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本文对非均匀沙起动机理作了分析，提出适合非均匀沙分级起动的判别标准．运用概率论与力学结合的方法，对起动颗粒的作用力臂进行随机分析，导出考虑非均匀沙隐暴效应的起动概率表达式，藉此建立非均匀沙第ｋ粒级的起动公式．在水槽中对天然沙加颜色沙进行分级起动试验，据以确定隐暴系数，从而获得与均匀沙兼容的起动切应力和起动流速公式．
This paper analyzes the mechanism of non-uniform sand start-up, and puts forward the criterion of non-uniform sand start-up. Using the combination of probability theory and mechanics, the force arm of the starting particle is analyzed stochastically, and the starting probability expression considering the non-uniform sand creep effect is deduced to establish the k-th particle start formula. In the water tank, the grading start test of natural sand and color sand is carried out to determine the caustic coefficient so as to obtain the formula of starting shear stress and starting flow rate compatible with uniform sand.