Demonstration Project of Safe and Efficient Mining Operations in Extra-thick Coal Seam

doi:10.15302/J-FEM-2016040

Front. Eng

2016, Vol. 3

Issue (3) : 264-274 https://doi.org/10.15302/J-FEM-2016040

ENGINEERING MANAGEMENT REPORTS

Demonstration Project of Safe and Efficient Mining Operations in Extra-thick Coal Seam

Jin-hui Wang(

)

China Coal Technology & Engineering Group Corporation, Beijing 100013, China

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Abstract

Mineable coal reserves in thick and extra-thick seams account for 44% of the total deposit in China. Fully-mechanized top-coal caving technology is a new mining method of safe and efficient underground operations in extra-thick seams in China. The development of fully-mechanized top-coal caving technology in China, which was successfully applied in Face 8105 in Tashan Coal Mine, Datong, Shanxi, China, is analyzed in this paper. Studies on movement pattern of top-coal and roof from fully-mechanized top caving face in 14–20 m extra-thick seams have been carried out. A series of key technologies were successfully developed, including strata control technology, equipment for high-efficient and high-recovery top caving operations, and safety guarantee technology for low gas occurrence and high gas emission. As a result, the fully-mechanized top-coal caving Face 8105, with large mining height in Tashan Coal Mine, has achieved a recovery rate of 88.9% and an average equipment operation rate of 92.1%. With coal production of 10.84 Mt in 2011, the demonstration project is a technology and equipment breakthrough for fully-mechanized top-coal caving face in extra-thick coal seams with large mining height.

Keywords demonstration project extra-thick coal seam large mining height fully-mechanized top-coal caving recovery rate strata control safety guarantee

Corresponding Author(s): Jin-hui Wang

Online First Date: 25 October 2016 Issue Date: 22 December 2016

Cite this article:

Jin-hui Wang. Demonstration Project of Safe and Efficient Mining Operations in Extra-thick Coal Seam[J]. Front. Eng, 2016, 3(3): 264-274.

URL:

https://academic.hep.com.cn/fem/EN/10.15302/J-FEM-2016040
https://academic.hep.com.cn/fem/EN/Y2016/V3/I3/264

Fig.1 Coal rock strata histogram in Face 8105.

Fig.2 Coal rock strata structure of roof at Face 8105.

Fig.3 Roof structure model in LLTCC Face.

Fig.4 ZF15000/28/52 top-coal caving hydraulic support with a large supporting height.

Fig.5 Horizontal displacements of wall with different mining heights.

Fig.6 Structure of the second level wall guard plate installed on the extendable beam.

Fig.7 Boundary lines between coal and refuse with different step distance.

Fig.8 Forms of remaining top-coals with different step distance.

Fig.9 Large passage in the middle of support.

Fig.10 Gas concentration distributed along the directions of vertical height in the goaf and face advance.

Fig.11 Gas drainage in Face 8105.

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