基于舒适性的软土地区公路行驶质量评价方法

Evaluation Method of Driving Quality of Roads Constructed in Soft Soil Area Based on Driving Comfort

针对软土地基公路工后沉降大、分布范围广,现有国际平整度指数IRI评价方法存在很大局限性的问题,提出了基于行车舒适性的软土地区公路行驶质量评价方法.首先采用五自由度1/2车辆模型,计算比较了道路纵面线形拟合方法和数据间距对车辆振动加速度计算结果的影响,获得了车辆振动的加权加速度均方根值;根据ISO2631振动舒适性标准提出评价司乘人员的舒适性DCI和RQI计算公式及参数取值;结合软土地基及非软土地基两种路段沉降情况,比较了本文方法与国际平整度指数IRI方法评价结果的区别.分析发现,在非软土地基公路,本文方法与IRI方法评价结果接近;而在软土地基公路,两者的结果差异较大,本文方法更加符合工程师的直观感觉.

The post-construction settlement of road constructed on soft ground is significant and widespread.The current international roughness index(IRI)subjects some limitations.Hence,based on the driving comfortableness,this study proposed an assessment method for driving quality of roads on soft ground.Firstly,the influences of fitting methods and the distance of fitting points on the vehicle vibration acceleration were evaluated by five-degree 1/2 vehicle-road interaction model.The weighted root mean square of vehicle acceleration was thus obtained.Secondly,based upon the standard for vibration comfortableness(ISO2631),the equations for DCI and RQI for assessing the comfortableness of driver and passenger were developed.Finally,on the basis of two scenarios of soft ground and non-soft ground,the evaluation results calculated from the methods in this study and IRI were compared.The results demonstrate that,in the non-soft ground,the results are similar.In contrast,the results in soft ground are quite different,and the methods proposed in this study are more in line with the engineers′visual sense.