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基于公路三维线形几何特性的行车安全分析

, PP. 24-29

Keywords: 道路工程,行车安全,三维线形,曲率,挠率,突变,几何连续性

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Abstract:

?为了明确传统公路平、纵线形分离设计思想存在的不足及对行车安全的影响,从公路三维线形本质出发,采用空间曲率和挠率对现有线形几何特性进行描述,建立了基于二维设计要素的公路三维线形描述模型;利用SPSS分别建立了高速公路和双车道公路相邻路段平均曲率差、挠率差与事故率之间的关系模型。研究结果表明:公路线形设计时平纵线形的叠加并不能保证组合线形在三维空间中的连续性,当二维线形要素变化时,组合线形的连续性会存在不同程度衰减;空间曲率和挠率的突变量大小与行车安全强相关,其中曲率的连续对行车安全起主导作用,公路真三维线形设计应至少保证二阶几何连续。

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