高速公路改扩建施工区通行能力研究

Research on the capacity of reconstruction and extension of expressway work zone

运用实测数据和仿真实验的方法,分析高速公路改扩建施工区流量、速度、车头时距等参数特性。基于实测速度-流量数据,建立速度-流量回归模型。研究发现,发生交通中断前后施工区通行能力会发生显著变化:2-1施工区(单向2车道,关闭-车道)交通中断前后通过流率下降百分比为8.56%,3-1施工区(单向3车道关闭2车道,开放1车道通行)交通中断前后通过流率下降百分比为10.56%,3-2施工区(单向3车道关闭1车道,开放2车道通行)交通中断前后通过流率下降百分比为9.75%;量化大型车比例、车道关闭形式、限速、中间带开口长度对通行能力的影响,确定大型车比例对通行能力的修正系数,给出不同车道关闭形式及不同限速、不同中间带开口长度下的通行能力推荐值。研究结果可为施工区的交通组织提供理论支撑。

Based on the measured data and simulation experiment,this paper analyzes the parameters of the flow,speed,headway in the reconstruction and extension of expressway work zone,and establishes the speed flow regression model based on the measured speed flow data.It is found that the capacity of the construction area has changed significantly before and after the traffic interruption.The percent of the flow rate decrease before and after the traffic interruption in the 2-1 construction area(two lanes in one direction,one lane closed)is 8.56%,the percent of the flow rate decrease before and after the traffic interruption in the 3-1 construction area(three lanes in one direction,two lane closed)is 10.56%,and the percent of the flow rate decrease before and after the traffic interruption in the 3-2 construction area(three lanes in one direction,one lane closed)is 9.75%.The influence of the proportion of large vehicles,the form of lane closure,the speed limit and the opening length of the median on the capacity are quantified.The correction coefficient of the proportion of large vehicles to the capacity is determined.The recommended capacity values under different lane closure forms,different speed limits and different opening length of the median are given.The study of this paper can provide a theoretical support for traffic organization in expressway work zone.