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To improve the back calculation stability of layer modulus in asphalt pavement and reduce miscalculation, a method based on equivalent stress diffusion for modulus back-calculation of road structural layer was proposed. Paper analyzed the influence of layer thickness, density, and number of layers on modulus back-calculation using finite numerical simulation experiments, and summarized the coefficient of modulus back-calculation parameters and calculation formulas. Experimental results show that road modulus back-calculation model based on equivalent stress diffusion can ensure the uniqueness of modulus calculation by solving the elastic modulus equation of pavement structural layers, and it presents good stability. Layer thickness and number of layers in the asphalt pavement structure cause huge influence on modulus back-calculation accuracy of surface layer module, while the effect on modulus back-calculation accuracy of base layer is relatively small. The average error between the back-calculation value and the theoretical value is between 9.71% to 15.93% and 5.68% to 11.32%, respectively. The soil subgrade is almost unaffected, and the average error of modulus back-calculation is less than 5%.

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Back-Calculation for Layer Modulus of Asphalt Pavement Based on Equivalent Stress Dispersion Method

  • 会议论文

  • 发表日期：

    2026年

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  • Long-jie Chen,
  • Lin-lin Xie,
  • Shou-jing Yan,
  • Cong Wang

摘要

To improve the back calculation stability of layer modulus in asphalt pavement and reduce miscalculation, a method based on equivalent stress diffusion for modulus back-calculation of road structural layer was proposed. Paper analyzed the influence of layer thickness, density, and number of layers on modulus back-calculation using finite numerical simulation experiments, and summarized the coefficient of modulus back-calculation parameters and calculation formulas. Experimental results show that road modulus back-calculation model based on equivalent stress diffusion can ensure the uniqueness of modulus calculation by solving the elastic modulus equation of pavement structural layers, and it presents good stability. Layer thickness and number of layers in the asphalt pavement structure cause huge influence on modulus back-calculation accuracy of surface layer module, while the effect on modulus back-calculation accuracy of base layer is relatively small. The average error between the back-calculation value and the theoretical value is between 9.71% to 15.93% and 5.68% to 11.32%, respectively. The soil subgrade is almost unaffected, and the average error of modulus back-calculation is less than 5%.