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Nallala, Sarath Chandra Reddy
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document
Micromechanical insights on the stiffness of sands through grain-scale tests and DEM analyses
Abstract
The study of granular material behavior at multi-scales, i.e., macro, meso, and microscale through discrete element method (DEM) simulations calibrated with the macroscopic experimental data is the most common approach. However, this approach involves arbitrarily choosing the important particle contact parameters (density, contact normal and tangential stiffness, contact friction) used as input in DEM simulations which greatly affect the fabric formation and thereby influence the stress-strain response of granular materials. Therefore, a new micromechanical- based contact modeling approach is proposed in the present study where the particle contact properties are derived from micromechanical (grain-scale) tests (a range is suggested for normal contact stiffness and contact friction values) and are used as a reference for developing the DEM model.<br/>The DEM model analysis was implemented using a micromechanical-based contact modeling approach to assess the small-strain shear modulus (G<sub>max</sub>) behavior of sands. Multiscale insights were drawn while evaluating the influence of contact parameters such as particle Young’s modulus (E) and interparticle friction (μ) on the G<sub>max</sub> behavior of quartz sand. Additionally, the real sand grain contact characteristics evaluated using micromechanical tests along with the DEM analysis provided new insights into the roughness characteristics of granular materials.