Characterisation of rutting in unbound granular material of airfield pavements using time-dependent modified Drucker–Prager cap model.
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| Title: | Characterisation of rutting in unbound granular material of airfield pavements using time-dependent modified Drucker–Prager cap model. |
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| Authors: | Rahmani, Mohammad1 (AUTHOR) yong-rak.kim@tamu.edu, Kim, Yong-Rak1 (AUTHOR), Little, Dallas N.1 (AUTHOR), Rushing, John F.2 (AUTHOR) |
| Source: | International Journal of Pavement Engineering. Dec2025, Vol. 26 Issue 1, p1-18. 18p. |
| Subjects: | Pavements, Pavement design & construction, Deformations (Mechanics), Finite element method, Material plasticity, Granular materials |
| Abstract: | This study presents a mechanistic model simulation of rutting behaviour in the granular layers of airfield pavements using the time-dependent modified Drucker-Prager Cap (MDPC) model. The time-dependent MDPC is hypothesized as a constitutive model for predicting plastic deformation of granular materials with hardening compression. An efficient inverse optimisation approach is developed, integrating finite element analysis results with full-scale test data from a simulated airfield pavement exhibiting significant rutting in unbound layers. The algorithm calibrates the MDPC model to characterise permanent deformation in the granular base layer. Rutting data were obtained from the US Army Engineer Research and Development Centre (ERDC) full-scale tests. Results show that (1) the time-dependent MDPC model effectively predicts plastic deformation in pavement granular layers; (2) low cohesion values cause premature shear failure, low cap aspect ratios lead to early rutting saturation, and hardening parameters strongly influence rutting magnitude; and (3) the model's creep mechanism allows for characterising densification of material due to aggregate rearrangements under cyclic loading. This modelling and optimisation approach effectively identifies key material parameters governing permanent deformation in airfield pavements under repeated loading, providing valuable insights for advancement of pavement design and maintenance strategies for heavy-duty highways and airfields. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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