摘要
采用人工配制沙样,共进行了105组室内水槽试验,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。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;试验结果揭示出泥石流龙头颗粒物质的分选性随W0.5/G'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。
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 with the increase of the 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. With the increase of W0. 5/ G＇,the sediment sorting of debris flow head increases firstly,decreases then. Finally,the model of sediments sorting of debris flow was established and validated.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2015年第6期61-68,共8页
Journal of Sichuan University (Engineering Science Edition)
基金
中国科学院重点部署项目资助(KZZD-EW-05-01)
中国科学院国际合作局对外合作重点项目资助(131551KYSB20130003)
关键词
两相泥石流
龙头
分选
临界流量
水流功
two-phase debris flow
debris flow head
sediment sorting
material composition
critical flow
stream power
