To properly model the subgrade soil responses under dynamic loads, permanent deformation and damping characteristics must be studied in addition to the subgrade resilient modulus. Soils having relatively high resilient modulus may or may not have small permanent strains (epsilon(p)) and low damping characteristics (xi). Therefore, in addition to the resilient modulus (M-R), permanent deformation and damping characteristics also need to be studied for undisturbed subgrade soils to replicate field conditions under cyclic loading properly. This study correlates permanent strain and damping information with resilient modulus testing for undisturbed subgrade soils. For this study, 76 Shelby tube samples of subgrade soils were collected from existing pavements in three different regions: SC-93 in Pickens County (Upstate Area), US-521 in Georgetown County (Coastal Plain), and US-321 in Orangeburg County (Coastal Plain, near the fall line). Statistical models were developed to correlate resilient modulus (k(1), k(2), k(3)), permanent strain (alpha(1), alpha(2), alpha(3), alpha(4)), and damping model parameters (beta(1), beta(2), beta(3)) with soil index properties for undisturbed soils. Models were also developed to correlate epsilon(p) and xi with subgrade soils M-R.

来源平台：GEO-CONGRESS 2024-GEOTECHNICAL SYSTEMS