水利学报2017，Vol.48Issue(7)：791-798,8.DOI:10.13243/j.cnki.slxb.20160820
河床溯源冲刷影响下的桥墩冲刷
Pier scour under influence of headcut erosion of sand pit
摘要
Abstract
Considering the influence of retrogressive erosion on total scour at underwater structure,the study of scour evolution and prediction was conducted to provide a reference to the flood protection of structure.Based on the flume experiments,the evolution and influential factors of retrogressive and local scour were observed.In addition,a time-dependent calculation method was proposed for the coupling scour.The ratio of local scour with or without retrogressive erosion varies with the distance between the pier and sand pit in an up-convex shape curve,of which increase or decrease is related to the flow discharge and hydraulic drop at the pit.Furthermore,the contribution ratio of local scour and retrogressive scour to the total scour depend on distance between pier and sandpit,hydraulic drop and discharge.In a featured location,the rate of retrogressive erosion is instantly times larger than that of the local scour at pier.The coupling calculation method proposed in this paper is capable to predict the total scour depth at a pier including retrogressive erosion and local scour.关键词
墩柱耦合冲刷/采沙坑/跌水水头/溯源冲刷/局部冲刷Key words
pier coupling scour/sand pit/hydraulic drop/retrogressive scour/local scour分类
建筑与水利引用本文复制引用
齐梅兰,郐艳荣..河床溯源冲刷影响下的桥墩冲刷[J].水利学报,2017,48(7):791-798,8.基金项目
国家自然科学基金资助项目(51578062) （51578062）
中国铁路总公司科技研究开发计划资助项目(2014G009-H) （2014G009-H）
