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water inrush
Hundreds of water inrush accidents have occurred and over 30 mines have been flooded, resulting in heavy economic losses and casualties.
      
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 and over 30 mines have been flooded over the last 20?years.
      
When the water pressure in the underlying aquifer exceeds Phf, a wedging effect takes place within the fractures of the geological barrier and, as a result, water inrush occurs.
      
Based on the test results, a new safety criterion for water inrush was derived for mines and it has been successfully applied to mining practices with the minimum effort of dewatering in the karst aquifer.
      
Water inrush and environmental impact of shallow seam mining
      
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.
      
GIS and ANN coupling model: an innovative approach to evaluate vulnerability of karst water inrush in coalmines of north China
      
Water inrush is controlled by geomorphology, regional geologic structure, and hydrogeologic conditions of the coalmines.
      
A geographic information system (GIS) was constructed to evaluate the vulnerability of the water inrush for coalmines in north China.
      
An artificial neural network (ANN) is used to determine the weight coefficient for each factor that affects the water inrush.
      
The mines of the Permo-Carboniferous coalfield in North China and the Late Permian coalfield in the South are seriously threatened with Karst Water from limestone, which results in frequent water inrush and mine inundation.
      
Study of Mine Water Inrush from Floor Strata through Faults
      
In China, most water inrushes occur from floor strata, the source of water inrush being karstic limestone aquifers.
      
This paper describes the mechanism of mine water inrushes through a fault in the mine floor using principles of strata mechanics, and the path of water inrush from an aquifer to the working face.
      
A criterion to judge whether the ground water inrush will occur through a fault or not is also described, together with a case history of water inflow in Feicheng Coalfield, China.
      
 

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