摘要
采用4种典型的颗粒形态各向异性材料开展一系列室内三轴力学特性试验,研究不同长宽比的散粒体材料在剪切过程中的强度与变形变化规律,结果表明,长宽比过大或过小对其抗剪强度以及颗粒破碎有较大影响。长宽比最大的散粒体材料强度最弱,但会因为颗粒较长,在剪切过程中发生弯折,出现明显的破碎;相反,长宽比最小的散粒体材料强度特别大,最大可达1 MPa,但最终会因为颗粒破碎的发生导致强度有所下降。长宽比的大小对内摩擦角也存在影响,二者存在反比关系,内摩擦角会随着长宽比的增大而减小。
A series of indoor triaxial mechanical tests were conducted on four types of materials with distinct particle shape anisotropies to investigate the variation in strength and deformation of granular materials with different aspect ratios during the shearing process.Results show that both excessively large and small aspect ratios have a significant impact on the material’s shear strength and particle breakage.The material with the largest aspect ratio exhibits the weakest strength;however,due to the elongated particles,noticeable particle breakage occurs as they bend during shearing.In contrast,the material with the smallest aspect ratio demonstrates exceptionally high strength,reaching approximately 1MPa,but eventually experiences a reduction in strength due to particle breakage.The size of the aspect ratio also influences the internal friction angle,with an inverse relationship;the internal friction angle decreases as the aspect ratio increases.
作者
熊健辉
李永强
陈波
刘旭锋
姬雪明
彭聪
XIONG Jianhui;LI Yongqiang;CHEN Bo;LIU Xufeng;JI Xueming;PENG Cong(School of Civil and Architecture Engineering,East China University of Technology,Nanchang 330013,China;Nanchang Emergency Management Bureau,Nanchang 330038,China)
出处
《福建理工大学学报》
2024年第6期527-534,541,共9页
JOURNAL OF FUJILAN UNIVERSITY OF TECHNOLOGY
基金
国家自然科学基金项目(52068002)
江西省“双千计划”项目(DHSQT32022006,JXSQ2020101041)
东华理工大学博士科研启动基金项目(DHBK2019245)。
关键词
长宽比
三轴剪切
散粒体
颗粒破碎
aspect ratio
triaxial shear
granular materials
particle breakage
