Modulus decay-based asphalt pavement structure relative deflection calculation method

Abstract

The invention provides a modulus decay-based asphalt pavement structure relative deflection calculation method. According to the method, the initial resilience modulus E0 of an asphalt pavement structure surface layer, a base layer and a roadbed is selected; a modulus decay rule of each structural layer of the asphalt pavement is obtained through a fatigue test; starting from the modulus decay rule, the ultimate rebound modulus Emin of each structural layer of the asphalt pavement and the change rule of deformation of each structural layer of the asphalt pavement along with the road age are obtained, and then the road age is divided by the service life of the pavement structure, so that the decay rule of relative deflection of the asphalt pavement structure along with the life cycle ratiois obtained. The method has the advantages that on one hand, theoretical innovation is achieved, the defects of existing deflection theoretical calculation are overcome, and the difference between a measured value and a calculated value is reduced; on the other hand, modulus decay and relative deflection are combined, the deflection evolution rule of the asphalt pavement structure is disclosed more objectively, the prediction precision of the deflection evolution rule is improved, and meanwhile, a certain theoretical basis is provided for the structural design of the asphalt pavement.

Description

technical field [0001] The invention relates to a method for calculating relative deflection of asphalt pavement structure based on modulus decay. Background technique [0002] In the process of road operation, due to the repeated action of the external environment and traffic loads, damage will occur inside the asphalt pavement structure; as the number of loads increases, the damage will continue to evolve and accumulate, and the ability of the pavement structure and materials to resist deformation will also occur. Decay, the deflection decay law of asphalt pavement structure under repeated load is one of the core contents of the theoretical system of pavement structure design. However, the change of road surface deflection is a complex process of comprehensive effects of many factors. Under the influence of factors such as the environment and the equipment used, it is very easy to have the problem that the deflection calculated by mechanics is seriously inconsistent with ...

AI Technical Summary

Problems solved by technology

Although the consistency and predictability of the corrected deflection values ​​have improved to a certain extent, the pavement deflection measured by different structures, different grades, and different periods has low comparability, and the pavement deflection changes with time. Problems such as the lack of objectivity of the law still exist

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