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An experimental investigation into the compaction characteristic of granulated gangue backfilling materials modified with binders

  • Baiyi Li
  • Feng Ju
Original Article

Abstract

Solid backfill mining has apparent technical advantages in extracting coal resource under sensitive surface structures such as buildings and roads; meanwhile, as an effective method of disposing mining wastes, it works well in solving some environmental problems caused by mining activities. In addition, the controlling effect of solid backfill mining is directly related to the compaction characteristic of backfilling materials. The present study aims to modify the backfilling materials by assessing the effect of binders (cement, fly ash, and lime) on the compaction characteristic of granulated gangue backfilling materials. The compaction test was performed with rock mechanic test system equipped with a self-made circular cylinder apparatus. From the results obtained, cement is not the suitable binder for modifying the gangues backfilling materials, while fly ash or lime, when the dosage is up to 20 wt%, is beneficial to the compaction characteristic of backfilling materials. The relationship between strain behavior and micro-structure of backfilling materials was investigated by SEM and the effect of fly ash or lime on the strain behavior of backfilling materials could be associated with its cementation and gap-filling effect.

Keywords

Solid backfill mining Granulated gangue Fly ash Compaction 

Notes

Acknowledgements

The authors would like to thank the staffs in the China University of Mining and Technology for the help in providing the test equipment. The authors also thank the financial support from the National Natural Science Foundation of China (No. 51674241).

Compliance with ethical standards

Conflict of interest

The authors declare that there is no conflict of interests regarding the publication of this paper.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory of Deep Coal Resource Mining, School of Mines, Ministry of Education of ChinaChine University of Mining and TechnologyXuzhouChina
  2. 2.Norman B. Keevil Institute of Mining Engineering, University of British ColumbiaVancouverCanada
  3. 3.State Key Laboratory for Geomechanics & Deep Underground EngineeringChina University of Mining & TechnologyXuzhouChina

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