Abstract:

In this paper， changes of skid resistance， water seepage and noise reduction performance of drainage asphalt pavement in Guangdong Province in recent years were compared and analyzed. The reduction ranges of road traffic accidents before and after the construction of drainage asphalt pavement were studied and the water seepage coefficients in different positions of drainage asphalt pavement lanes were tested. A new test method to test and evaluate the lateral drainage capacity of drainage asphalt pavement was put forward. The results show that the initial anti-sliding performance of the small particle drainage asphalt pavement is relatively high， but the anti-sliding performance begins to decline two years after construction. The anti-sliding performance of large particle drainage asphalt pavement continues to show an upward trend after two years of construction. The attenuation of water permeability coefficient of small particle size drainage asphalt pavement is faster than that of the large particle size drainage asphalt pavement. The water seepage performance of the vehicle wheel track belt is greater than that of the middle of the wheel track belt and the road shoulder. The thickness of the drainage asphalt pavement with large particle size is twice of that with small particle size， but its lateral drainage capacity is 2.39 times of that with small particle size. After the paving of the drainage asphalt pavement， the number of accidents in sunny days， rainy days and in all of the days in the statistical sections were reduced by 64.3%， 57.1% and 59.5% respectively. Drainage asphalt pavement plays a positive role in improving the traffic safety of drainage difficult points in expressways. This paper can provide reference for engineering decision in the construction and maintenance of drainage asphalt pavements.

Key words: road and railway engineering, drainage asphalt pavement, traffic accident reduction, drainage performance