%0 Journal Article
%T 两相泥石流运动过程中固体颗粒的分选
%A 王洋
%J 工程科学与技术
%D 2015
%X 中文摘要: 泥石流颗粒分选效应影响泥石流沿程侵蚀、运动距离、冲击力等运动和动力特性，对于泥石流的工程防治和危险性分析的研究具有重要意义。本文采用人工配制沙样，共进行了105组室内水槽实验，通过改变沟道物质组成、坡度及流量，研究泥石流颗粒物质分选规律。实验结果表明，泥石流龙头颗粒的分选性随砂粒含量、坡度、流量的上升，呈先上升后下降的趋势。为了综合考虑各因素的影响，定义分选比(R)为水流功(W)与泥沙颗粒水下重力(G＇)的函数。实验结果揭示出泥石流龙头颗粒物质的分选性随 上升，呈先上升后下降的趋势，最终建立并验证了描述泥石流龙头分选性的模型。</br>Abstract:Sediment sorting of debris flow affects the kinetic and dynamic characteristics such as erosion along the distance, movement distance and impact force. A better understanding of sediment sorting will improve research of control engineering and sensitivity division. 105 experiments were conducted to study the effect of material composition, flow and gradient on sediment sorting of debris flow head with artificial preparation of sand. The results showed that the sediment sorting increases firstly and decreases secondly as the increase of content of sand grain or gradient or flow. In order to consider the influence of each factor, sorting ratio (R) was defined as the function of stream power and underwater gravity of sediment. As increasing, sediment sorting of debris flow head increases firstly, decreases then. Finally, the model of sediments sorting of debris flow was established and validated.
%K 泥石流 龙头 分选 临界流量 水流功&lt
%K /br&gt
%K debris flow debris flow head sediment sorting material composition critical flow stream power
%U http://jsuese.ijournals.cn/jsuese_cn/ch/reader/view_abstract.aspx?file_no=201500941&flag=1