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- W1852652017 abstract "Current mechanistic-empirical airport pavement design procedures use Elastic Layer Programs (ELP) to predict pavement responses (deflections, stresses, strains) generated by the gear load. The procedures incorporate subgrade strain criteria for controlling pavement rutting. WES/CE/FAA and AI vertical compressive strain criteria were developed from ELP analyses of pavement sections per the revised CBR equation. The limited scope of pavement test sections and performance data required extrapolation of other subgrade, loading and climatic conditions. The large and varying rutting criteria used to interpret the test section performance data are not consistent with the more rigorous criteria generally associated with high type airport pavements. A subgrade stress ratio (SSR = repeated deviator stress/soil strength) approach is presented. The University of Illinois (U of IL) SSR criteria ensure the pavement exhibits stable permanent deformation performance. Subgrade rutting is controlled by limiting SSR to acceptable levels, depending on traffic. The WES/CE/FAA strain criteria expressed in SSR terms are below about 0.4. These SSRs are very conservative and result in increased pavement thickness. Permissible SSRs for airport subgrades are probably in the range of 0.5 to 0.7. Load pulse characteristics (stress level and duration) of multiple-wheel gear configurations and stress history effects (subsequent of stress level applications) on subgrade permanent deformation accumulation need to be further considered in implementing the SSR concept." @default.
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- W1852652017 date "1997-01-01" @default.
- W1852652017 modified "2023-09-27" @default.
- W1852652017 title "Subgrade Criteria for Airport Flexible Pavement Design" @default.
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