Study on drainage path length and water film thickness of wide pavement based on Fluent simulation
Compared to ordinary integral two-way four-lane or six-lane highway,eight-lane and wider-lane highways exhibit characteristics such as wider road width,larger traffic flow,long drainage time,etc.which makes them more prone to road surface water accumulation under heavy rainfall conditions.By conducting the Fluent Simulation modeling on the S-curve superelevation transitioning road sections of the wide-lane road conditions under the same rainfall amount,researching the variations of the maximum drainage path length and the distribution of the water film thickness on the inner lane under different conditions of road width,longitudinal slope,cross slope and the superelevation runoff gradual change ratio,the influences of the highway alignment design indexes on the drainage path length and the thickness of the water film on the road were analyzed.Research results suggest that increasing the superelevation gradient rate usefully reduces the maximum drainage path length and the thickness of water film on the inner side of the driving lane(inner side of the highway?).Increasing the longitudinal slope advantageously reduces the thickness of the water film on the inner side of the driving lane but significantly increases the maximum drainage path length.Increasing the road width leads to an increase in both the maximum drainage path length and the thickness of the water film on the inner side of the driving lane.SPSS linear regression analysis indicates that the longitudinal slope has the most significant impact on the maximum drainage path length and the thickness of the water film on the inner side of the driving lane,while the superelevation runoff gradual change ratio has the least impact.In the design process of wide-lane superelevation runoff,adjusting the linear index combination alone may not meet the safety requirements for driving during heavy rainfall conditions.It is recommended that conducting special drainage measures to reduce driving risks.
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