Asphalt pavement structure layer modulus inversion method

Abstract

The invention discloses an asphalt pavement structure layer modulus inversion method and belongs to the field of road engineering. According to the method, pavement structure layer surface deflection is detected layer by layer, pavement structure moduli are inversed layer by layer from bottom to top, and except the soil base modulus, inversion results of the structure moduli of lower layers are introduced into inversion of the moduli of upper layers until the moduli of all the pavement structure layers are inversed. Compared with the prior art, the method has the advantages that a reliable method is provided for inversion of the moduli of the pavement structure layers, and technical problems that traditional inversion methods are not unique in solution and inversion results do not conform to actual results are solved; meanwhile, soil base moduli at different stress states are obtained, the technical problem that the traditional inversion methods cannot determine soil base modulus stress dependence characteristics is solved, an effective technical means is provided for pavement structure performance evaluation, and the method has high popularization and application values.

Description

technical field [0001] The invention relates to the field of road engineering, in particular to a modulus inversion method of an asphalt pavement structural layer. Background technique [0002] The structural modulus inversion of asphalt pavement is an important means to evaluate the structural performance of old pavement. At the same time, the inversion of the structural layer modulus provides parameters for the design of pavement structure maintenance. At present, there are many inversion methods for pavement structural modulus, including search method, genetic algorithm, inert point method, artificial neural network method, etc. Although they have been widely used, there are still the following deficiencies: 1. They are all based on the road table- The inverse calculation of the deflection basin does not fundamentally solve the problem of non-uniqueness of the inverse calculation modulus solution for multi-layer pavement structures (more than 2 layers). The modulus of th...

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Problems solved by technology

At present, there are many inversion methods for pavement structural modulus, including search method, genetic algorithm, inert point method, artificial neural network method, etc. Although they have been widely used, there are still the following deficiencies: 1. They are all based on the road table- The inverse calculation of the deflection basin does not fundamentally solve the problem of non-uniqueness of the inverse calculation modulus solution for multi-layer pavement structures (more than 2 layers). The modulus of the back-calculated pavement structural layer is not consistent with the actual situation; second, the stress dependence of the soil foundation and soil is not considered in the process of inversion of the pavement structural layer modulus, so the modulus of the soil foundation under the actual stress state cannot be determined. quantity

The shortcomings of the above-mentioned pavement structural layer modulus inversion seriously affect the reliability of pavement structural performance evaluation and maintenance design

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