A Design Method of Durable Asphalt Pavement Based on Dual Modulus Theory and Its Pavement Structure

Abstract

The invention discloses a durable bituminous pavement design method based on a double-modulus theory. According to the method, on the basis of a layered elastic system theory under bicircle vertical evenly-distributed loads, the double-modulus theory is introduced, when pavement mechanical calculation is conducted, according to difference of stress, tension and compression of points on the pavement, corresponding tension and compression modulus are given, a design method which confirms to the real pavement stress property more is built, and the pavement design precision is improved. The maximum tension stress of a semi-rigid base and the sub-base bottom and the maximum tension strain of an asphalt surface course of the pavement designed according to the method are far lower than the fatigue limits of the maximum tension stress and the maximum tension strain, thus the service life of the pavement is greatly prolonged, and the requirements for the durable bituminous pavement are met; moreover, damage to the pavement only occurs on the pavement surface, so that a pavement damage mode transforms from from bottom to top to from top to bottom, therefore, during maintenance, only the upper surface layer needs to be subjected to milling and top facing, and thus the maintenance cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of asphalt pavement design, and in particular relates to a durable asphalt pavement design method and a pavement structure based on the double modulus theory. Background technique [0002] Since the 1990s, my country has achieved fruitful results in the construction practice of high-grade road asphalt pavement. However, judging from the use status of the asphalt pavement that has been put into operation, most of them have experienced serious functional attenuation and structural damage before reaching the service life. The reasons for this are not only the construction quality and overloading, but also the theoretical system of structural design. It is also one of the important reasons. [0003] At present, the asphalt pavement design method in my country adopts the theory of isotropic layered elastic system, and the material parameters of each layer are calculated using the compressive rebound modulus. The...

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Problems solved by technology

There are tensile stress areas and compressive stress areas in the pavement structure under load, so simply using a larger compressive modulus of resilience as the unified modulus of the material in the calculation of pavement mechanics will lead to large differences in our calculation results. Errors or overestimation of the performance of the designed pavement. The errors generated during these calculations lead to the inconsistency between the pavement failure mode set by the asphalt pavement structure design theory and the typical disease characteristics of the actual pavement, so that the strength and stiffness standards used in the design cannot effectively play a controlling role.

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