The Selected Problems of Multi-layer Pavements – Influence of Composite Impacts Vehicles and Climatic Factors on the Behavior of Roads Pavements

AbstractMulti-layer pavement models, which utilize solutions such as the one of Boussinesq, Burmister, Kogan, Odemark and others, contain many simplifications that have a significant influence on the estimated real value of stress, strain, deflection as well as on the coefficient of pavement layers interaction.In the article based on the experiments carried out, we want to present our own layered- pavement models and solutions to them, which can be used mainly in the diagnostics of bearing capacity. The estimation of bearing capacity is conducted on the basis of full time data obtained with the FWD device.In order to prove the climatic factors impact on the bearing capacity of the multilayer pavement structure a theoretical analyses of the joined dynamic and thermal impacts has been performed. Additionally qualitative and quantitative changes of road surface deflection in a thermo-viscoelastic model were presented. In the proposed model it was examined the impact of the relevant climatic factors, inter alia, such as: stream of solar radiation, humidity and wind speed on the surface pavement deflection bowl under load dynamic.Moreover, the conclusions implicated by the above mentioned analysis are of big importance in design and operation process of road and airfield pavements. They pertain not only to the influence of modulus and thickness of particular layers but also to the way of pavement layers interaction, Poisson's coefficient and others