摘要
受采砂等人类活动影响,高明大桥附近河床下切幅度达10 m,威胁到大桥安全与稳定。该文在分析桥墩附近河床冲刷现状及床沙特性的基础上,通过建立桥址附近河道平面二维水流数学模型,结合经验公式进行桥墩局部冲刷水力计算,预测桥墩局部冲刷坑范围和趋势,据此提出桥墩抛石防护方案,包括防护范围、块石粒径、抛石厚度等。经汛后检测,冲刷防护措施效果较好,可为珠江三角洲类似大桥冲刷防护工程应用提供参考。
Influenced by sand excavation, riverbed beside Gaoming Bridge deepened 10m, which affecting the bridge safety. Through analyzing the present condition of the river bed scour and sediment characteristic, local scour around bridge piers have been predicted through building a two-dimensional flow model, and combining with the theoretical calculation. Underwater riprap protection scheme including protected range, thickness of ripped-stone layer, have been proposed based on the calculation results. There is good protection effect through practice after seasonal flood, and the research work could give reference for similar protection of bridge projects in Pearl River Delta.
作者
李海彬
黄东
何书琴
李虎成
徐林春
LI Haibin HUANG Dong HE Shuqin LI Hucheng XU Linchun(Guangdong Research Institute of Water Resources and Hydropower, Guangdong Engineering Laboratory of Estuary Hydropower, Guangzhou 510635, China)
出处
《广东水利水电》
2017年第8期9-12,共4页
Guangdong Water Resources and Hydropower
基金
广东省水利科技创新项目(编号:2015709)
广东省交通运输厅科技项目(编号:科技-201702015)
国家重点研发计划项目(编号:2016YFC0402606)
关键词
高明大桥
桥墩冲刷防护
水力数值模拟
局部冲刷
抛石
Gaoming bridge
bridge pier scour protection
numerical hydraulic modeling
local scour
riprap