Research conducted as part of the NSF project “CPT Based Characterization of Intermediate Soils” that aims to develop a mechanics based framework which synthesizes results of numerical simulations and laboratory tests, to stablish relationships between cone penetration resistance and monotonic and cyclic strengths of intermediate soils. Investigated the evaluation of the effects of the inclusion of non-plastic fines into dry Nevada sand specimens in their one-dimensional compression characteristics, and the evaluation of the effects of the inclusion of plastic fines in the one-dimensional compression characteristics of silica flour. Evaluating the index properties, permeability, one-dimensional compression and undrained Direct Simple Shear (monotonic, cyclic, cyclic pre-strain history) characteristics of Ottawa sand F-65, and using PM4Sand constitutive model to model experimental DSS test results in FLAC 2D (Itasca, 2011). All the results contributed to a better understanding of the mechanical behavior of these materials under the mentioned conditions. Results are currently in use to calibrate the MIT-S1 constitutive model to simulate the CPT cone penetration process in a numerical model in FLAC 2D by others. Experimental results are currently in use to validate centrifuge experimental results conducted by other PhD student. Additionally, the results on Ottawa sand F-65 will be used for future centrifuge modelling for earthquake engineering research, as part of the Liquefaction Experiment and Analysis Project (LEAP).