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Multi-fractal characteristics of particle size distribution of granular backfilling materials under different loads

  • Hao Yan , Jixiong Zhang , Jiaqi Wang , Nan Zhou and Sheng Zhang
Published/Copyright: July 3, 2018
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Materials Testing
From the journal Materials Testing Volume 60 Issue 2

Abstract

This study is focused on the inhomogeneity and local heterogeneity of the particle size distributions (PSD) of granular backfilling materials (eolian sands and loess) from western mines of China under overburden strata loads. The multi-fractal spectrum and variations in corresponding parameters of PSD of granular backfilling materials were obtained under different loads using a laser particle size analyzer and an environmental scanning electron microscope (ESEM). The results indicated that the load had negligible effects on the multi-fractal characteristics of PSD of eolian sand. There were no significant variations in the capacity dimension D(0), the information entropy dimension D(1) and the bandwidth of the multi-fractal spectra (Δα) as a function of the load. In contrast, the load significantly affected the multi-fractal characteristics of the PSD of loess, and D(0), D(1) and Δα increased and then decreased (maximized at 2 MPa) as the load increased. Furthermore, there was a correlation between structural morphology parameters and multi-fractal parameters in the particle breakage process, which demonstrated that D(0), D(1) and Δα of PSD of granular backfilling materials could effectively reflect the particle breakage and the change of structural morphology parameters of backfilling materials under different loads.

Kurzfassung

Die diesem Beitrag zugrundeliegende Studie konzentriert sich auf die Inhomogenität und die lokale Heterogenität von Partikelgrößenverteilungen (Particle Size Distributions (PSD)) von körnigen Verfüllmaterialien (Aeolische Sande und Löß) der westlichen Minen in China unter übergroßen Schichtbelastungen. Das multifraktale Spektrum und die Variationen der entsprechenden Parameter der PSD von körnigen Verfüllmaterialien wurden unter verschiedenen Lasten ermittelt, indem ein Laserpartikelgrößenmesser und ein Rasterelektronenmikroskop (ESEM) genutzt wurden. Die Ergebnisse deuten darauf hin, dass die Belastung einen vernachlässigbaren Effekt auf die multifraktalen Charakteristika der PSD von aeolischem Sand hat. Es ergaben sich keine signifikanten Variationen in der Kapazitätsdimension D(0), der Informationsentropiedimension D(1) und der Bandbreite der multfraktalen Spektren (Δα) als Funktion der Belastung. Im Gegensatz dazu wirkte sich die Belastung signifikant auf die multifraktalen Charakteristika der PSD von Löß aus, und D(0), D(1) und Δα nahmen zunächst zu und dann ab (mit einem Maximum bei 2 MPa), als die Belastung zunahm. Darüber hinaus bestand eine Korrelation zwischen den strukturellen Morphologie-Parametern und den multifraktalen Parametern im Prozess der Partikelbrechung, die zeigte, dass D(0), D(1) und Δαder PSD von körnigen Verfüllmaterialien die Partikelspaltung effektiv reflektieren können, ebenso wie die Veränderung der strukturellen Morphologie-Parameter von Verfüllmaterialien unter verschiedenen Belastungen.

*Correspondence Address, Prof. Dr. Jixiong Zhang, State Key Laboratory of Coal Resources and Safety Mining, China University of Mining & Technology, Xuzhou, Jiangsu 221116, P. R. China, E-mail:

Hao Yan, born in 1992, is a doctoral student of China University of Mining & Technolog in, Xuzhou, Jiangsu province. China. He obtained his Undergraduate degree in Mining Engineering from the same university in 2015. His primary research area is granular backfilling materials and rock mechanics.

Prof. Dr. Jixiong Zhang, born in 1974, is working at China University of Mining & Technology, Xuzhou, China. He obtained his Doctor degree in Engineering Mechanics from the same university in 2008. He was a visiting scholar at Southern Illinois Normal University, USA, from 2014 to 2015. His research interests are related to ground control, backfill mining and environmental protection in mining area.

Jiaqi Wang, born in 1993, is a master course student at China University of Mining & Technology, Xuzhou, China. His primary research area is geotechnical environmental engineering and backfill mining.

Assistant Prof. Dr. Nan Zhou, born in 1988, is working at China University of Mining & Technology, Xuzhou, China. He obtained his Doctor degree in Mining Engineering from the same university in 2014. His study focuses on ground control and backfill mining.

Sheng Zhang, born in 1995, is a master course student at China University of Mining & Technology, Xuzhou, China. His primary research area is granular backfilling materials and rock mechanics.

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Published Online: 2018-07-03
Published in Print: 2018-02-02

© 2018, Carl Hanser Verlag, München

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https://doi.org/10.3139/120.111127

Articles in the same Issue

  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. SteBLife – A new short-time procedure for the calculation of S-N curves and failure probabilities
  5. Surface treatment for effective bonding in the sports industry
  6. Effect of different rotational speeds on mechanical and metallurgical properties of friction welded dissimilar steels
  7. Comparison of titanium and FGM dental implants with different coating types
  8. Weld quality and productivity of AISI 4140 steel welded by unpulsed and pulsed GMAW
  9. Corrosion behavior of Hastelloy® C–4® Ni–Cr–Mo–Fe alloys for coal gasification syngas plants
  10. Application of FactSage® thermodynamic modeling for predicting the ash transformation with temperatures under partial slagging entrained flow coal gasification condition
  11. Röntgen- und Neutronentomographie am knöchernen Innenohr der Bartenwale
  12. Partial repair of thermally sprayed and sealed corrosion protection – Organic coating material or thermal spraying?
  13. Experimental study on solidification of Cu(II)-contaminated soil using red mud with cement and Ca(OH)2
  14. Tribological study of sintered iron based and copper based brake materials by pin-on-disc method
  15. Influence of drilling parameters on temperature and surface roughness of AISI O2 steel
  16. Multi-fractal characteristics of particle size distribution of granular backfilling materials under different loads
  17. Dry sliding behavior of aluminum alloy 8011 with 4 % fly ash
  18. Optimization of the milling parameters for an Al/Si3N4 functionally graded composite using grey relational analysis
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