Study On The Work State Of Different Asphalt Pavement Structure Of Layer Interfaces

This paper first proposes it is necessary to research new asphalt pavement structure, because of currently asphalt pavement structural style to be unitary, road surface early injury serious and so on questions in our country. Trial in Inner Mongolia region, combined with the special natural environment in Inner Mongolia and the actual traffic conditions, the development of the three categories of five asphalt pavement structure (including the flexible asphalt pavement, full depth asphalt pavement, asphalt pavement combined), according to Interior material test results and the current "Asphalt Pavement Structure Design", established the necessary road material modulus, split tensile strength and other design parameters.Secondly, this paper simulates and analysises five kind of asphalt pavement structure by using the Bissar3.0 design software, draws the following important conclusion:(1) Under the effect of the loading,graded crushed stone adjust position, at the same time, stress will redistribute, crushed stone will re-arrange, so the crack obtains the certain extent closing, therefore the graded broken stone material in the crack question, has the self-recovery characteristic.(2) The main advantages of full depth asphalt pavement is that its total thickness is thinner than a conventional asphalt pavement, reduce the possibility of fatigue cracks,limit road damage that may occur in the upper part of the road structure.(3) More subgrade modulus is better for the pavement structure fatigue life, in order to prolong life of the pavement structure, you can design appropriate modulus of base material and improve the road base thickness and subgrade strength.(4) when modular structure of an asphalt pavement surface layer thickness from 5cm up to 11cm, the tensile strain increases gradually, and the tensile strain in11cm place is the largest, then follows with the change of thickness and tensile strain is reduced slowly.(5) Graded gravel layer should not be too thick, if that will speed up the asphalt surface fatigue damage, at the same time, should not be too thin, if that will not be able to fully play its role to prevent reflective cracking, integrated various factors, propose that about 15-20cm more appropriate.Finally, the paper tests experimented the road section and analysis road performance, and analysis disease causes and prevention measures,of asphalt pavement with different combinations, to achieve the pavement structure from the early damage of asphalt pavement for the purpose of prevention and cure. Accordingly, recommended a five for a typical asphalt pavement structure.