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

Wenhao Cao, Xufeng Wang, Peng Li, Dongsheng Zhang, Chundong Sun and Dongdong Qin
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Wenhao Cao: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Xufeng Wang: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Peng Li: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Dongsheng Zhang: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Chundong Sun: Jizhong Energy Handan Mining Industry Group, Handan 056002, China
Dongdong Qin: School of Mines, China University of Mining & Technology, Xuzhou 221116, China

Sustainability, 2018, vol. 10, issue 3, 1-16

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.

Keywords: critical mining; wide strip backfill mining; primary key strata; surface subsidence control; technical parameters; main influencing factors; wide filling strip width (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (9)

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