Study on Pavement Mechanics Analysis and Durability Assessment Considering Temperature Effect
DOI:
https://doi.org/10.13052/ejcm2642-2085.3421Keywords:
Stress strain, numerical simulation, temperature effect, subgrade pavementAbstract
Traditional design methods often overlook the temperature dependence of asphalt dynamic modulus, leading to frequent rutting in high-temperature zones and transverse cracking in low-temperature zones. To better understand the viscoelastic behavior of asphalt layers under temperature-load coupling, a time-varying dynamic modulus model was developed to enhance design accuracy. This study combines dynamic modulus tests (scanning at frequencies from 0.1 to 25 Hz) with finite element numerical simulations to create a temperature field model that accounts for the periodicity of solar radiation (modified Burgers, k, Duncan-Chang constitutive models). The model analyzes the effects of positive and negative temperature gradients (−30∘C to 55∘C) on structural stress and strain under static and dynamic loads. The findings indicate that increased temperature significantly reduces the dynamic modulus of the asphalt layer (by 10–30% at 55∘C), causing a 14.7-fold increase in shear strain in the positive temperature zone. Negative temperatures lead to a dramatic increase in subgrade tensile stress (reaching 12.1 times the initial value at −30∘C), and the presence of cracks increases shear stress concentration by 11.6%. Under dynamic loads, the dynamic modulus decreases by 54% at low temperatures, but the subgrade tensile stress remains 3.6 times above the standard limit. Theoretical work has established a three-dimensional response surface for temperature-frequency-modulus based on cubic spline interpolation. By constructing a dynamic modulus temperature correction coefficient matrix, the viscoelastic pavement time-varying mechanical model has been enhanced.
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