桥墩紊流宽度的试验研究

由于我国现行的《内河通航标准》(GB 50139-2004)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,因此,对桥墩紊流宽度的研究是十分必要的.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 Width of Turbulence Area around Bridge Pier

As the method for calculating the turbulent flow width around the bridge pier is not given in present "Inland river navigation Standard"(GB50139-2004) of our country,the bridge design personnel usually increases the bridge span in order to ensure navigation safety,which both increases the difficulty of structural design and increases the project investments.Therefore,it is extremely essential to research turbulent flow width around the bridge pier.Through the fixed bed and the mobile bed experiments,the factors influencing the turbulent flow width around the bridge pier are analyzed,such as approaching flow speed,water depth,the angle between bridge pier and flow direction,the sizes of bridge pier,the shapes of bridge pier,scouring around the bridge pier etc.By applying the dimension analytic method to the measured data,the formula for calculating the turbulent flow width around the bridge pier is derived.