摘要
火山渣颗粒具有形状不规则、棱角较多的特点,其形状特征会影响材料工程性质.为探究火山渣颗粒形状特性,通过AIMS集料图像测量系统获得火山渣颗粒图像以及形状指标,采用分形维数和正态分布检验方法,讨论以颗粒长度作为特征粒径时粒径变化对颗粒形状和分形维数的影响规律,并对比火山渣颗粒与一般岩体颗粒的形状差异.结果表明:随着特征粒径减小,火山渣颗粒长扁度和粗糙度逐渐减小,棱角度、球度和分形维数逐渐增大,越趋近于球形和块状,且表面棱角越少.所有采用的形状指标之间均有较好的相关性,其中棱角度对特征粒径变化最为敏感,可优先选取棱角度作为描述火山渣形状的指标.此外,通过与卵石和级配碎石的对比表明,在不同粒径范围内,火山渣颗粒长扁度和圆度随粒径变化不如卵石和级配碎石显著,且火山渣粗糙度和棱角度均比卵石和级配碎石大,表明火山渣颗粒棱角更多,表面更粗糙.
The volcanic cinder has the characteristics of irregular shape and sharper angles,and its shape char-acteristics affect the material engineering properties.In order to explore the shape of volcanic cinder particles,the im-age and shape index of volcanic cinder were obtained by AIMS aggregate image measurement system.The fractal di-mension and normal distribution method were used to discuss the influence of fractal dimension and shape as the par-ticle size change on the particle shape and fractural dimension.The differences in shape between the volcanic cinder and general rock mass were also investigated.The results show that as the particle size decreases,the elongation and texture decrease,the angularity,sphericity and fractal dimension increase,the volcanic cinder approaches spherical and massive,and the surface angularity is reduced.All the shape indicators have a good correlation,and the angularity is the most sensitive to the change of the particle size.Thus,it can be preferentially selected to describe the shape of the volcanic cinder.In addition,comparison with pebbles and crushed stone shows that the change of volcanic cinder elongation and texture is not as significant as that of the pebbles and crushed stone under different particle size.More-over,the texture and angularity of volcanic cinder are larger than those of pebbles and crushed stone,indicating that the volcanic cinder has more angular edges and a rougher surface.
作者
聂志红
廖靖云
周苏华
李冰晓
安爱军
NIE Zhihong;LIAO Jingyun;ZHOU Suhua;LI Bingxiao;AN Aijun(School of Civil Engineering,Central South University,Changsha 410075,China;College of Civil Engineering,Hunan University,Changsha 410082,China;School of Mathematics and Statistics,Central South University,Changsha 410075,China;China Road and Bridge Corporation,Beijing 100000,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第3期131-139,共9页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(51478481,51708199)
北京市科技计划课题(Z181100003918005)
中南大学中央高校基本科研业务费专项资金资助(2018zzts655)。
关键词
火山渣
分形维数
长扁度
棱角度
球度
粗糙度
volcanic cinder
fractal dimension
elongation
angularity
sphericity
texture
