文章摘要
王军,李志颀,程铁杰,隋觉义.冰盖下桥墩局部冲刷随时间变化的试验研究[J].水利学报,2021,52(10):1174-1182
冰盖下桥墩局部冲刷随时间变化的试验研究
Time-dependent local scour around bridge piers under ice cover-an experimental study
投稿时间:2020-12-13  
DOI:10.13243/j.cnki.slxb.20201030
中文关键词: 冰盖  局部冲刷  时间变化  冲刷深度  试验研究
英文关键词: ice cover  local scour  time-dependent  scour depth  experimental study
基金项目:国家重点研发计划项目(2018YFC1508401);国家自然科学基金项目(51879065)
作者单位
王军 合肥工业大学 土木与水利工程学院, 安徽 合肥 230009 
李志颀 合肥工业大学 土木与水利工程学院, 安徽 合肥 230009 
程铁杰 合肥工业大学 土木与水利工程学院, 安徽 合肥 230009 
隋觉义 加拿大北英属哥伦比亚大学 环境工程系, 加拿大 乔治王子城 
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中文摘要:
      在寒冷地区,河道中冰盖的存在会改变河道流速分布。与明流条件相比,冰盖条件下水流最大流速点会向河床移动,加剧桥墩周围的局部冲刷。过度的局部冲刷会导致桥梁倒塌。基于水槽清水冲刷试验,对冰盖与明流条件下圆柱型桥墩局部冲刷随时间的变化进行了研究,试验结果表明:冰盖下桥墩局部冲刷速率大于明流。平衡冲刷深度比明流条件下的约大12%,且冲刷平衡所需时间比明流条件下的要约大10%。分析了水流强度与无量纲冲刷深度的关系以及冰盖与明流条件下冲刷深度变化速率的差异,给出了冰盖下局部冲刷深度随时间变化的经验方程,研究成果可供实际工程参考。
英文摘要:
      In cold regions, the presence of ice cover in a river changes the flow velocity distribution. The maximum flow velocity under an ice-covered flow condition is shifted closer to the channel bed,which can intensify the local scour process around bridge piers comparing to that under an open flow condition. Excessive scour around bridge piers may cause a collapse of bridges. In the present study,a series of clear-water experiments were carried out in flume to investigate the time-dependent local scour around a cylindrical pier under both ice-covered and open flow conditions. The results show that the local scour rate under ice-covered condition is faster than that under open flow condition. The equilibrium scour depth under ice-covered flow condition is 12% more than that under open flow condition. Also, the time needed for achieving an equilibrium state under ice-covered flow condition is 10% more than that under open flow condition. The relationship between the flow intensity and the dimensionless scour depth has been assessed, and the difference between scouring rates of two different cover conditions was studied. An empirical equation for calculating time-dependent local scour depth under ice-covered flow condition was developed. The results of this study can be used as reference for engineering practice.
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