A Modulus Inversion Method for Structural Layers of Asphalt Pavement

Abstract

The invention discloses a method for inversion of the modulus of an asphalt pavement structural layer, belonging to the field of road engineering. The method detects the surface deflection of a pavement structural layer layer by layer, inverts the pavement structural modulus layer by layer from the bottom to the top, and removes the soil base model. In addition, the inversion results of the substructure modulus are substituted into the modulus inversion of the previous layer until the inversion of all pavement structure layers is completed. Compared with the prior art, the present invention provides a reliable method for the inversion of the modulus of the pavement structure layer, and solves the technical problem that the solution of the traditional inversion method is not unique and the inversion result is inconsistent with the actual situation; at the same time, the present invention obtains the The soil foundation modulus under different stress states solves the technical problem that the traditional inverse calculation method cannot determine the stress dependence characteristics of the soil foundation modulus, provides an effective technical means for the evaluation of the pavement structure performance, and has a good popularization and application value.

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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