Abstract

This study aims to advance the understanding of particle shape effects on the mechanical behaviours of granular materials by using 3D printed soil. A holistic particle geometry parameter (S_h), which integrated the 3D information of a particle (i.e. volume, surface area, and size) was developed to describe the particle shape and correlate with the granule’s shear behaviours. Test results revealed that higher S_h had positive correlations with the shear strength and dilation angle but exhibited negative correlations with packing densities. Under a constant relative density, particle shape showed coupled effects on the mechanical and volumetric behaviours of granular materials. The Regular Hexahedron (RH) granules exhibited the highest shear strength with the optimal shape parameter. In addition, an empirical correlation between S_h and maximum mobilised friction angle (ϕ_max) was established, which provided insights for discrete element method (DEM) simulations in considering the influences of particle shape.

摘要

本研究旨在通过使用 3D 打印土壤促进对颗粒形状对颗粒材料力学行为的影响的理解。开发了一个整体颗粒几何参数 (S _h )，它综合了颗粒的 3D 信息（即体积、表面积和尺寸）来描述颗粒形状并与颗粒的剪切行为相关联。测试结果表明，较高的 S _h与剪切强度和膨胀角呈正相关，但与堆积密度呈负相关。在恒定相对密度下，颗粒形状对颗粒材料的力学和体积行为表现出耦合效应。正六面体 (RH) 颗粒表现出最高的剪切强度和最佳的形状参数。此外，建立了 S _h与最大动员摩擦角 ( φ _max ) 之间的经验相关性，这为离散元法 (DEM) 模拟考虑颗粒形状的影响提供了见解。