Impact of karst water on coal mining in North China |
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Authors: | Gongyu Li Wanfang Zhou |
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Institution: | (1) Central Coal Research institute Xian Branch, Institute of Hydrogeology and Engineering Geology, Xian, Shaanxi, 710054, China;(2) P.E. LaMoreaux and Associates, Inc., 106 Administration Road, Ste.4, Oak Ridge, TN 37830, USA |
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Abstract: | Coalfields in North China encompass more than ten Provinces. They contain six to seven coal seams in the Permo-Carboniferous
strata. The lower three seams account for 37% of the total reserves and are threatened with intrusion of karst water from
the underlying Ordovician limestone. Hundreds of water inrush incidences have occurred, in which a large amount of water suddenly
flows into tunnels or working faces under high potentiometric pressure. Over 50 mines have been flooded over the last 30 years.
Large-scale dewatering or depressurizing of the karst aquifer was considered essential to avoid water inrushes and keep the
mines safely operational. This practice, however, has caused sinkholes, dry springs, water supply shortage, and groundwater
contamination in the surrounding areas. One alternative water control measure is to make full use of the rock layer between
the coal seam and the karst aquifer as a protective barrier to prevent or constrain water flow from the underlying aquifer
into the mines. Grouting is effective when the hydrogeological conditions are favorable to this technique. Proper design of
the grouting program and experience of the contractor are also important for a successful application. |
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Keywords: | Coal mining Karst water Water inrush Dewatering Grouting North China |
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