Construction of"L-type"drainage system and its application in prevention and control of water in loose layers
Mine water inrush is always a safety hazard in mine production,especially for the water in the roof loose aquifer.Not being handled properly,it may cause water and sand inrush.In order to ensure the safe mining of coal seams under the loose aquifer of thin bedrock in the study area,it is an effective method to drainage or dewatering the aquifer water,but the underground drainage cannot be successfully implemented due to the collapse of the loose aquifer.Taking Zhaojiazhai Coal Mine as an example,through the construction of"L-type"roof water drainage system,the overlying Neogene loose aquifer water was converted from roof water to floor water and dis-charged from underground roadway,which solved the problem of coal seam fully-mechanized mining under thin bedrock and thick loose aquifer,and realized the safe mining of working face.The successful application of this technology has promotion value for coal seam mining under similar hydrogeological conditions.
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