多车道高速公路的通行能力分析与建模

Capacity Analysis and Model Development of the Multilane Freeway

随着经济的快速发展,高速公路的客货运输需求迅速增加,越来越多的高速公路扩建为8车道或10车道的多车道高速公路,而中国目前还没有针对8车道及以上高速公路的通行能力展开充分研究.本文研究了整体式、客货分离式和"长途+集散"式3种断面形式下多车道高速公路通行能力的影响因素,构建了3种横断面形式下的多车道高速公路通行能力计算模型,并借助VISSIM仿真平台进行各断面形式下的交通流运行模拟,运用所得到的一系列速度—流量曲线,对模型中的相关参数进行标定.本文的研究思想与成果,可以从通行能力角度为新建和改扩建多车道高速公路断面布设与组织形式选择提供有效参考.

The demand of passenger and freight traffic has greatly increased in line with the rapid development of the economy and urban construction.Accordingly,a trend of broadening freeways from four or six lanes to multilane ones with eight,ten or even more lanes is increasingly obvious to balance the traffic supply with the traffic demand.However,studies are insufficient on capacity of multilane freeways in China at present.Therefore,computational models are proposed for capacity of multilane freeway in three cross section layout and organizational modes,which are integral,passenger-freight separated and‘long-distance artery ＆ collecting and distributing road’mode,respectively,according to particularly studied on the influence factors of capacity of multilane freeways.Calibration of related parameters in those models took place subsequently on the basis of different speed-flow curves which are obtained from simulations of traffic operation conducted by VISSIM simulation platform.When it comes to the modes selection of new building or reconstruction and extension of multilane freeways,the methods and results of this paper are suitable for being regarded as the references in capacity view.