摘要
颗粒材料的破碎行为广泛地存在于各个领域内,且对散粒体材料的力学性能有较大影响。对颗粒破碎行为的大量研究皆建立在合理可靠的破碎率计算方法上。针对现有方法不能准确评估不规则形貌颗粒(以珊瑚砂砾为典型代表)破碎率的现状,提出了以颗粒体积作为基础参数的颗粒破碎率计算方法,对原有的基于颗粒粒径的Hardin破碎率计算公式进行了改进,可以更好地评估不规则颗粒破碎率。通过不同形状珊瑚砂砾的颗粒破碎试验,对上述理论公式进行了可靠性验证,进而分析了传统方法产生误差的原因。通过试验得出了不同形状颗粒在不同压力下、不同算法下的破碎率值。结合试验过程中的应力、变形和影像观测,获得了片状、块状、棒状3种不同形状珊瑚砂砾的颗粒破碎阈值,揭示了不同形貌颗粒随压力变化过程表现出的破碎模式演化特性。
The breakage behavior of granular materials is prevalent across various fields and significantly impacts the mechanical properties of granular materials.A substantial amount of research on particle breakage behavior relies on reasonable calculation methods for breakage rate.This article proposes a calculation method for particle breakage rate based on particle volume as the fundamental parameter,addressing the current limitation of existing methods in accurately evaluating the breakage rate of irregular particles,exemplified by coral gravel.It improves upon the existing Hardin breakage rate calculation formula,which is based on particle size,to better assess the breakage rate of irregular particles.Breakage tests of coral gravel with different shapes were designed and conducted to conduct reliability validation of the aforementioned theoretical formulas,and the causes of errors generated by traditional methods were analyzed.Through experiments,the breakage rate values of particles with different shapes under different pressures and algorithms were obtained.Meanwhile,combining stress,deformation,and image observations from the experimental process,the fragmentation thresholds of coral gravel in three shapes—sheet,block,and rod—were determined,revealing the evolution characteristics of fragmentation modes exhibited by particles with different morphologies during the pressure change process.
作者
王步雪岩
孟庆山
钱建固
WANG Bu-xue-yan;MENG Qing-shan;QIAN Jian-gu(Department of Geotechnical Engineering,Tongji University,Shanghai,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;College of Civil Engineering and Architecture,Guilin University of Technology,Guilin,Guangxi 541004,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2024年第7期1967-1975,共9页
Rock and Soil Mechanics
基金
中央高校基本科研业务费专项资金(No.2023-2-ZD-08)
国家自然科学基金(No.41877267)。
关键词
颗粒破碎
破碎率
珊瑚砂砾
particle breakage
breakage rate
coral sand
