Effect of particle gradation characteristics on yield stress of cemented paste backfill

作     者：Hai-yong Cheng Shun-chuan Wu Xiao-qiang Zhang Ai-xiang Wu Hai-yong Cheng;Shun-chuan Wu;Xiao-qiang Zhang;Ai-xiang Wu

作者机构：Faculty of Land Resources EngineeringKunming University of Science and TechnologyKunming 650093China Key Laboratory of Ministry of Education of China for Efficient Mining and Safety of Metal MinesBeijing 100083China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2020年第27卷第1期

页      面：10-17页

核心收录：

学科分类：081902[工学-矿物加工工程] 0819[工学-矿业工程] 08[工学] 

基　　金：financially supported by China Postdoctoral Science Foundation (No. 2019M663576) the National Natural Science Foundation of China (No. 51774020) the Key Laboratory of Ministry of Education of China for Efficient Mining and Safety of Metal Mines (No. ustbmslab201801) the Program for Innovative Research Team (in Science and Technology) in University of Yunnan Province the Research Start-up Fund for Introduced Talent of Kunming University of Science and Technology (No. KKSY201821024) 

主　　题：paste backfill grading theory yield stress paste stability coefficient microscale 

摘      要：Along with slurry concentration and particle density,particle size distribution(PSD)of tailings also exerts a significant influence on the yield stress of cemented paste,a non-Newtonian *** this work,a paste stability coefficient(PSC)was proposed to characterize paste gradation and better reveal its connection to yield *** coefficient was proved beneficial to the construction of a unified rheological model,applicable to different materials in different mines,so as to promote the application of rheology in the pipeline transportation of *** the results,yield stress showed an exponential growth with increasing PSC,which reflected the proportion of solid particle concentration to the packing density of granular media in a unit volume of slurry,and could represent the properties of both slurry and granular *** was found that slurry of low PSC contained extensive pores,generally around 20μm,encouraging free flow of water,constituting a relatively low yield *** contrast,slurry of high PSC had a compact and quite stable honeycomb structure,with pore sizes generally5μm,causing the paste to overcome a higher yield stress to flow.