摘要
超高渐变段路面径流特征研究有助于从几何设计上改善路面排水。对采用线性过渡的超高渐变段,通过零纵坡轴的确定,推导路面等高线可用反比例函数xy=k表示,经Mathematica软件建模印证,路面径流曲线为等轴双曲线,具有以下特征,径流运行坡度持续变化,从高向低运动经历陡-缓-陡过程,与零坡轴相交处为最小坡度;超高渐变段路面径流必然出现折返现象,折返区域径流行程翻倍。路面径流与几何设计高度关联,路面宽度对径流折返面积的影响比纵坡、超高渐变率大。
The study on the pavement surface runoff characteristics of superelevation transition section is helpful to avoid the problem of poor pavement surface drainage through geometric design.For the superelevation transition section with linear transition,the zero longitudinal grade axis can be determined,and the pavement contour can be expressed by the inverse proportional function xy=k.The modeling by Mathematica software confirms that the pavement surface runoff curve is an equilateral hyperbola with the following characteristics:the runoff moves from high to low,resultant gradient changes all the time,and the minimum grade occurs at the intersection of zero grade axis.The road runoff in the ultra-high gradient section will inevitably experience a turning back phenomenon,and the runoff flow in the turning back area will double.Geometric design has a direct impact on pavement surface runoff,and the pavement width has a greater impact on runoff turn back area than profile grade and superelevation gradient.
作者
尚彦宇
孔繁星
SHANG Yanyu;KONG Fanxing(China Railway Eryuan Engineering Group Co.,Ltd,Chengdu 610031,China)
出处
《交通科技》
2023年第4期1-6,11,共7页
Transportation Science & Technology
关键词
超高渐变
路面径流
等轴双曲线
折返现象
superelevation
pavement surface runoff
equilateral hyperbola
turn back
