桥梁偏斜情况下河道水面线变化试验研究  

Experimental study of skew bridge's influence on water-surface curve

作　　者：宋丽[1] 鲁诗刊[1] 范皓然[1] 贺苗[1] 程敏[1] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004

出　　处：《广西水利水电》2011年第5期46-48,共3页Guangxi Water Resources & Hydropower Engineering

基　　金：国家大学生创新性实验计划项目(101059311)

摘　　要：针对桥梁的偏斜度、阻水比、单宽流量对河道水面线的影响,进行水工模型试验。通过对试验数据整理分析得出的主要结论是:单宽流量一定,最大壅水高度随偏斜度θ和阻水比λ的增大而增大,当0°≤θ≤30°、7%≤λ≤15%时,最大壅水高度随偏斜度和阻水比增大的幅度较大,当30°≤θ≤45°、15%≤λ≤20%时,最大壅水高度随偏斜度和阻水比增大的幅度较小;按常规的投影法计算斜交桥梁最大壅水高度值比试验值大5%-10%左右,且偏斜度越小,差值越大。Hydraulic model test had been conducted to study the influence of skew bridge data on water-surface curve such as skewness, block-water ratio and discharge per unit width. The results of test demonstrate that under constant unit-width discharge, the maximum back-water height rises with the increase of skew angle /9 and block-water ratio k; rises at higher gradient in case of 0°≤θ≤30°, 7% ≤λ≤ 15% and at lower gradient when 30°≤θ≤45°, 15%≤λ≤20%. The testing value is approximately 5%-10% less than that out of calculation by conventional projection conversion method, and their difference increases with dropping of skewness.

关 键 词：桥梁偏斜 模型试验 水面线变化 

分 类 号：TV131.6[水利工程—水力学及河流动力学]