桥墩紊流宽度的试验研究

由于我国现行的《内河通航标准》(GB50139-2004)中,没有桥墩紊流宽度的计算方法,桥梁设计人员为了保证船舶航行安全,通常将桥梁跨度加大,这样既增加了结构设计的难度,又增加了工程的投资。通过水槽定床和动床试验,分析了行近流速、行近水深、来流角度、桥墩尺寸、桥墩墩型、桥墩冲刷等因素对桥墩紊流宽度的影响,利用量纲分析法对实测数据进行整理,推导出了桥墩紊流宽度的计算公式。

Experimental Investigation on Turbulent Flow Width around Bridge Pier

For lack of method calculating turbulent flow width around bridge pier in the recent "Inland river navigation Standard"(GB50139-2004) of China,bridge designers usually increase the spans of bridge for navigation safety,which will increases both of structure design difficulty and project investment.So,it is extremely essential to do the research on turbulent flow width around bridge pier.Through fixed bed and mobile bed experiments in water tank,the factors such as approaching flow speed,approaching water depth,flow angle of incidence,sizes of bridge pier,shape of bridge pier,scouring around bridge pier etc.that influence the turbulent flow width around bridge pier are analyzed.Dimensional analysis method is used for data processing and the formula calculating the turbulent flow width around bridge pier is obtained.