Karst water control and management in the Hanxing mining area of North China |
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| Authors: | Z Wanfang |
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| Institution: | (1) P. E. LaMoreaux and Associates, Inc., 106 Administration Road, Oak Ridge, TN, 37830, USA, US |
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| Abstract: | The Hanxing mining area of North China includes three coalfields: Fengfeng, Handan and Xingtai. Six or seven coal seams can
be commercially mined in Permo-Carboniferous strata, among which the lower three, accounting for 37% of the total reserves,
are threatened with karst water from the underlain Ordovician limestone. Hundreds of water inrush accidents have occurred
and over 30 mines have been flooded, resulting in heavy economic losses and casualties. In order to avoid water inrushes and
keep the mines safely operational, dewatering in the karst aquifer was considered an essential measure. Unfortunately, this
practice has caused serious environmental problems such as surface subsidence (sinkhole), dry spring, and water supply shortage.
On the basis of a series of investigations and tests in the last 20 years, an alternative method, mining with water pressure,
has been proposed and is the main focus of this paper. By using this method, the karst water in the limestone can be preserved
to some extent and the coals can be mined in a relatively safe way.
Received: 22 March 1996 · Accepted: 8 April 1996 |
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| Keywords: | Karst water Coal mine Water inrush North China |
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