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Minerals 2017, 7(4), 63; doi:10.3390/min7040063

Characteristics of Strata Behavior during Thick Seam Mining by Fully-Mechanized Top Coal Caving in a Loess-Covered Gullied Region

1
School of Mines, China University of Mining & Technology, Xuzhou 221116, China
2
The Laboratory of Mining-Induced Seismicity Monitoring in Jiangsu Province, 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
School of Mining Engineering, University of New South Wales, Sydney, NSW 2052, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Saiied Aminossadati
Received: 22 March 2017 / Revised: 16 April 2017 / Accepted: 19 April 2017 / Published: 24 April 2017
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Abstract

This study systematically investigates the overburden movement and strata behavior at a fully-mechanized top coal caving (FMTCC) face in a thick coal seam in a loess-covered gullied region by field measurement and theoretical analysis. A comparative analysis was performed to examine how the attitude of surface gullies and the structure of overburden affect face support resistance. The characteristics and evolution mechanism of strata behavior during FMTCC under gully slopes in a loess-covered gullied region were discovered through a mechanical analysis of the roof structure and a comparison to the mining of a typical shallow seam under gully slopes. The study found that as the FMTCC face advanced, the strata behavior initiated in the middle part of the face and then continued to both ends, and its intensity was higher in the middle part than in the upper and lower parts. During mining under gullies, the increases in support resistance were generally less than 5% (except for the maximum increases of 7–9%), indicating that the occurrence of gullies on the surface had little influence on the strata behavior at the FMTCC face. Due to the increased burial depth and the number of key strata, the roof at the FMTCC face under gullies formed a stable load-bearing structure called a voussoir beam, which was the key difference from the strata behavior characteristics in the shallow mine under gullies. View Full-Text
Keywords: loess-covered gullied region; thick coal seam; FMTCC face; strata behavior; roof structure loess-covered gullied region; thick coal seam; FMTCC face; strata behavior; roof structure
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Wang, X.-F.; Wang, Y.; Zhang, D.-S.; Wang, H.-Z.; Zhang, Y.; Qin, D.; Zhang, C. Characteristics of Strata Behavior during Thick Seam Mining by Fully-Mechanized Top Coal Caving in a Loess-Covered Gullied Region. Minerals 2017, 7, 63.

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