Research Of Anti-sliding Performance Based On The Structure Characteristics Of The Pavement

To ensure the safe and reliable braking, the pavement must have excellent anti-sliding performance. Pavement anti-sliding performance mainly depends on the macro-structures,rough-structures and micro-structures. The anti-sliding performance mainly depends on the macro-structural features and the rough-structural features at higher speed, while it depends on the micro-structural features at lower speed.Combined with the micromechanical analysis of tires on the braking process, the impact of the pavement structure is discussed to the anti-sliding performance and the generated mechanism by different structural characteristics parameters. Based on energy theory, the friction effect mechanisms are discussed, when aircraft landing brake, and it is analyzed that the basic rules of the anti-sliding performance is generated by structural characteristics parameters on the aircraft rolling and sliding braking process. According to the analysis of the friction mechanism of macroscopic and microscopic, expression analysis model of Friction coefficient(?) is constructed based on pavement structural features multi-parameter(groove width(b), groove depth(h) and groove spacing(D)) to express pavement anti-sliding performance. According to the impact of the key parameters to the anti-sliding performance model, the experimental study of different structural parameters(including the groove chamfer ?) is carried out to the impact of the pavement friction coefficient, and it is further explored how the parameters influences the friction coefficient.The results showed that the macro-structural and rough-structural of Pavement play a key role in braking effect, when aircraft lands with a high speed. With the increase of groove spacing, the anti-sliding performance has been gradually decreasing trend; pavement anti-sliding performance with the increase of groove width decreases after increasing first,there is a maximum of the anti-sliding performance when the groove width is 6 mm; with the increase of groove depth, the anti-sliding performance is presented first increases then decreases, the groove depth 5 mm is maximum. Based on the analyzing of influence rules of multi-structure parameters to the anti-sliding performance, friction coefficient of pavement can be comprehensive expressed on the four structure parameters.The groove chamfer ? has a significant effect on anti-sliding performance. When the groove chamfer is 90°, the anti-sliding performance is supreme; while the anti-sliding performance is relative minimum with the chamfer at 45°. When the contact condition between macro structure of pavement and the tire rubber is different, the effects of the structural parameters to the adhesion friction effect, deformation effect and furrows friction are different. Thereby, structural parameters show significant coupling effect to anti-sliding performance. When the groove width keeps unchanged, the friction effect increases with theincrease of the groove depth; when the chamfering angularity becomes lager, the groove depth has a more significant effect on the friction effect; with the increasing of the groove width, the skid resistance has a trend of decreasing after increasing first. Based on the purpose to improve the comprehensive pavement skid resistance, multiple parameters coupling effects need to be considered.