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Energies 2017, 10(8), 1209; https://doi.org/10.3390/en10081209

Reduction of Stress Acting on a Thick, Deep Coal Seam by Protective-Seam Mining

1
Key Laboratory of Deep Coal Resource Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, China
2
Datong Coal Mine Group Co. Ltd., Datong 037000, China
3
College of Civil and Architectural Engineering, Dalian University, Dalian 116622, China
*
Author to whom correspondence should be addressed.
Received: 20 June 2017 / Revised: 9 August 2017 / Accepted: 10 August 2017 / Published: 15 August 2017
(This article belongs to the Special Issue Energy Management Control)
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Abstract

Aiming to reduce the high mining stress observed in large-space roof structures during mechanized mining of thick coal seams, a control technique based on protective-seam mining is proposed. This technique was used to investigate the 8108 working face of the No. 3–5 thick coal seam of the Tashan mine located in the Datong area of Shanxi, China, by means of simulations and field measurements. The numerical simulation revealed that the No. 3–5 coal seam undergoes expansion and deformation, accompanied by stress relief due to the mining of the overlying No. 4 coal seam. The physical simulation demonstrated that mining the protective seam changes the structural characteristics of the overlying strata in advance and reduces the integrity of the roof in the No. 3–5 coal seam. Field measurements showed that the support loads in the 8108 working face are significantly weaker than those in the adjacent 8107 working face, where protective-seam mining was not performed. In the absence of high resistance on the support and distinct periodic weighting characteristics, the rock masses around the 8108 working face and roadway could be easily supported. View Full-Text
Keywords: protective coal seam; thick coal seam; over-mining; stress control; strata behavior protective coal seam; thick coal seam; over-mining; stress control; strata behavior
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Gao, R.; Yu, B.; Xia, H.; Duan, H. Reduction of Stress Acting on a Thick, Deep Coal Seam by Protective-Seam Mining. Energies 2017, 10, 1209.

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