Study On Impacts Of Subway Occupying-road Construction On Urban Road Capacity

With the development of China’s economic and improvement of urban vehicle fleet, urban transportation has become a very serious social problem.In recent years urban subway with its on time, fixed-point, quick, zero pollution, large capacity, low energy consumption advantages, for more and more cities adoped. Because of urban subway occupying-road construction, subway lines under where the road has lost its role in urban transport corridors, making road capacity is reduced.Through in-depth system analysis of the impacts of subway occupying-road construction, for identify a specific construction enclosure measures, optimizate the traffic organization scheme,it has a certain guiding significance.In this treatise, through theoretical research and practical investigation and simulation analyze of the three aspects of subway occupying-road construction impact on urban road traffic made in-depth analysis. Firstly introduces the subway interval occupying-road construction and two relatively common enclosure of the subway site occupying-road construction, and analyzes their respective characteristics,then respectively study the road basic characteristics, the traffic participants characteristics, vehicle running characteristic, etc.Secondly, based on the selected section of subway occupying-road construction and do not build subway intersection do traffic investigation, and then according to the data sorting, established the simulation model respectively, and according to the actual form of enclosure in the intersection the joining construction enclosure intersection simulation model is established respectively. Then calibrated the parameter of road construction model and intersection construction model by orthogonal experiment method, verified the validity of the model.Again, on the basis of section simulation model parameters calibrated,through the simulation get subway occupying-road construction essentially road capacity, do quantitative analysis of influencing factors road construction capacity by simulation software, established the subway construction section capacity compute model.Finally, On the basis of the intersection model parameters calibrated, this treatise puts forward the concept of the intersection maximum allowable transit traffic volume, by change the road intersection traffic volume, through simulation calculate the intersection the maximum allowable transit traffic volume in all directions, by the change of maximum allowable transit traffic volume under different conditions, to reflect the change of the intersection road capacity.