| 等效粒径与非均匀沙起动条件研究 |
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| 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):21-22. |
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| 作者姓名： | 何文社 雷孝章 刘兴年 曹叔尤 |
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| 作者单位： | 四川大学高速水力学国家重点实验室,成都,610065 |
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| 基金项目： | 国家自然科学基金，水利部联合资助重大项目(59890200)，九五课题(95-5-4)资助 |
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| 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。
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| 关 键 词： | 等效粒径 非均匀沙 泥沙起动 泥沙运动 工程水力学 水流流速 受力分析 临界希尔兹数 |
| 修稿时间： | 2002年8月29日 |
EQUIVALENT GRAIN WITH INCIPIENT MOTION OF NON-UNIFORM SEDIMENT |
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| HE Wenshe LEI Xiaozhang LIU Xingnian CAO Shuyou.EQUIVALENT GRAIN WITH INCIPIENT MOTION OF NON-UNIFORM SEDIMENT[J].Mechanics and Engineering,2003,25(6):21-22. |
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| Authors: | HE Wenshe LEI Xiaozhang LIU Xingnian CAO Shuyou |
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| Abstract: | The formula for calculating the incipient motion condition of non-uniform sediment has been established by considering the equivalent grain and the relative exposure degree. The results show that the coefficient of the formula is not a constant but varies in a range with the diameter, relative exposure degree and incipient status of grain. The formula for uniform sediment has also been obtained, with the coefficient in a range. The domain of coefficient value calculated in the formula has been verified by using other coefficient data. The results show that the equivalent grain can reflect the characteristics of the sediment incipient motion. |
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| Keywords: | non-uniform sediment incipient motion of sediment equivalent grain |
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