粘性土及粘性土夹沙的起动规律研究

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.

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

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.