗粒中还存在附加阻力,提出其表达式.代入浓度分布以后得到颗粒速度的分布,与试验资料吻合,并与已有的泥石流试验资料和计算公式进行了比较和讨论.
Considering the motion of solid particles in debris flow in the form of layers, a laminated load model is presented for describing this fiow. The distributions of grain concentration are measured in experiments conducted with light materials. In this model, the despersive forces are expressed based on the conceptions suggested by R.A.Bagnold and its modification proposed by S.B.Savages. An additional shear stress is introduced for explaining the characteristics of grain collisions in the zone near the un-movable bed. According to the equilibrium of stresses in horizontal direction, the grain velocities are expressed in integral tion form and can be calculated by Simpson's method. The velocity distributions deduced by this model well agree with the data measured in our experiments as well as other investigations of debris flow.
出处
《泥沙研究》
CSCD
北大核心
1992年第3期21-29,共9页
Journal of Sediment Research
基金
国家自然科学基金