水流作用下的淤泥起动流速试验研究

EXPERIMENTAL STUDY ON INCIPIENT OF MUD IN A FLUID

讨论河口、海岸淤泥的掀相起动机理。在分析中考虑淤泥以絮团形式起动,并从能量观点出发,以水流功率为指标,通过水槽试验得到了天津新港淤泥的掀相起动流速公式U_c^2=H^(1/3)[C_1D/r+C_21/rd(r_m-r_(m0))] 式中H为水深,D为絮团极限直径,d为颗粒直径,r及r_(m(?))为水及淤泥的容重,r_(m0)=1.20g/cm^3为淤泥的上限容重,C_1为絮团重力系数,C_2为粘结力系数。为便于生产实际的应用,给出了以淤泥容重为参数的起动流速与枉径的关系图,同时也解释和统一了以往不同作者结果间的差异。

This paper studies the mechanism of incipience of mud. In this analyses、from the viewpoint of energy the incipient motion is considered in the form of floc aggregate, the flow power being the criterion. Through flume experimentsU_c^2=H^(1/3)[C_1D/r + C_21/rd(r_m - r_(m0)]in which H is the depth of the water, D is the limiting diameter of floc aggregate, d is the diameter of the particle, r and r_mare the unit weights of water and mud, r_(m0)= 1.20g / cm^3 is the upper limit of mud, C_1 is the coefficient of floc aggregate gravity, C_2 is the coefficiant of cohesive force. From the point of practial application the relation between incipient velocity, diametar of particle, and unit weight is obtained, the formula of the incipient motion at Xing Gang mud can be abtained.