| With the increasing number of cars and the increasing speed of cars,the current roads are facing increasingly burdensome transportation tasks.At the same time,the frequency of traffic accidents is also increasing.How to ensure the safe driving of vehicles makes the road construction face a more severe test.The lack of anti-sliding performance of the road surface is an important factor in the occurrence of accidents,especially the road surface becomes wet and slippery in rainy weather,and the water film affects the contact state of the tire and the road surface.High-speed vehicles are prone to slipping under the action of water,and the braking distance of the vehicles will also increase,increasing the probability of accidents such as rollovers and rear-end collisions.Therefore,how to ensure safe driving of cars in rainy weather is an urgent problem to be solved.In this paper,from the perspective of tire-road texture contact coupling,a theoretical model of tire-wet asphalt pavement friction coefficient is established.It can further reveal the anti-sliding mechanism of asphalt pavement,and the research results can provide theoretical guidance for the anti-skid design of wet pavement.In this paper,from the perspective of tire-road texture contact coupling,a theoretical model of tire-wet asphalt pavement friction coefficient is established.It can further reveal the anti-sliding mechanism of asphalt pavement,and the research results can provide theoretical guidance for the anti-skid design of wet pavement.This article first analyzes the mechanism of friction between tire roads: the interaction between the pavement texture and the tread rubber is the basis for generating friction.Specifically,it explores the influence of various factors on friction coefficient from three aspects of tire characteristics,pavement texture characteristics and water film.The signal processing method was used to study the elevation texture information features of the road surface,and the texture features of the asphalt pavement were numerically expressed through the power spectrum of the fractal surface.The surface texture information of SMA-13 and SMA-16 rutting plate in dry and wet state is extracted by using infinifocus G5,and the data processing method is proposed to provide data support for subsequent theoretical calculation.Secondly,analyze the function of the water film.The presence of the water film will change the texture and appearance of the asphalt pavement,change the power spectrum information of the pavement,and appear a closed "pool" phenomenon.From the two aspects of water viscosity and inertia,explore the influence of hydrodynamic force on the interaction between tread rubber and asphalt pavement surface texture.Based on the analysis of the water film,and combining the derived asphalt power spectrum calculation theory with the Persson friction theory,a coupled friction model of wet road and tire is constructed,and the friction coefficient calculation formula is derived.And analyze the influence of parameters such as pavement texture characteristics,rubber relaxation time and speed in the formula on the friction coefficient.Finally,the accuracy of the anti-sliding risk model was verified through experiments:First,a DFT test platform was built to measure the friction coefficient of SMA-13 and SMA-16 rut plate test pieces with speed under dry and wet conditions.The results show that the anti-slip performance of SMA-16 pavement is better than that of SMA-13 pavement,and the friction coefficient of wet slippery state is about 20% lower than that of dry state in the same graded pavement.Subsequently,the extracted SMA-13 and SMA-16 rutting put texture information was substituted into the derived theoretical formula of the friction coefficient of the tire-wet asphalt pavement surface,and the curve of friction coefficient with speed was calculated.Finally,the theoretical calculation results are compared with the actual DFT measurement results.The analysis results show that the established anti-sliding risk model of wet asphalt pavement based on tire-road coupling is reasonable and reliable. |
