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Sustainability 2018, 10(3), 700; https://doi.org/10.3390/su10030700

Wide Strip Backfill Mining for Surface Subsidence Control and Its Application in Critical Mining Conditions of a Coal Mine

1
School of Mines, China University of Mining & Technology, Xuzhou 221116, China
2
The Jiangsu Laboratory of Mining-Induced Seismicity Monitoring, China University of Mining & Technology, Xuzhou 221116, China
3
Key Laboratory of Deep Coal Resource Mining, China University of Mining & Technology, Xuzhou 221116, China
4
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou 221116, China
5
Jizhong Energy Handan Mining Industry Group, Handan 056002, China
*
Author to whom correspondence should be addressed.
Received: 31 December 2017 / Revised: 18 February 2018 / Accepted: 1 March 2018 / Published: 5 March 2018
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Abstract

Critical mining under buildings, railways, and water bodies (BRW) brings the contradiction between high recovery rate and minor environmental hazards. To lessen this contradiction, an innovative mining method referred to as “wide strip backfill mining” (WSBM) was proposed in this study. A Winkler beam model is applied to the primary key strata (PKS), and the study revealed a surface subsidence control mechanism and designed the technical parameters of the method. The respective numerical simulations suggested the feasibility of the proposed method and the main influencing factors on surface subsidence can be ranked in descending order as wide filling strip width (WFSW), filling ratio, and pillar width. Meanwhile, a drop in the WFSW from 96 m to 72 m brought out the surface subsidence reduction by 44.5%. By using the super-high water content filling material, the proposed method was applied in the Taoyi coal mine under critical mining conditions. The resulting surface subsidence and deformations met the safety requirements for building protection level 1, and the recovery rate reached 75.9%. Moreover, the application of the method achieved significant technical and economic benefits. The research can provide a theoretical and experimental substantiation for critical mining under BRW. View Full-Text
Keywords: critical mining; wide strip backfill mining; primary key strata; surface subsidence control; technical parameters; main influencing factors; wide filling strip width critical mining; wide strip backfill mining; primary key strata; surface subsidence control; technical parameters; main influencing factors; wide filling strip width
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Cao, W.; Wang, X.; Li, P.; Zhang, D.; Sun, C.; Qin, D. Wide Strip Backfill Mining for Surface Subsidence Control and Its Application in Critical Mining Conditions of a Coal Mine. Sustainability 2018, 10, 700.

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