粘性土及粘性土夹沙的起动规律研究

Incipient Motion Law of Cohesive Soil and the Mixture of Cohesive Sediment and Coarse Particle

  • 摘要: 从水流脉动的机理出发,以粘性土的宾汉应力作参数,建立了粘性土的临界起动剪切力公式.根据一系列实验结果,分析了不同情况下粘性土夹沙的起动条件,归纳出统一的表达式.此外,还对上部水流为浑水的情况下,粘性土及粘性土夹沙的起动条件作了定性分析.

     

    Abstract: The incipient motion of cohesive sediment and the mixture of cohesive sediment and coarse particle are researched systematically. On the basis of turbulent flow theory, a formula for determining the critical shear stress of cohesive sediment with the Bingham stress of cohesive sedi ment is ascertained. According to a series of experiments, the conditions of incipient motion for the mixture of cohesive sediment and coarse particle in different cases are discussed and formalized. The result of all above-mentioned formulae are in agreement with experiment data. In addition, a qualitative analysis about the conditions of incipient motion of cohesive sediment and the mixture of cohesive sediment, and coarse particles above which dense flow exista are carried out.

     

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