Abstract
The relatively complex hydrogeology of Karst aquifers is often detrimental to mine production. Through experience, China has developed several different methods to control such mine water inflows. Selection of a method should be directed towards controlling the effects of prominent hydrogeological characteristics in different Karst types. For Karst, surface water flows, water cutoff ditches and subsequent diversion trenches are used. For ground water flows in semi-confined aquifers, drainage by deep wells and combinations of special water cutoff drifts and pre-drainage by galleries are used. In addition, in confined aquifers such techniques as combined of methods surface and underground water control, including multiple depressurising wells and water sealing wall operations are used.
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