Abstract: The pressure and blocking effect of the tunnel side wall on the traffic flow causes the tunnel traffic flow to deviate from the lane, reduce the operating speed or collide. The relationship between the traffic flow operating characteristics under the tunnel side wall effect and the tunnel section optimization needs to be studied. Therefor we firstly analyze the influence of tunnel sidewall effect on traffic flow. Secondly, combined with the knowledge of fluid mechanics, the theoretical modeling of the viscous characteristics of tunnel traffic flow is carried out. Finally, the relationship between lane width, traffic flow density and viscous coefficient, the relationship between traffic flow speed, sidewall spacing and viscous force are analyzed respectively. And the conventional viscous force calibration of traffic flow is carried out by taking a one-way multi-lane tunnel as an example. The relevant conclusions of the experiment will provide a theoretical guidance for tunnel speed management and section optimization.

Key words: sidewall effect,  , viscous characteristics of traffic flow,  , compression strength,  , viscosity coefficient,  , viscous force