摘要
在现行公路路线设计规范中,连续纵坡坡长的相关规定主要适用于长大纵坡的情况,规范中没有明确规定对于较短距离内的连续纵坡坡长控制规定。实际工程经验表明,较短距离的连续上坡坡长控制不当会给道路安全、通行效率带来不良影响。基于上坡坡长控制原理分析,提出适用短距离连续上坡的合理坡长判定原则,即经过连续上坡货车的最终速度不低于容许最低速度;提供连续上坡情况下货车运行速度的获取方法和纵断面坡长设计优化方法,以实现短距离连续上坡坡长判定和设计参数确定。同时,以某越江高速公路的纵断面方案设计为例,说明所提方法的合理性。所研究的方法以定量形式界定连续上坡坡长是否过长,并为方案检验和设计比选提供依据,具有较好的应用推广价值。
In the current highway route design specifications,the relevant provisions on the length of continuous longitudinal slope are mainly applicable to the case of large&long longitudinal slope,but there is no clear regulation on the control of the length of continuous longitudinal slope within a short distance.The practical engineering experience shows that the improper control of the length of the short distance continuous uphill will bring adverse effects on road safety&traffic efficiency.Based on the analysis of the principle of uphill length control,a reasonable slope length determination principle suitable for short-distance continuous uphill is proposed,that is,the final speed of the truck passing through the continuous uphill shall not be lower than the allowable minimum speed;the acquisition method of the running speed of the freight car and the optimization method of the longitudinal section slope length design are provided to realize the determination of the slope length and the determination of the design parameters for the short-distance continuous uphill.At the same time,the rationality of the proposed method is illustrated by taking the longitudinal section design of some river crossing expressway as an example.The method studied in this paper defines whether the length of continuous upward slope is too long in quantitative form,and provides the basis for scheme inspection&design comparison,which has good application value.
作者
解雯静
虞振清
XIE Wen-jing;YU Zhen-qing(Shanghai Urban Construction Design&Research InstituteCo.,Ltd.,Shanghai 200125,China)
出处
《中国市政工程》
2020年第6期76-79,115,共5页
China Municipal Engineering
关键词
连续上坡
货车爬坡
运行速度
坡长
continuous uphill
truck climbing
running speed
slope length