Particle breakage of sand subjected to friction and collision in drum tests

Journal of Rock Mechanics and Geotechnical Engineering

Chonglei Zhang¹  Qijun Xie²  Lijun Su³  Tao Zhao⁴  Fangwei Yu⁵  M. Qasim Jan⁵ 

[1] Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China;China-Pakistan Joint Research Center on Earth Sciences, CAS-HEC, Islamabad, 45320, Pakistan;Department of Civil Engineering, The University of Tokyo, Tokyo, 113-8656, Japan;University of Chinese Academy of Sciences, Beijing, 100049, China;Key Laboratory of Mountain Hazards and Earth Surface Process of CAS, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China;

关键词: Grain size distribution;    Drum tests;    Granular flow;    Particle breakage;   

DOI  :  

来源: DOAJ

【 摘 要 】

This paper presents a laboratory experimental study on particle breakage of sand subjected to friction and collision, by a number of drum tests on granular materials (silica sand No. 3 and ceramic balls) to investigate the characteristics of particle breakage and its effect on the characteristics of grain size distribution of sand. Particle breakage increased in up convexity with increasing duration of drum tests, but increased linearly with increasing number of balls. Particle breakage showed an increase, followed by a decrease while increasing the amount of sand. There may be existence of a characteristic amount of sand causing a maximum particle breakage. Friction tests caused much less particle breakage than collision tests did. Friction and collision resulted in different mechanisms of particle breakage, mainly by abrasion for friction and by splitting for collision. The fines content increased with increasing relative breakage. Particle breakage in the friction tests (abrasion) resulted in a sharper increase but with a smaller total amount of fines content in comparison with that in the collision tests (splitting). For the collision tests, the fines content showed a decrease followed by an increase as the amount of sand increased, whereas it increased in up convexity with increasing number of balls. The characteristic grain sizes D10 and D30 decreased in down convexity with increasing relative breakage, which could be described by a natural exponential function. However, the characteristic grain sizes D50 and D60 decreased linearly while increasing the relative breakage. In addition, the coefficients of uniformity and curvature of sand showed an increase followed by a decrease while increasing the relative breakage.

【 授权许可】

Unknown