Asphalt Pavement Structure Verification

Problem

During highway design, checking whether an asphalt pavement satisfies fatigue, rutting, and subgrade capacity usually follows JTG D50-2017. Manual lookups for equivalent axle loads, layer stresses and strains, and allowable values can become inconsistent, especially when reliability targets differ by road class. This skill turns that verification into an engineering workflow for four checks: asphalt layer fatigue cracking, cement-stabilized layer fatigue cracking, permanent deformation, and vertical compressive strain at the top of the subgrade.

How It Works And Limits

The skill follows an input parameters → specification-based calculation → pass/fail result pattern:
- Traffic inputs: AADTT, directional factor, lane factor, truck ratio, and growth rate are used to derive cumulative equivalent axle trips.
- Structure inputs: modulus, thickness, Poisson ratio, strength or stability for asphalt and base layers, plus subgrade resilient modulus.
- Verification output: it compares indicators such as Nf, Ra, and εz with specification limits and returns a pass/fail conclusion.
It is useful for option comparison, design review, and parameter sensitivity checks; project-specific tests, local supplementary rules, and material data still govern, and it does not replace formal design approval.