摘要
为了了解土石混合体的破坏机理及其力学性能,借助于PFC数值模拟试验,研究了土石混合体的剪切特性,包括不同颗粒级配组粒径质量分数、颗粒的缺失、模型尺寸3个因素对剪切强度的影响。研究结果表明:(1)细颗粒含量对模型剪切强度的大小起到至关重要的作用,细颗粒含量越大,模型的剪切强度就会越大;反之,则越小。(2)细颗粒的粒径质量分数为85%是区分剪切应力-剪切位移关系曲线是否明显波动的分界点。(3)模型剪切强度与模型面积之间存在负相关关系,而且细颗粒的粒径质量分数越小,模型尺寸效应与剪切强度的相关性就越强。
In order to understand the failure mechanism and mechanical properties of soil-rock mixture, the shear characteristics of soil-rock mixture were studied by PFC numerical simulation test, mainly including the influence of particle size mass fraction of different particle gradations, particle loss and model size on shear strength.The results showed that the amount of fine particles played a vital role to shear strength in the model test.The greater the fine particle content, the greater the shear strength of the model, otherwise the opposite.The particle size mass fraction of fine particles of 85% was an obvious boundary point to distinguish the jump of the shear stress-shear displacement curve.There was a negative correlation between the model shear strength and the model area, and the smaller the mass fraction of fine particles, the stronger the correlation between the model size effect and the shear strength.
作者
谷东京
李建林
黄宜胜
GU Dongjing;LI Jianlin;HUANG Yisheng(College of Hydraulic and Environmental Engineering,China Three Gorges University,Yichang 443002,China)
出处
《人民长江》
北大核心
2022年第7期193-200,共8页
Yangtze River
基金
国家自然科学基金重点项目(51439003)
三峡库区地质灾害教育部重点实验室开放基金项目(2018KDZ09)。
