摘要
由桥墩引起的局部河床冲刷一直是国内外学者关注的研究课题 ,因其因素复杂 ,研究大都采用了半理论半经验的方法 ,六十年代由铁道部科学研究院研究的桥墩局部冲刷公式就是采用了这种方法 ,公式中的经验系数包括墩型系数是借助大量的实验室实验资料和天然资料的分析得到的 ,该公式多年来对我国铁路与公路桥渡勘测设计起着重要作用。但近年来出现了新的大尺度墩形 ,需要研究其墩形局部冲刷系数。通过实验室实验对原公式中的墩形系数进行了扩充研究 ,填补了近年来跨江、跨海大跨度桥梁设计中发展的两种新型桥墩局部冲刷墩形系数。采用与原有墩形系数相同的实验方法和水沙实验条件 。
Local erosion in riverbed around bridge piers has been the focus of research in China and foreign countries. Due to its complexity, studies on it have been conducted in a semi empirical and semi theoretical way. The scour formulae developed by China Academy of Railway Sciences in the sixties used the same method. The empirical coefficients including the coefficient of pier type were obtained through analysis of a large amount of experimental data from the lab and fieldwork. The formulae have played a great role in the survey and design of railway and highway bridges. But new and larger bridge piers have been built in the past few years. Hence we should study the new local scour coefficients of bridge piers. The lab study on the pier type coefficients of the original formulae have been expanded, employing the same pier type coefficient for the test method and the same water and sand lab conditions. Therefore the new pie type coefficients are comparable with the original ones and of the same system.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2002年第3期99-103,共5页
China Railway Science
