基于排水计算的多车道高速公路路拱研究
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摘要
针对高速公路改扩建工程中出现的多车道设计需求,结合国内相关改扩建项目,探讨了多车道高速公路路拱形式和横坡值,并通过计算坡面汇流历时以及设计积水宽度,从改善排水的角度对其进行研究。此外,还对临界路面横坡值、路面纵坡值的影响等因素进行了分析。结果表明:十车道高速公路可采用单幅单向路拱形式,采用2%横坡值时,一般情况下设计积水宽度小于硬路肩宽度,能够满足规范要求,但对于小纵坡的路段,须采取针对性措施。
Aim at the demand for multilane design in expressway reconstruction and extension, the road arch forms and transverse slope of multilane expressway are discussed by combining with the relevant practice of reconstruction and extension projects in China. Meanwhile, from the angle of improving the drainage, the road arch forms and transverse slope are researched through the calculation of the concentration time and the design of the width of water accumulation. In addition, the factors such as the critical cross section value of road surface and the influence of longitudinal slope value of pavement are also considered. The results show that single unidirectional arch form could be used for ten lane expressway. When the cross slope value is 2%, in general, specification requirements could be met when design water width is smaller than hard shoulder width. However, targeted measures should be taken for the section of small longitudinal slope.
Aim at the demand for multilane design in expressway reconstruction and extension, the road arch forms and transverse slope of multilane expressway are discussed by combining with the relevant practice of reconstruction and extension projects in China. Meanwhile, from the angle of improving the drainage, the road arch forms and transverse slope are researched through the calculation of the concentration time and the design of the width of water accumulation. In addition, the factors such as the critical cross section value of road surface and the influence of longitudinal slope value of pavement are also considered. The results show that single unidirectional arch form could be used for ten lane expressway. When the cross slope value is 2%, in general, specification requirements could be met when design water width is smaller than hard shoulder width. However, targeted measures should be taken for the section of small longitudinal slope.
引文
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[2] 周国红.多车道高速公路路基横断面的选择[J].北方交通,2016(6):132-134.
[3] 可加银,刘谦.双路拱变换车道安全性分析[J].交通科技,2016(6):150-152.
[4] 苏交科集团股份有限公司.沪武高速公路太仓至常州段扩建工程可行性研究报告[R].2018.
[5] 交通运输部公路科学研究所,苏交科集团股份有限公司.沪武高速公路太仓至常州段扩建工程多车道高速公路几何指标与设计参数体系研究[R].2018.
[6] 中华人民共和国交通运输部.公路路线设计规范:JTG D20—2017 [S].北京:人民交通出版社,2017.
[7] 中华人民共和国交通运输部.公路排水设计规范:JTG/T D33—2012 [S].北京:人民交通出版社,2013.
[8] 曲以波,王效华,王维泉.沥青路面表面排水特性及汇流历时研究[J].公路交通科技(应用技术版),2009,5(3):8-9,14.
[9] 计月华,曹建建.多车道高速公路路拱形式及超高设计方法分析[J].现代交通技术,2018,15(6):16-18,30.