DEM analysis of crushing around driven piles in granular materials

摘要

Even though the simulations presented in this study assume many simplifications, such as a two-dimensional space, uniform dry circular particles, a low ratio of pile width to particle diameter, and a small percentage of gran- ular mass (16.7%) not considered in the analysis and assumed to migrate away from the pile, the results obtained agree, for the most part, with experimental results obtained by other researchers. A soil composed of weak granular particles presents smaller values of penetration resistance than a similar one composed of uncrushable particles. Particle crushing causes the production of particles of different sizes. Some of the particles remain in place, and some migrate away from the pile. Breakage and particle rearrangement were observed to induce stress relaxation, and caused the broken granular material to develop a lower resistance to pile penetration. It was found that the original DEM can be enhanced by including a simplified tensile failure criterion. Using this failure criterion, crushing around piles can be analysed and visualised.