Research on dynamic evaluation model and early warning technology of anti-sliding risk for the airport pavement

摘要

The contact between tread rubber and pavement surface texture has significant impact on the sliding state during the ultra-high velocity takeoff and landing process of aircraft. Their respective characteristics and coupling effect provide the material basis and essential source for the tire-road friction. In this study, the Fourier transform theory and fractal theory were used to derive the power spectrum approximation formula for pavement surface. Based on the fractal characteristics of surface texture and the viscoelastic properties of tread rubber by testing and analysis, the anti-sliding risk model of airport pavement under dry and slippery condition were established with taking friction coefficient as evaluation standard. Specifically, the surface texture information of the pavement surface was obtained by using a three-dimensional surface measuring instrument called InfiniteFocus. The sensitivity of the pavement texture parameters, tread rubber parameters and external environment to the friction coefficient was calculated by model, and the correctness of the model was verified by DF test. Finally, based on the theoretical model, one kind of dynamic early warning technology of anti-sliding risk for airport pavement was developed. The specific conclusions for this study are as follows: Asphalt mixture with larger particle size and wider texture range can improve the anti-sliding performance of the airport pavement; Under high velocity conditions, the shorter the tread rubber relaxation time is, the stronger the anti-sliding performance of pavement is, and the smaller the influence of compressive stress on the anti-sliding performance is; With the increase of velocity, the anti-sliding performance of pavement decreases rapidly in the beginning, and the downward trend slows down after 200 km/h; The presence of water film on the pavement surface will significantly reduce the anti-sliding performance of pavement and increase the risk during aircraft taking off and landing; The DF test proves that the anti-sliding risk model established in this paper is reasonable. (C) 2019 Elsevier Ltd. All rights reserved.