Evaluation of Water Prevention and Control in Fault and Transformation Study of Coal Pillar's"Three Zones"
The 3500 track up mountain roadway in Liangbaosi Coal Mine excavates through faults.In order to ensure safe excavation,it is necessary to conduct water rich exploration and water prevention and control evaluation in the DF315 fault area.Through geophysical exploration,drilling,and safety evaluation of aquifers such as the three ash,tenlower ash,Ordovician ash and others on the roof and floor of the roadway,the DF315 water prevention and control coal pillar is converted into a gentle mining area.According to the results of geophysical exploration,drilling,and safety evaluation,it is showed that the water richness around the DF315 fault is weak and the fault does not conduct(contain)water.Under normal circumstances,there is no risk of water damage in fault communication aquifer exists.The actual waterproof layer thickness of aquifers such as floor three ash,tenlower ash,Ordovician ash and others are greater than the safe waterproof layer thickness.There is no aquifer within 45 m range of the roadway roof,the roadway excavation process will not be threatened by the above-mentioned aquifer water damage.According to the"Three Zones"management regulations,the DF315 fault coal pillar can be converted from a prohibited mining area to a gentle mining area.During the excavation of the 3500 track up mountain roadway,it is not threatened by water damage from the roof and floor aquifers and can safely and quickly pass through the DF315 fault.
fault coal pillarevaluation of water prevention and controlprohibited mining areagentle mining area
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