Research On The Paragraph Long Straight Downhill Asphalt Pavement Anti-sliding Performance

The central and western regions of China's special geographical position,topography is characterized by high altitude,heavy high hill and mountain areas,the gap between the terrain is large,Therefore, there are many long steep inevitably in the central and western road. Vehicle in those long downhill often occurred big traffic accidents,on the reasons,inadequate anti-sliding surface is one important reason.Paragraph long straight downhill more and more serious traffic safety situation caused by the attention of various departments.The researchers of country from the stone types,the specifications of stone,asphalt materials,gradation of mineral aggregate components and macro-surface roughness various aspects,in order to enhance the anti-slide performance of the road.This paper based on SiChuan Ya Lu highway,to research the anti-slide performance of the long straight downhill on asphalt surface,seek the effective measures to improve the anti-slide performance.Analysis the vehicle characteristics and speed on straight downhill,longitudinal will cause the level of force,and when the vehicle brak,the level of force will rapidly increasing,speed of downhill is generally higher than other sctions,and because of the slope is too long,the braking time of the vehicle is long.Through self-contained system of variable-speed variable instrument track for the indoor simulation experiments,to explore the types of aggregate,mineral aggregate gradation, mineral aggregate specifications for the three anti-sliding on the asphalt pavement performance,in the role of attenuation process,and to compare the comprehensive performance,finally find the surface layer SMA-16 of the better anti-sliding,research the anti-slide impact of the axle load and speed,though experimental analysis find out that axle load do significantly affect of the anti-sliding performance.the impact of the speed is not obvious,although when the speed is increase,the attenuation rate of the mixture is increase,the magnitude of increase was not apparent.According to different round pressure,different action number of times of the corresponding test data,Walk to establish the number of wheels,wheel pressure and put the value of the relationship,to predict the anti-sliding performance in the design life of Lu Ya highway.The forecast results show that when the load of vehicles is Loaded,in pavement design life the anti-slide performance is good,and overload do serious damage of the anti-slide performance,because when the axle load is increase,the number of is not accordance the poportional increase,but similar in accordance with the exponential increase.Therefore,the impact of anti-sliding performance for the overloading vehicles is not linear with the axle load growth but changes exponentiall.