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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 1    January 2020

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Quantitative investigation on micro-parameters of cemented paste backfill and its sensitivity analysis
LIU Lang(刘浪)1, 2, ZHOU Peng(周鹏)1, FENG Yan(冯岩)3, 4, ZHANG Bo(张波)1, SONG Ki-il(宋基一)5

1. Energy School, Xi’an University of Science and Technology, Xi’an 710054, China;
2. Key Laboratory of Western Mines and Hazards Prevention, Ministry of Education,
Xi’an 710054, China;
3. School of Resource and Safety Engineering, Central South University, Changsha 410083, China;
4. Division of Minerals and Metallurgical Engineering, Lule? University of Technology,
Lule? 97187, Sweden;
5. Department of Civil Engineering, Inha University, Incheon 402-751, Korea

Abstract:The mechanical properties of cemented paste backfill (CPB) depend heavily on its pore structural characteristics and micro-structural changes. In order to explore the variation mechanisms of macro-mechanical characteristics and micro-structure of CPB. CPB specimens with different mass concentrations prepared from the full tailings of Xianglushan Tungsten Ore were micro-tests. Moreover, acquired pore digital images were processed by using the pores (particles) and cracks analysis system (PCAS), and a sensitivity analysis was performed. The results show that as the mass concentration of CPB increases from 70% to 78%, the porosity, the average pore area and the number of pores drop overall, leading to a decline in the pores opening degree and enhancing the mechanical characteristics. As the mass concentration of CPB increases, the trend of fractal dimension, probability entropy and roundness is reduced, constant and increased, which can result in an enhancement of the uniformity, an unchanged directionality and more round pores. According to the definition of sensitivity, the sensitivities of various micro-parameters were calculated and can be ranked as porosity > average pore area > number of pores > roundness > fractal dimension > probability entropy.

 

Key words: cemented paste backfill; mass concentration; sensitivity analysis; micro-parameters

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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