道路交通荷载横向分布特性分析

在中国不同省份收集了20个道路断面的计重收费数据,并在25条道路上进行现场交通摄像与数据读取,分析道路的方向分布系数、车道分布系数及其影响因素.结果表明,方向分布系数一般为50%～60%,而重交通方向当量轴载作用次数在总作用次数中所占的比例为50%～85%.当两个方向交通荷载特性存在明显区别时,应对两个方向的路面结构分别进行设计.交通行驶方式对车道分布系数有明显的影响.对于双向两车道道路,高速公路的车道分布系数较大;而对于双向三车道道路,非高速公路的车道分布系数较大.分别对高速公路和其他公路提出了车道分布系数的推荐值,供路面结构分析和设计之用.

Analysis of the Transverse Distribution of Traffic Loading on Highways

Traffic loading data were collected from 20 toll stations,and 25 highways were videotaped to obtain relevant traffic information in various provinces in China.Directional distribution factor(DDF),lane distribution factor(LDF) and their influential causes were analyzed.The results have shown that DDF is typically within 50%~60%,while the number of equivalent single axle load(ESAL) in heavy traffic direction is within 50%~85% of the total ESAL.Therefore,pavements should be designed for two traffic directions separately if the traffic characteristics in the two directions exhibit significant difference.Traffic configuration has great impact on LDF.LDF of expressway is larger than that of other highways for two-lane traffic,while LDF of other highways is larger for three-lane traffic.Typical values of LDF are recommended for expressways and other highways,which can be used in pavement analysis and design.