一种新型高速公路入口设计及其污染物减排效果分析

A new type of expressway entrance design and analysis of emissions reduction effect

针对传统双车道匝道入口设计存在的主要问题,提出一种新型双车道匝道入口设计方案,并运用Paramics Discovery 21.0软件进行交通仿真和AIRE软件进行机动车污染物排放量统计计算。结果表明,该方案通过内、外侧匝道合流点分离式设计,将匝道车辆与主线车辆的合流点分散,减小了匝道车辆对主线车辆的干扰。同时,该设计方案与传统方案相比,对于6车道高速公路,匝道交通量1000 veh/h情况下,机动车车均NOx、PM10及碳污染物排放量分别降低约12.1%、7.0%、10.9%;匝道交通量1250 veh/h情况下,3种污染物车均排放量分别平均降低约13.3%、6.2%、11.0%。同时,随主线和匝道交通量增大,新型分离式入口较传统直接式入口车辆的车均排放量降低量更大,即新型分离式入口设计更适用于主线交通量和匝道交通量均较大时的情况。另外,4车道和8车道2种高速公路中,匝道交通量1000veh/h情况下,4车道和8车道高速公路新型入口车均NOx排放量分别较传统入口平均降低约18.3%、10.5%,PM10排放量分别降低约9.0%、6.3%,碳污染物排放量分别降低约13.5%、10.2%,即新型分离式入口设计对4车道高速公路的减排效果更为明显。

This paper would like to propose a new entrance design scheme of a 2-lane ramp for the main problems of the traditional entrance.The presented entrance design scheme is aimed at reducing the interference of the ramp vehicle to the freeway by separating the entering points of the inner and outer ramp in hoping to trace and examine the energy saving and emission reduction effect of the given scheme,we have managed to adopt the Paramics Discovery 21.0 software for the traffic simulation and the AIRE software application for the statistical calculation of thevehicle pollutant emission,correspondingly.The testing results of the above scheme show that,for the 6-lane expressway,when the traffic volume of the ramp is 1000 veh/h,it would be possible for the vehicle emission of NOx,PM10 and the total carbon pollutants to be reduced by around 12.1%,7.0%and 10.9%,correspondingly,in comparison with the traditional one.And,in contrast,if the traffic volume is 1250 veh/h,the average emissions of the 3 kinds of pollutants can be expected to cut short by about 13.3%,6.2%,11.0%,correspondingly.What is more,with the increase of the traffic volume of the freeway and the ramp,it would be possible for the new entrance to reduce greater amount of vehicle emission than that of the traditional one.And,hence,the new entrance design we have suggested can be better fit for the emerging area with greater traffic volume of the freeway and the ramp.At the same time,for the 4-lane and 8-lane expressways,it can be expected for the vehicle emissions of NOx for the new entrance from the 4-lane and 8-lane expressways to cut short by about 18.3%and 10.5%,correspondingly,as compared with the traditional entrances when the traffic volume of the ramp is 1000 veh/h.Moreover,under the same conditions,the PM10 emissions can also be expected to get reduced by about9.0%and 6.3%,whereas the carbon pollutant emissions can be cut off by about 13.5%and 10.2%.Thus,it can be seen that the proposed innovated design of entrance of ours can be expected to bring about much greater advantageous benefits on the emission reduction of the 4-lane expressway.