Summary of water hazard characteristics and water prevention and control technology in open-pit coal mines in China

HUANG Xuanming1 ZHANG Yan1 LI Wensong2 TIAN Zenglin1

(1.Xi’an Research Institute Co., Ltd., China Coal Technology and Engineering Group Corp., Xi’an, Shaanxi Province, China 710077)
(2.Dayan Company of China Energy Investment Corporation, Hulun Buir, Inner Mongolia, China 021122)

【Abstract】Opencast mining is one of the two ways of coal mining in China. Similar to the underground coal mine, the open-pit coal mine also faces the problem of water prevention and control in the process of mining. Due to the relatively single type of water hazards in open-pit coal mines in China, domestic scholars have conducted in-depth study on the characteristics of water hazards and water control technology. In light of the distribution of open-pit coal mines in China, this paper analyzes the characteristics of water hazards in open-pit coal mines from three aspects of water filling sources, water filling channels and water filling intensity. It is concluded that atmospheric precipitation, surface water and shallow groundwater are the main water filling sources; direct channels formed by human excavation, strong permeable aquifer or permeable layer, vertical guide water drilling, surface cracks formed by landslide are the main water filling channels; obvious seasonal change, long drainage time and large quantity are the main characteristics of open-pit coal mine drainage. This paper sums up seven kinds of water control technologies commonly used in open-pit coal mines in China and puts forward a three-dimensional water control technology system from far to near, from top to bottom and from surface to point. From the perspective of groundwater resource and ecological environmental protection, the curtain closure technology aimed at cutting off supply channels and reducing the drainage of mines is the main method in the future in order to realize the green mining and sustainable development of open-pit coal mines.

【Keywords】 open-pit coal mines; water hazard; prevention and control technology; drainage; curtain closure;

【DOI】

【Funds】 National Key R&D Program of China (2017YFC0804106)

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(Translated by HAN R)

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This Article

ISSN:1001-1986

CN: 61-1155/P

Vol 48, No. 04, Pages 53-60

August 2020

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Article Outline

Abstract

  • 1 Distribution of open-pit coal mines in China
  • 2 Water hazards in open-pit coal mines
  • 3 Water control of open-pit coal mines
  • 4 Conclusion
  • References