水利水电科技进展2012，Vol.32Issue(6)：70-74,5.DOI:10.3880/j.issn.1006-7647.2012.06.018
一种塑料模型沙运动特性试验
Experiment of motion characteristics of a kind of plastic model sediment
摘要
Abstract
An experimental study was performed on the submarine repose angle, group settling velocity, and incipient velocity of a kind of compound plastic model sediment. The submarine repose angle can be determined from the geometric relationship of the cone formed by the model sediment accumulating naturally in static water. The sediment sample was divided into different groups according to diameter to perform the single particle settling experiment. Then, the arithmetic average settling velocity of each group was calculated and the group settling velocity was obtained with the weighted average of all groups. The incipient velocities under five kinds of water depth were measured in a glass flume and were verified by experienced formulas. Experimental results show that the submarine repose angle was 28. 4 larger than the value of traditional plastic sediment, which manifests outstanding underwater shaping ability; the W. W. Rubbey formula is acceptable for calculating single particle settling velocity, but it is not accurate enough to calculate the group settling velocity using formulas with the median particle diameter, meaning that the proper representative diameter needs further research; the incipient velocities measured are larger than the traditionally used ones, corresponding to the submarine repose angle experiment; and Shamov' s formula can properly formulate the states of individual initiation and a small amount initiation by adjusting the coefficient K, while it is not accurate enough for the state of a large amount of initiation.关键词
塑料模型沙/水下休止角/群体沉速/起动流速Key words
plastic model sediment/submarine repose angle/group settling velocity/incipient velocity分类
建筑与水利引用本文复制引用
唐立模,刘全帅,韩柯尧,肖洋..一种塑料模型沙运动特性试验[J].水利水电科技进展,2012,32(6):70-74,5.基金项目
国家自然科学基金青年科学基金(50909036) （50909036）
河海大学水文水资源及水利工程科学国家重点实验室基本科研业务费自主研究项目(2011585712,2010585512) （2011585712,2010585512）
水利部公益性行业科研专项(200901005) （200901005）
