Back calculation method for synchronously determining modulus of asphalt pavement structure layer and Poisson's ratio of asphalt surface layer

Abstract

The invention relates to a back calculation method for synchronously determining the modulus of an asphalt pavement structure layer and the Poisson's ratio of an asphalt surface layer, which comprisesthe following steps of establishing a relation model between the dynamic modulus E and the Poisson's ratio Mu of an asphalt surface layer material, and determining a group of actually measured deflection basin data of a to-be-back calculated pavement through a drop hammer deflectometer; calculating to obtain a group of surface layer, base layer, subbase layer and soil-based moduli through a pavement structure layer modulus inversion method based on a homotopy algorithm; and then substituting the asphalt surface layer modulus calculated by inversion into the relation model of the asphalt surface layer material dynamic modulus E and the Poisson's ratio Mu to obtain a modified Poisson's ratio of the asphalt surface layer; and finally, determining the final modulus of each structural layer ofthe pavement and the Poisson's ratio of the asphalt surface layer through iterative calculation. According to the method, the temperature dependence characteristic of the poisson ratio of the asphaltsurface layer material is considered, so that the back calculation result of the modulus of the asphalt pavement structure layer is more accurate and reliable.

Description

technical field [0001] The invention relates to the field of road engineering asphalt pavement, in particular to an inverse calculation method for synchronously determining the modulus of the structural layer of the asphalt pavement and the Poisson's ratio of the asphalt surface layer. Background technique [0002] Since the falling weight deflection meter (FWD) has many advantages such as safety, non-destructiveness, quickness, convenience, and reasonable accuracy, it has been widely used in the evaluation and analysis of the bearing capacity and service performance of asphalt pavement structural layers since it came out in the 1970s. The working principle of the drop weight deflection meter is to apply a dynamic load simulating the driving action on the asphalt pavement surface, and measure the deflection at different positions away from the load center under the load, so as to obtain the measured deflection basin of the asphalt pavement structure. According to the measure...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for synchronously determining the modulus of the asphalt pavement structure layer and the Poisson's ratio of the asphalt surface layer, so as to solve the problem that the Poisson's ratio temperature of the asphalt surface layer material is not considered in the existing pavement structure layer modulus back-calculation method Insufficient dependence, which is conducive to a more reasonable and scientific evaluation of the modulus characteristics of pavement structural layers in different seasonal environments

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