粘性泥沙起动流速的探讨

本文结合琅琊山抽水蓄能电站下库库区原状土起动流速试验，对以往所采用的粘性泥沙起动流速分工进行了讨论。根据近年来明渠均匀紊流的理论研究与试验研究成果，对粘性泥沙的起动机理及起动流速的确定提出了一个设想，并给出了固结粘土的起动流速公式。本文指出，粘性泥沙的起动，除水流方面的影响外，粘性泥沙的组成及结构也是影响其起动的重要因素。因此，借鉴土力学、粘土坟物学等相关学科的研究成果将有助于此类工程问题的解决。

Study on Starting Velocity of Cohesive Sediment

In this paper, the formulas of starting velocity on cohesive sedimentation are discussed, combined with experiments of natural cohesive sedimentation in Lang ya Mountain Pumped Storage Power Station. Based on the research results of the theory and the test about turbulence in open channel, author proposes an assumption concerning the starting mechanism and starting velocity of cohesive sediment and gives a formula to determine the starting velocity of compact clay. The paper also points out that the fluctuating stress of flow is a main factor on the starting of sedimentation. And the component and the structure of cohesive sediment are also affecting factors to the starting. Consequently, by means of modern results of soil mechanics, clay mineralogy and fluid mechanics to investigate this kind of problem is avaiable for engineering. WT5HZ]