<p>For the purpose of investigating the effect of particle roundness on the mechanical properties of coarse-grained materials, four specimen models with varying particle roundness were constructed through numerical simulation, ensuring that other particle shape parameters remained constant. Triaxial shear simulation tests were conducted under different confining pressure conditions, and the deterioration of material properties due to particle abrasion was further analyzed based on the simulation results. The findings indicate that in the natural piling state, sharp particles enhance the structural stability of the material, resulting in a larger angle of repose. Specimens with sharper particle morphologies generally exhibit higher strength and greater resistance to deformation. However, excessively sharp particles can reduce material strength. Under high-stress conditions, the influence of particle roundness on the mechanical properties of the material diminishes. Particle abrasion significantly weakens material strength, with increased abrasion depth leading to a gradual decline in strength. Higher confining pressure exacerbates the detrimental effect of particle abrasion on material performance.</p> Graphical Abstract <p></p>