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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第9期    总第265期    2016年9月

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文章编号:1672-7207(2016)09-3201-07
颗粒级配对粗骨料充填料浆离析的影响
吴爱祥1, 2,王建栋1, 2,彭乃兵1, 2

(1. 北京科技大学 金属矿山高效开采与安全教育部重点实验室,北京,100083;
2. 北京科技大学 土木与环境工程学院,北京,100083
)

摘 要: 基于不合理的颗粒级配是粗骨料充填料浆发生离析的重要因素,以富勒公式为基础,建立平均粒径和粒径分散系数2个级配表征参数。基于魏茅斯干涉级配理论设计11种颗粒级配,并以此进行离析实验确定粒径分散系数的合理范围,利用云南某矿固体物料进行室内验证实验。研究结果表明:以屈服应力175~225 Pa、膏体料浆粒度低于20 μm颗粒质量分数为约束条件,可得当粗骨料充填料浆合理离析率为11.65%~14.53%时,其粒径分散系数K为1.43~1.45,平均粒径为1.89~2.00 mm;基于原级配的优化调整必要且有效;料浆质量分数为68%的G3和质量分数为70%的G2离析率测量值与合理离析率相比,误差分别为3.23%和5.75%,粗骨料充填料浆粒径分散系数和平均粒径的范围可靠、准确。

 

关键词: 颗粒级配;粗骨料;离析率;粒径分散系数

Effect of grain composition on coarse aggregate filling slurry segregation
WU Aixiang1, 2, WANG Jiandong1, 2, PENG Naibing1, 2

1. Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education,
University of Science and Technology Beijing, Beijing 100083, China;
2. School of Civil and Environmental Engineering, University of Science and Technology Beijing,
Beijing 100083, China

Abstract:Considering that unreasonable grain composition is an important factor of coarse aggregate filling slurry segregation, the representation parameters of gradation, i.e., average grain diameter and particle size distribution index, were established based on the Fuller formula. Eleven types of gradation based on Weymouth gradation theory were used for segregation test to study the range of particle size distribution index. Solid materials from a certain mine in Yunnan Province were used for verification test. The results show that, at constraint conditions, i.e. yield stress of 175-225 Pa and mass fraction of paste slurry with diameter of less than 20 μm, reasonable segregation rate of coarse aggregate filling slurry is from 11.65% to 14.53%. Particle size distribution index is from 1.43 to 1.45 and average grain diameter is from 1.89 mm to 2.00 mm. The optimization and adjustment of natural gradation is necessary and effective. Compared with reasonable segregation rate, the segregation rates of G3 with slurry mass fraction being 68% and G2 with 70% have a discrepancy of 3.23% and 5.75%, respectively. Hence, the ranges of particle size distribution index and average grain diameter determined in the paper are accurate and reliable.

 

Key words: grain composition; coarse aggregate; segregation rate; particle size distribution index

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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