Environmental impact of the technology for the development of high-power coal seams with a step-by-step arrangement of drifts

The article draws attention to the fact that in China the mining of thick coal seams is widely practiced, which leads to a negative impact on the environment of mining regions. With existing systems of mining, the using of pillars leads to uneven settlement and deformations of the earth’s surface. The article presents the results of research on the use of a new technology for the mining of thick coal seams with the use of a stepped layout of roadways to reduce the load on the environment. It is shown that in connection with a decrease in the size of the inter-main pillars, the nature of the displacement process changes, which is reflected in the sizes of the zones of collapse and cracks occuring. It also becomes possible to reduce the height of the zone of development of water-conducting cracks, which is important for the preservation of aquifers. On the example of the Huafeng mine, known for the anomalous of subsidence processes and the formation of extended cracks on the surface, the effectiveness of the proposed method is shown. The use of the new technology provides the localization of the crack development zone in the ductile rocks of the roof, which reduces the breaking deformations in the thick layer of the covering strong conglomerates and contributes to the formation of a smooth shear trough.

Keywords: mining of thick coal seams, staggered location of drifts, subsidence, subsidence zone, height of the crack development zone, green mining, aquifer, subsidence of the earth’s surface.
For citation:

Wang Zhiqiang, Qiao Jianyong, Su Zehua. Environmental impact of the technology for the development of high-power coal seams with a step-by-step arrangement of drifts. MIAB. Mining Inf. Anal. Bull. 2021;(2—1):30-39. [In Russ]. DOI: 10.25018/0236-1493-2021-21-0-30-39.

Acknowledgements:
Issue number: 2
Year: 2021
Page number: 30-39
ISBN: 0236-1493
UDK: 622.273
DOI: 10.25018/0236-1493-2021-21-0-30-39
Article receipt date: 21.12.2020
Date of review receipt: 15.01.2021
Date of the editorial board′s decision on the article′s publishing: 01.02.2021
About authors:

Wang Zhiqiang1, Doctor of Mining Engineering, Assistant Professor, e-mail: wzhiqianglhm@126.com;
Qiao Jianyong1,2, Dr. Sci. (Phys. Mathem.), Professor, Rector, Foreign Member of Russian Engineering Academy;
Su Zehua1, mining engineer;
1 China University of Mining and Technology (Beijing), Beijing, China;
2 Beijing University of Posts and Telecommunications, Beijing, China;

 

For contacts:

Wang Zhiqiang, e-mail: wzhiqianglhm@126.com.

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