Traffic Flow Modeling And Traffic Safety Analysis In Hydropower Construction

Hydropower construction is a complex system engineering,and its transport system has an important role in construction schedule.In hydropower construction,material schedule optimization,construction equipment optimization,and traffic safety analysis are all based on traffic flow model.Morever,traffic conditions in hydropower construction are different from those in urban area.As a result,it's very significant to do some research on traffic flow in hydropower construction.Considering traffic properties in hydropower construction,traffic flow model,traffic accident model,and queueing model are established.Then,traffic safety are analyzed in detail.The main contributions of this paper are summarized as follows:Firstly,considering traffic properties in hydropower construction,including slope,drivers' psychological quality,and dump trucks'performance,vehicle's car-following model and lane-changing model are established.Then,traffic flow model in hydropower construction is established,which is based on improved cellular automata model.Setting one-direction road with two lanes as simulation scene,the influence of randomization probability and slope on traffic flow is analyzed.Furthermore,the traffic flow model is verified by real data in hydropower construction.Secondly,factors which cause traffic accident in hydropower construction are analyzed,and vehicle rear-end accident is studied mainly.Then,vehicle rear-end accident model is established and introduced into traffic flow model.The number of accident within different headway distance is counted in simulation,and its distribution is fitted and tested.The result shows that its distribution is the normal distribution.Then,safety distance is set by "4?" rule.By compared with relevant standard,the accident model is verified for its accuracy.Finally,vehicles' accident queueing behavior is studied with queuing theory.For long duration-time accident,a variable input rate queueing model is established.Based on the queueing model,an optimization model is built to minimize cost by reducing the number of dump trucks.For short duration-time accident,a variable service rate queueing model is built,and several indicators of road performance are analyzed.TransModeler is used to verify the model's accuracy at the end.