| With the rapid development of national economy, in mountainous heavy hilly area building high-grade highway is absolutely necessary. But because of bad condition for terrain, environment and traffic, many diseases of rutting, lapse and upheaval appear in asphalt pavement on large longitudinal slope. Therefore, in this dissertation based on analyzing research status at home and abroad, diseases of asphalt pavement on large longitudinal slope are taken as the research object, combined with test road of Hansha highway, interlayer working state, interlayer material properties, horizontal lapse and vertical permanent deformation of asphalt pavement, anti-rutting technologies and design method of asphalt pavement on large longitudinal slope are further studied in order to propose the feasible technology of prevention and control techniques of diseases for asphalt pavement on large longitudinal slope in accordance with the current national condition.Six aspects as follows has been mainly researched in this dissertation:(1) Cause and formation mechanism of rutting, interfacial slip are investigated, prevention measures are proposed.(2) Affects of pavement structural parameters on structural stress of asphalt pavement on large longitudinal slope is comparatively analyzed, adoption principle of pavement structural parameters based on preventing diseases of asphalt pavement on large longitudinal slope is proposed. Influence law of overload, longitudinal slope, speed, turning radius, superelevation, tangential force coefficient, temperature and their comprehensive action on structural stress and horizontal lapse and vertical permanent deformation of asphalt pavement on large longitudinal slope is systematically studied. Working states under the different effects are determined, working state grade is proposed for the first time. Interlayer materials, materials and combinations of asphalt mixture suitable to each working state grade is recommended.(3) Permeability test and interlayer shear test of different kinds of layer-penetration oil are carried out, permeability sorting of different priming materials is gotten, the optimum dosages of different priming materials are determined, priming material permeabilities on semi-rigid base of different types and curing ages are studied, evaluation methods and indexes are proposed.(4) The optimum dosages of lower seal coat materials and tack coat materials are respectively determined using interlayer shear tests, shear performance sorting of them are gotten, interlayer shear fatigue performances of them are comparatively analyzed. Evaluation methods and indexes of them are respectively proposed.(5) Formation mechanism and influencing factors of asphalt pavement rutting are analyzed. Asphalt mixture design method of void volume filled by main aggregate based on anti-rutting is proposed. High temperature rutting test, variable slope rutting test, varying load rutting test and immersion rutting test of the asphalt mixture designed by it and mashell method for monolayer and composite structure are carried out for the first time, rutting resistance sortings of different asphalt mixture for monolayer and composite structure are gotten.(6) According to interlayer shear fatigue equation of different interlayer materials, structure coefficients of interlayer shear strength for asphalt pavement are modified and determined, calculation methods of allowable shear stress for interlayer materials and asphalt mixture are analyzed and determined. Shear design idea of interlayer matirials and asphalt surface materials are systematically studied, design method of asphalt pavement on large longitudinal slope considered with shear and interlayer shear fatigue is proposed for the first time. |
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