The Research On Safe Alignment And Lighting In Small Radius Spriral Tunnel Of Highway

The special geographical environment in the mountainous area decide that the standard of highway construction should be adjusted to local conditions.Spiral tunnel will be more public due to the need of surmounting large height difference and avoiding unfavorable geology region.Beacause there are few spiral tunnels arround the world,and few detailed articles according to the criterion.It is significative to do some research on risk prediction and vehicle driving safety for the tunnel operation safety.According to the Ganhaizi Small Radius Spiral Tunnel,researches on the influence of traffic safety by alignment and lighting are processed.According to the classic dynamics and targets like stoping sight distance etc,researches on safe alignment are processed by bringing projects in which wider cross-section and smaller radius are considered.Combined with computer simulation technology,automobile system dynamics model,road model and driver's model are gained,and the real time data was obtained while the vehical was moving in each project.Analyse to the datas indicates where the insufficient safe road section is,and solutions are given in this thesis to optimize the design of safe alignment.On the research of safe lighting,A illumination model of tunnel's entrance is builded base-on sunlight analysis by DIAlux.Propositions are given to the decrement of illumination on the tunnel's entrance.This thesis takes the tunnel's entrance as study object to analyze its sunlight change during different time and season.and puts forward some suggestions on the light-adusting of artificial illumination.As the vehical is moving in a curve and also a slope, there is no method to calculate its smog emission amount according to the criterion.With the help of some empirical formula and data from Adams,a calculation model of smog emission and required airflow is formed to take quantitative analysis in this spiral tunnel.