Vibrating wheel-asphalt pavement structure dynamics finite element model establishing method

Abstract

The invention relates to a method for establishing a dynamic finite element model of a vibrating wheel-asphalt pavement structure. Belongs to the field of asphalt pavement structure vibration compaction process analysis and calculation. The method comprises the following steps: based on a Delft-Xahu constitutive model of a hot-state asphalt mixture, establishing a stress-strain relational expression when the asphalt mixture is compressed under a high-temperature condition; six viscoelastic-plastic parameters under each cycle are obtained through an MTS compression test, subprogram secondary development is conducted on Abaqus software based on VUMAT and VUSDFLD subprograms, and a vibrating wheel-asphalt pavement structure dynamic finite element model is established through the six viscoelastic-plastic parameters obtained through the MTS compression test. Not only is a basis established for dynamic characteristic analysis and dynamic response mechanism research in the asphalt pavement compaction process, but also an important guidance basis is provided for optimal design and real-time adjustment of working parameters of the road roller in the asphalt pavement compaction process, so that related problems in the field of asphalt pavement structure vibration compaction are solved.

Description

technical field [0001] The invention relates to a vibration wheel-a method for establishing a dynamic finite element model of an asphalt pavement structure, and belongs to the field of analysis and calculation of the vibration compaction process of an asphalt pavement structure. Background technique [0002] As of the end of 2020, the country's total highway mileage was 5,198,100 kilometers, including 161,000 kilometers of expressways. As asphalt pavement has the advantages of smooth surface, no joints, comfortable driving, low vibration and low noise, it has been widely used in highway construction. At present, asphalt pavement accounts for more than 50% of the completed highways in the country. The proportion is more than 90%. With the increase of traffic volume year by year and the improvement of driving speed, people continue to put forward new demands, and the quality of highway construction has been paid more and more attention. The poor quality of pavement compactio...

AI Technical Summary

Problems solved by technology

The viscoelastic model does not consider the plastic properties of the compacted material, and is only applicable to the case where the compacted material is close to compaction or completely compacted, and cannot describe the impact of the compacted material on the vibration response due to plastic deformation during the compaction process

Although the nonlinear hysteretic model considers the asymmetric characteristics of the compressed material during loading and unloading, it does not directly describe the plastic characteristics of the compressed material by using the asymmetric hysteretic curve to consider the dynamic nonlinearity caused by the asymmetry.

The viscoelastic-plastic model including plastic elements can simulate the dynamic characteristics of the vibrating wheel-pavement structure and the elastic-plastic characteristics of the compacted material, which is more consistent with the actual situation. There are few and incomplete studies on pavement, which cannot comprehensively reflect the viscoelasticity and plasticity of asphalt mixture under high temperature conditions.

In addition, the rolling speed of the road roller is an important factor affecting the compaction quality, but most of the current vibration compaction models fail to consider the rolling speed

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