摘要
颗粒形状是颗粒形成历史的反映,是决定无粘性土强度特性的主要控制指标之一。为了研究颗粒形状对砂土力学性质的影响,选取6种不同形状的均粒径砂为研究对象,采用动态图像捕捉技术获取颗粒的数字图像,借助计算机数字图像处理系统进行二维数据提取并进行形状参数量化。提出了基于颗粒球度和磨圆度指标用来描述集合体颗粒形状的新的指标-形状系数ρ,结果表明,试样的极限孔隙比及压缩指数C均随着ρ的减小而增大;回弹指数C随着ρ的减小而减小;研究结果还表明,颗粒的破碎量随ρ的减小而增大,试样由级配不良向着良好方向发展。
The shape of particles reflects the history of particle formation and is one of the main control indices that determine the strength characteristics of cohesionless soils.To study the influence of the particle shape on the mechanical properties of sandy soils,A total of six(6)types of sand samples with different average particle sizes as well as different shapes are selected as the research object.The digital image of the particles is obtained by using the dynamic image capture technology,and the two-dimensional data are extracted by the computer digital image processing system and processed to quantify the shape parameter.A new shape factor(ρ)index from the particle sphericity and roundness indices to describe the shape of aggregate particles is proposed.The results show that the boundary void ratio and compressibility index(Cc)of the sample increase as(ρ)decreases.The rebound index(Cs)decreases with the decrease of(ρ);the experimental results also show that the number of particles breakage increases with the decrease of(ρ)and the sample develops from the poorly graded to the direction of well-graded.
作者
姜开放
朱长歧
马成昊
易明星
霍玉龙
JIANG Kaifang;ZHU Changqi;MA Chenghao;YI Mingxing;HUO Yulong(School of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004;Guangxi Key Laboratory of Rock and Soil Mechanics and Engineering,Guilin 541004;Wuhan Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071)
出处
《土工基础》
2022年第4期630-634,共5页
Soil Engineering and Foundation
基金
中国科学院战略性先导科技专项(A类)(No.XDA13010203)
国家自然科学基金面上項目(No.41877271,No.41572304)资助。
关键词
颗粒形状
动态图像
极限孔隙比
压缩指数
回弹指数
颗粒破碎
Particle Shape
Dynamic Image
Maximum and Minimum Void Ratio
Compressibility Index
Rebound Index
Particle Breakage
