引用本文: 何文社, 雷孝章, 刘兴年, 曹叔尤. 等效粒径与非均匀沙起动条件研究[J]. 力学与实践, 2003, 25(6).
EQUIVALENT GRAIN WITH INCIPIENT MOTION OF NON-UNIFORM SEDIMENT[J]. MECHANICS IN ENGINEERING, 2003, 25(6).
 Citation: EQUIVALENT GRAIN WITH INCIPIENT MOTION OF NON-UNIFORM SEDIMENT[J]. MECHANICS IN ENGINEERING, 2003, 25(6).

## EQUIVALENT GRAIN WITH INCIPIENT MOTION OF NON-UNIFORM SEDIMENT

• 摘要: 阐述了泥沙起动机理，通过对等效粒径概念及表达式的引入，推得了泥沙起动公式.该公式的系数并非一个常量，而是位于某个区间，且随泥沙粒径、相对暴露度及起动标准而变. 同时得到了均匀沙的起动公式，该公式系数同样位于一个区间. 通过与部分均匀沙公式的系数比较可知，所给出的系数的取值区间基本涵盖了其他公式系数. 说明采用等效粒径能反映泥沙的起动特性.

Abstract: The formula for calculating the incipient motioncondition of non-uniform sediment has been established by consideringthe equivalent grain and the relative exposure degree. The results showthat the coefficient of the formula is not a constant butvaries in a range with the diameter, relative exposure degree and incipientstatus of grain. The formula for uniform sediment has also beenobtained, with the coefficient in a range. The domain of coefficient valuecalculated in the formula has been verified by using other coefficientdata. The results show that the equivalent grain can reflect thecharacteristics of the sediment incipient motion.

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