ABSTRACT
Comparisons are made on horizontal and vertical subgrade reaction coefficients that are numerically obtained with modeling soil properties based on relevant triaxial test results on undisturbed or reconstituted samples of softrock, gravel, and clayey gravel. It is demonstrated that the dependency of the subgrade reaction coefficients on the loading width is affected by both the non-linearity and the pressure-level-dependency in the deformation properties of subsoil. Effects of the non-linearity appear in both the horizontal and the vertical subgrade reaction coefficients, when compared at the same displacement of the loading plate. On the other hand, effects of the pressure-level-dependency predominantly appear in the vertical ones. In the cases with subsoil of gravel and clayey gravel, combined effects of these factors result into apparent independency of the vertical subgrade reaction coefficients on the loading width.
