Predictive Stress Modeling of Resilient Modulus in Sandy Subgrade Soils

The mechanical properties of pavement materials are crucial to the design and performance flexible pavements. One most commonly used measures these is resilient modulus (Er). Many different models were developed predict coarse soils, which based on states stresses physical soil. unconsolidated unsaturated drained cyclic triaxial tests performed for three variously graded well-graded sand specimens determine modulus, perform predictive modeling using K-?, Rahim George, Uzan, Universal Witczak models. Obtained Er values directly depended confining pressure deviatoric stress during test. Octahedral Shear Stress (OSS) model, proposed by authors paper, predicts with a coefficient determination (R2) ranging from 0.85 0.99. advantage model use small-scale data tables, meaning fixed K1 K2 regression coefficients, it can be assigned specific specimen type without need them stresses.