Characterization of coal-mine refuse as backfilling material

Karfakis, Mario G.; Bowman, Charles H.; Topuz, E.

doi:10.1007/bf00430273

Cited by 55 publications

(35 citation statements)

References 6 publications

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“…Although gob backfill is also called complete backfill, none of backfill techniques can obtain a filling ratio of 100 %. This is attributed not only to backfilling process and mechanical properties of backfill material (Karfakis et al 1996), but also to the mining-induced motion law of roof strata. The filling ratio of \100 % has been confirmed by practices of mining with backfill in different countries (Gandhe et al 2005).…”

Section: Mining-induced Surface Subsidence Using Complete Backfillmentioning

confidence: 99%

“…By contrast, the compactness of waste rock is relatively low, and surface subsidence control effect is not as good as paste backfill. Karfakis et al (1996) concluded that if improving ground control is the only reason for backfilling, coal refuse alone does not appear to be a suitable stowing material. The control effect of HWMB is between the other two.…”

Section: Mining-induced Surface Subsidence Using Complete Backfillmentioning

confidence: 99%

“…In the coal mining industry worldwide, the primary and common purpose of applying backfill is to mitigate surface subsidence and thus to mine under surface structures (the most cases), rivers and railways, etc. (Palarski 1989(Palarski , 2004Karfakis et al 1996;Ilgner 2000;Xu et al 2004;Lokhande et al 2005;Miao et al 2010;Xuan et al 2013;Xuan and Xu 2014). In underground coal mines, surface subsidence induced by different mining methods are very different.…”

Section: Introductionmentioning

confidence: 99%

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Innovative backfilling longwall panel layout for better subsidence control effect—separating adjacent subcritical panels with pillars

Xuan

2014

Int J Coal Sci Technol

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In recent years, field trials of non-pillar longwall mining using complete backfill have been implemented successively in the Chinese coal mining industry. The objective of this paper is to get a scientific understanding of surface subsidence control effect using such techniques. It begins with a brief overview on complete backfill methods primarily used in China, followed by an analysis of collected subsidence factors under mining with complete backfill. It is concluded that non-pillar longwall panel layout cannot protect surface structures against damages at a relatively large mining height, even though complete backfill is conducted. In such cases, separated longwall panel layout should be applied, i.e., panel width should be subcritical and stable coal pillars should be left between the adjacent panels. The proposed method takes the principles of subcritical extraction and partial extraction; in conjunction with gob backfilling, surface subsidence can be effectively mitigated, thus protecting surface buildings against mining-induced damage. A general design principle and method of separated panel layout have also been proposed.

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Section: Mining-induced Surface Subsidence Using Complete Backfillmentioning

confidence: 99%

Section: Mining-induced Surface Subsidence Using Complete Backfillmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Innovative backfilling longwall panel layout for better subsidence control effect—separating adjacent subcritical panels with pillars

Xuan

2014

Int J Coal Sci Technol

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“…In addition to the common concerns of air pollution and greenhouse gas emission which are caused by coal combustion, the underground coal mining process causes more serious and permanent destruction, including land resource subsidence and occupation, water resource loss and pollution, air pollution, as well as ecological damage and degradation [1,2,4,[7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…In the 1990s, paste backfilling and full gangue cementation methods were developed. In paste backfilling material, the concentration of aggregate material (gangue, sand) can be 50%, and the cementing agent (cement or speed coagulation material) concentration is about 20% [2,[8][9][10][11]. Recently, paste cement backfilling technology has been developed with pilot facility applied in Chinese coal mines, which has achieved control of goaf roof caving and surface subsidence [2,5,[30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Green and Sustainable Mining: Underground Coal Mine Fully Mechanized Solid Dense Stowing-Mining Method

et al. 2017

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China produces and consumes most of coal in the world. This situation is expected to continue within a certain period in the future. Currently, Chinese coal industry is confronted with several serious problems relating to land resource, water resource, environmental, and ecological sustainability. Coal resource exploitation causes the permanent fracture and movement of strata structure, which have caused the fracture and collapse of overlying strata and further led to the subsidence of ground surface as well as the seepage of water in aquifers around the coal seam, which has resulted not only in the loss of land and water resources, but also in serious threats and accidents to underground mining. On the other hand, mining and mineral-processing wastes are one of the world's long plagued concerns among solid wastes. Coal gangue, as the major waste with a huge amount of discharge, has not only occupied the land, but has also contaminated the ambient land resources and hydrological environment, and further led to ecological system destruction and degradation. What is more, in China there are large amounts of coal-located under railways, buildings, and water bodies-which are unavailable with traditional mining methods. These problems are obviously threaten the concept of green sustainable development. This paper introduces a novel developed solid dense stowing mining method, which is able to significantly reduce or event eliminate the corresponding damages caused by underground mining behavior and realize green and sustainable development. The novelty of this research work is realizing the automation and synchronization of mining and material stowing with an appropriate compaction ratio for adequate support of goaf roof. It can improve the stability of rock strata and the safety and efficiency of underground mining. We also studied and designed a perfect stowing material by using coal gangue and fly ash with appropriate proportions under different particle size gradations. By implementation of the above-mentioned methods in China, the solid dense stowing rate of mined seam areas have reached more than 95% and the overburden strata movements have been reduced to extremely low level which had nearly no damages to above buildings. The solid dense stowing mining method has also realized the reuse and recycling of coal mine solid wastes. Meanwhile, considerable previously unavailable coal resources under buildings, railways, and water bodies have been made available for exploration, which could extend the life of coal mines and increase the sustainability for coal industry and the environment. Ultimately, this method is a reliable way to realize green and sustainable mining. The strata structure protection, the surface subsidence prevention, and coal mine solid waste disposal have been realized at the same time.

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Impact Energy Absorption Behavior of Cemented Coal Gangue-Fly Ash Backfill

Liu

Zheng

et al. 2015

Geotech Geol Eng

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Characterization of coal-mine refuse as backfilling material

Cited by 55 publications

References 6 publications

Innovative backfilling longwall panel layout for better subsidence control effect—separating adjacent subcritical panels with pillars

Innovative backfilling longwall panel layout for better subsidence control effect—separating adjacent subcritical panels with pillars

Green and Sustainable Mining: Underground Coal Mine Fully Mechanized Solid Dense Stowing-Mining Method

Impact Energy Absorption Behavior of Cemented Coal Gangue-Fly Ash Backfill

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