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Mechanical Behavior Analysis of Asphalt Pavement Based on Measured Axial Load Data

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Abstract

The objective of this study is to clarify the mechanical response behavior of each structural layer of asphalt pavement under actual traffic load and the variation law of related mechanical parameters. In this study, the traffic volume of a high-grade highway in China from 2020 to 2021, and the characteristics of traffic flow were clarified. Meanwhile, the axle load detection equipment was used to measure the axle load of trucks in the investigated, and the axial load spectrum of these trucks was established based on the measured data. According to the actual traffic volume, the equivalent axle number of accumulated standard axle load of BZZ-100 is calculated, and the calculation model is established using finite element software. The variation law of rut depth on road surface, tensile strain and shear stress in asphalt pavement and tensile stress at base layer (including base layer) under different axle load times is analyzed. The results of traffic volume survey and finite element analysis show that the annual average growth rate of freight cars from 2020 to 2021 is 7.4%; the cumulative standard axle load equivalent number in 2021 is 1.06 times higher than that in 2020. The maximum tensile strain and maximum shear stress of each structural layer of asphalt pavement are located in the depth of 3-5 cm of pavement structure, that is, the bottom of the upper layer of asphalt pavement. When the number of axle load increases from 3.4 × 107 to 7.0 × 107, the bottom base bending tensile stress increases 1.74 times and the base bending tensile stress increases 1.72 times.

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Acknowledgements

The author would like to thank Dr. Yiming Li for his help in this study and his valuable comments in the process of writing this paper. Thanks for the support of the Central Finance Special Funds for the Development of Local Colleges and Universities (ZZJ0219101C, ZZJ0220101C). Thanks for the support of Zhejiang Shuren University Talent Start-Up Fund (2022R014).

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Correspondence to Yu Dezhong or Zhao Qianqian.

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Dezhong, Y., Qianqian, Z., Luyu, Z. et al. Mechanical Behavior Analysis of Asphalt Pavement Based on Measured Axial Load Data. Int. J. Pavement Res. Technol. 17, 460–469 (2024). https://doi.org/10.1007/s42947-022-00248-w

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