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Minerals 2019, 9(1), 53;

Properties and Application of Backfill Materials in Coal Mines in China

State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China
School of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaide 5005, Australia
Author to whom correspondence should be addressed.
Received: 20 November 2018 / Revised: 25 December 2018 / Accepted: 9 January 2019 / Published: 17 January 2019
(This article belongs to the Special Issue Backfilling Materials for Underground Mining)
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Coal is the basic resource underpinning energy generation in China, however, constant, large-scale mining of coal results in many problems such as ecological destruction of mining areas. As a result, backfilling of solid waste underground is proposed to control strata and surface subsidence and to protect the environment. At present, these materials, such as granular material, cemented material and high-water-content materials are mainly used for backfilling. This study summarised the types of backfill materials that are used in coal mines in China along with the backfilling process. Moreover, distribution and characteristics of mines backfilled with these backfill materials were obtained and analysed. Considering the socio-environmental aspects that affect backfilling, this research proposed a guideline for the selection of backfill materials and then analysed specific engineering cases of three backfill materials. In addition, the future development of backfill materials was discussed. With extensive extraction of shallow coal resources in China and, therefore, rapid depletion of coal resources in eastern regions of China, coal mining depth is increasing significantly. As a result, it is required to investigate new backfill materials suited for the deep high-stress environment. View Full-Text
Keywords: backfill materials; coal mine; application status; backfill mining; subsidence control backfill materials; coal mine; application status; backfill mining; subsidence control

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Zhang, J.; Li, M.; Taheri, A.; Zhang, W.; Wu, Z.; Song, W. Properties and Application of Backfill Materials in Coal Mines in China. Minerals 2019, 9, 53.

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