Abstract

We look into the behaviour of tangential force-displacement between particles in a variety of granular materials. The focus of the work is on the microslip displacement, and the main tests are carried out utilising a specially constructed micromechanical loading equipment [1-15]. We demonstrate that the microslip displacement for each of the materials examined rises with the normal force, and that longer threshold displacements are seen for grains that are more uneven and softer. In order to provide an expression that may be employed in micromechanical-based analysis of problems involving geological materials, a previously proposed analytical expression is changed and given material micro-hardness in a normalised form.

Researchers' understanding of the complicated behaviour of granular materials, such as soils and fractured rocks, as well as the analysis of large-scale and multi-scale problems, has improved thanks to micromechanicalbased analyses.One of the widely used micromechanical-based computational tools in geomechanics research is the discrete element method a numerical tool that has grown significantly in popularity in recent decades. Studies exploring issues such as penetration the behaviour of railroad ballast and the mechanics of sand-silt mixtures have been undertaken using DEM or coupled FEM/DEM. giving significant new understandings into the intricate behaviour of granular materials. The behaviour of rocks and sandstone reservoirs weathering and erosion processes as well as the evolution of the micro-structure in particulate media have all been examined using DEM within a particle framework. Additionally, DEM has aided researchers in their exploration of geo-energy issues, such as the behaviour of soils that contain methane hydrates.