淤泥临界冲刷切应力研究

本文采用一个用有机玻璃制造的小型变坡水槽,对河口淤泥作了冲刷实验。淤泥中含有足够数量的淤泥颗粒。复杂的机理控制着这种泥沙的冲刷。 实验所得临界冲刷切应力的数值稍大于其他类似实验的结果。文中对实验的结果作了分析,并将各种实验方法作了初步比较。 对河口淤泥的水力实验采用可移动的实验装置十分有必要,这样可以使试样尽可能地保持它的原样。淤泥的临界切应力数值与淤泥试样的状况关系十分密切,当淤泥试样的密度增大时,它的临界冲刷切应力明显增大。

A Study for Critical Shear Stress on Mud Erosion

In this paper, a simple flume apparatus with bed slop adjusted was built. This experiment carried out on estuary mud, which contained a significant proportion of silt as well as clay. The erosion of the mud was studied as the bed shear stress was increased. Complex mechanisms govern the erosion process of such sediments containing a wide range of particle sizes.An estimate of the value of the critical shear stress was made and was found to be relatively high when compared with the results of other similar studies.A simple flume should be built. An important criterion in the design was that the flume should be portable, so that it could be taken into the field and tests could be carried out on samples in a state as undisturbed as possible.