An Incremental Method for Asphalt Pavement Structural Analysis Based on Pavement Material Modulus Stress and Strain Dependent Model

Abstract

The invention relates to a bituminous pavement structural analysis and increment method based on a modulus stress and strain dependence model of pavement materials. The method includes the steps of according to the structural pattern and material type of a bituminous pavement in a simulation analysis, determining the thickness and Poisson's ratio of each layer and the modulus stress and strain dependence model of the pavement materials, adopting the modulus stress and strain dependence model of the pavement materials to represent the modulus of each layer of a bituminous pavement structure, combining calculation load with interlayer combination conditions to create a calculation analysis system, using an increment method as an analysis basis, obtaining a modulus matrix of each point of theinteriors of pavement structural layers through finite element software numerical calculation, and based on the steps above, calculating the stress, strain and displacement of an arbitrary point in the bituminous pavement structure according to an elastic layered system theory. According to the method, influences caused by non-linear problems of materials on pavement mechanical calculation are taken into account to make the force analysis of the bituminous pavement structure more reasonable and complete.

Description

technical field [0001] The invention mainly relates to the field of road engineering, in particular to the force analysis problem of the asphalt pavement structure caused by the non-linear characteristics of the pavement material. Background technique [0002] The real mechanical response of pavement structure under load has always been a basic theoretical issue in the research of pavement structure analysis theory and design method. Due to the diversity and complexity of the constituent materials, the mechanical response of pavement structures under the action of vehicle loads and natural environments often shows obvious nonlinear characteristics. Over the years, in order to reveal the evolution mechanism of the service performance of pavement structures and establish a design theory that is more in line with the actual pavement structure and mechanical response behavior of materials, researchers at home and abroad have been working hard to explore the real mechanical respo...

AI Technical Summary

Problems solved by technology

Over the years, in order to reveal the evolution mechanism of the service performance of pavement structures and establish a design theory that is more in line with the actual pavement structure and mechanical response behavior of materials, researchers at home and abroad have been working hard to explore the real mechanical response of pavement structures under load. Non-linear characteristics, often can not get satisfactory results

[0003] At present, the pavement structure analysis method based on the assumption of linear elasticity, because the physical equation cannot correctly describe the nonlinear constitutive relationship of asphalt pavement materials, and the diversity of structural layer modulus test methods and the uncertainty of the value, it is difficult to Accurately and objectively evaluate the real stress state of the pavement structure, which is not conducive to guiding the design of new pavement and the life evaluation of pavement in service

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