曲率变化率在公路线形质量设计的应用研究

Evaluation of Highway Alignment Design Safety Based on Curvature Changing Rate of Curve

针对公路路线传统设计方法的不足以及用运行速度评价公路线形质量在主观性、可靠性、指标全面性以及适用性等方面存在的问题,引入了曲率变化率的概念.通过研究曲率变化率与交通事故的关系,提出了曲率变化率的安全评价标准及其在公路线形设计的应用流程.实例表明:曲率变化率值越大,弯道处发生交通事故次数越多,且在曲率变化率值CCRs>180 gon.km-1的弯道时,交通事故发生具有聚集性.

To solve the problem of the insufficiency in tradition design of alignment of highway as well as the ones in the aspects of subjectivity,reliability,target integrity and serviceability of quality assessment of highway＇s alignment,the concept of curvature changing rate of curve is put forward for the first time.Through researching the relation between curvature changing rate of curve and traffic accident,safety evaluation of curvature changing rate of curve and application in design for highway alignment are put forward.The example indicated： curvature changing rate of curve is a key indicator to weigh the curve place traffic;the curvature rate of change value is bigger,curve place has the traffic accident number of times to be more,and when CCRs180 gon·km^-1,occurrence of the traffic accident has the accumulation;curvature changing rate of curve in the highway alignment design to improving the highway alignment quality,increases the road security which have the significant practical significance.