工程地质学报2024，Vol.32Issue(6)：2130-2142,13.DOI:10.13544/j.cnki.jeg.2023-0341
基于离散元法的岩石颗粒破碎宏微观力学行为研究
MACRO-MICROMECHANICAL BEHAVIOR OF ROCK PARTICLE CRUSH-ING BASED ON DISCRETE ELEMENT METHOD
摘要
Abstract
Particle crushing in geomaterials,e.g.,soils or rock,is a theme of global focus due to its significant effect on the behavior of geomaterials.In order to investigate the intrinsic connection between the macroscopic and microscopic mechanical behavior of rock particle crushing,a number of uniaxial compression numerical tests of rock particles were carried out based on the discrete element method to investigate the macroscopic mechanical behavior of rock particle compression under different conditions(e.g.,loading rate,particle size,sub-particle bonding strength,and single-particle porosity).In this study,the rock particle crushing strength is revealed to increase with increasing loading rate or sub-particle bonding strength,but to decrease with increasing particle size or porosity.The macro-micromechanical behavior and mechanism of rock particle crushing were also investigated comprehen-sively by establishing the intrinsic linkage between the macro-mechanical behavior(e.g.,stress-strain behavior and particle crushing phenomenon)and micro-mechanism(e.g.,force-chain evolution,bond breakage,and micro-crack development)of rock particle crushing.In addition,by studying the energy conversion in the compression process of rock particles,it was found that the boundary energy was transformed into strain energy and dissipation energy during the rock particle crushing process with bond breakage and crack development.This study is valuable and helpful in understanding the macro and micromechanical behavior of rock particle crushing,which is of great signif-icance in guiding engineering practice.关键词
离散元法/岩石颗粒/压缩试验/颗粒破碎/宏微观力学行为Key words
Discrete element method/Rock particles/Compression tests/Particle crushing/Macro and micro be-havior分类
天文与地球科学引用本文复制引用
程威顺,余方威,雷震..基于离散元法的岩石颗粒破碎宏微观力学行为研究[J].工程地质学报,2024,32(6):2130-2142,13.基金项目
国家自然科学基金项目(资助号:U22A20603),四川省科技计划项目(资助号:2023ZYD0149),中国科学院人才计划——中国科学院西部之光青年学者项目(资助号:Fangwei Yu).This research is supported by the National Natural Science Foundation of China(Grant No.U22A20603),Sichuan Science and Technology Program China(Grant No.2023ZYD0149)and CAS"Light of West China"Program-China(Grant No.Fangwei Yu). （资助号:U22A20603）
