轻质沙的起动流速

Velocity of Incipient Motion for Particles of Light Matirial

本文通过试验,研究了塑料沙和电木粉两种轻质沙的起动流速,提出了轻质沙的起动流速公式,揭示了d<0.038mm电木粉细颗粒在水下发生的固结现象,明确了起动流速随固结时间的变化规律。

Incipient motion velocity of two kinds of light material particles, ba-kelite and polystyrene were studied by experiment. The Equation of incipient motion for particles of light material was obtained from experimental data as follows.Cohesive phenomenan of fine bakelite particles with D50<0. 038mm has been founded. It is increasing gradually with time elapsing, velocity of incipient motion is increasing with cohesive force. The relationship between velocity of incipient motion and time duration was obtained from experimental data as follows,Vct=VcT1/8 ( 3)Equation (3) can only be used for bakelite with certain size distribution and consolidation in 60 days. The cohesion of bakelite of fine particles, attention should be paid. It is important for scouring similarity in sediment model experiment.