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Energies 2018, 11(1), 102; https://doi.org/10.3390/en11010102

Influence of Spatial Relationships between Key Strata on the Height of Mining-Induced Fracture Zone: A Case Study of Thick Coal Seam Mining

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
*
Author to whom correspondence should be addressed.
Received: 14 December 2017 / Revised: 31 December 2017 / Accepted: 2 January 2018 / Published: 3 January 2018
(This article belongs to the Section Energy Sources)
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Abstract

The behavior of the overburden of working face 20104 at the Wangjialing coal mine was investigated using borehole imaging. The measured height of the conductive fracture zone (CFZ) in the overburden, 148 m, is significantly different from the height that is predicted by an empirical formula. The spatial relationships between key strata (KS) required for their fracturing and their influence on the CFZ’s height were analyzed. The results demonstrate that the spatial relationships between adjacent KS are a major factor behind the abnormal increase in the height of CFZ relative to the coal seam. The height of linkage (HoL) between KS was introduced and an equation for calculating this height was proposed. The study found that the fracturing of a KS could induce fracturing of the adjacent KS above it if their height difference was smaller than the HoL between them. Otherwise, the fractures resulting from the lower KS would terminate at the bottom of the higher KS. When the location of a high KS satisfies certain requirement, the spatial linkage between adjacent KS will allow for the conductive fractures arising in a lower KS to propagate through the high KS as well as the strata controlled by it, thus increasing the height of CFZ in overburden. View Full-Text
Keywords: field measurements; thick seam mining; mining-induced fractures; key strata field measurements; thick seam mining; mining-induced fractures; key strata
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Li, P.; Wang, X.; Cao, W.; Zhang, D.; Qin, D.; Wang, H. Influence of Spatial Relationships between Key Strata on the Height of Mining-Induced Fracture Zone: A Case Study of Thick Coal Seam Mining. Energies 2018, 11, 102.

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