Experimental Study On Supporting Effect Of Base Course In Permeable Pavement Of Navigable Airport

With the development of the country's economic, the number of the navigable airport is growing, but the development of the existing construction technology still can not meet the requirements of the construction and operation of airport, particularly its flight zone Field Road project is still lack of technology to adapt to its system. Among them, the water environment of the road surface and airport flight zone area has become one of the issues which restrict the development of navigable airport. At present, pervious pavement has become one of the main ways to solve these problems in view of its rapid infiltration of the rainwater. However, since the airport pavement needs to bear higher loads, the structural stability is still a worrying problem, especially the stability of structure after flooding.To ensure the stability of the base course after flooding, we researched the surface and base course of the pervious pavement combining with its features of mechanics. We built the analysis models of the pavement based on flexible pavement theory and got the way to calculate modulus of the base course by BISAR. We got the variation of deflection of the pervious pavement along with the change of thickness, modulus and location of geogrid by way of FEM. We tested different load levels, geogrid settings and their location on the influence of the mechanical behavior of the structure. The theoretical analysis and experimental results show that setting the geogrid in base course can significantly improve load capacity of the structure. And the best location of the geogrid is the top of the base course but not the most top of the base course. The base course should set a protective layer to ensure the normal function of geogrid. In addition, the thickness of the course and modulus of the subgrade will also directly affect load capacity of the pavement structure. Based on the results of the experiment, we proposed a formula of defection of the pervious pavement when it is under center pressure after the correcting of FEM'S parameter, and it can provide a scientific basis for structural designing and construction technology improving.