The Mechanical Response And Design Method Of Asphalt Pavement On Steep Slopes And Sharp Turns Section

With the rapid development of the national economy and the progress of scientific and technological, high-grade asphalt pavement will be used more and more widely. At the same time as the road mileage increasing, early destruction of the road will be more and more serious ,especially on steep slopes and sharp turns section , the rutting along the wheel tracks is more obvious.Therefore, it is necessary to analysis the mechanical response and structure of the asphalt pavement on steep slopes and sharp turns section. Improve the design method of asphalt pavement on steep slopes and sharp turns section ,for ensuring and improving the quality and service life of the road, reducing the investment of road construction and post-maintenance costs.To address the above problems, this paper using ANSYS finite element program, select the semi-rigid base asphalt concrete pavement typical structure for model building and carrying out numerical analysis. By analyzing the characteristics of the road by the force under the different speed, different slope and different radius on steep slopes and sharp turns section. With the finite element model, calculated the surface mechanical response (including the largest deflection, the maximun shear stress of structure layer, maximum tensile tress, maximum compressive strain, etc.). Obtain the following major conclusions by studying:1. On steep slopes, with the slope increasing, the value of the road surface deflection is corresponding increasing, the tensile stress at the end of layer increasing (but the increase is slight), and the shear stress increasing rapidly.2. On sharp turns section, the flat curve radius changing on the value of deflection dose not much impact, but with the radius becomes smaller and smaller, the tensile tress at thee end of layer and shear stress is increasing rapidly.3. On steep slopes and sharp turns section, with the slope decreasing and the radius reducing, the road surfaces deflection and tensile stress at the end of layer will increase correspondingly.In this conclusion to this article on the basis of the results obtained, compare the normal section of the mechanical response and design methods, and perfect the pavement design method on steep slopes and sharp turns section.