Study On The Regular Evolution Of Water-flowing Fracture With Full-mechanized Caving Mining In Mindong No.1 Coal Mine

At present,the ecological environment and water resource protection is becoming one of the important indices for evaluation of mine sustainable development and advancement.Full-mechanized caving mining is widely used in mines because it can quickly convert coal resources into productive capacity.However,under the condition of full-mechanized caving mining,there were few studies on the development of the regular evolution of water-flowing fracture zone,and the development regular is not fully understood.Mindong No.1 coal mine located in northeast China has the shortage of water resources and low vegetation coverage.The regular evolution of water-flowing fracture and the impact of the ecological environment are unknown in this mine.Based on theoretical analysis,physical similarity simulation experiment,UDEC numerical simulation research and field engineering test,this paper carried out the study on the regular evolution of water-flowing fracture with full-mechanized caving mining in Mindong No.1 coal mine.Predicted the height of water-flowing fractured zone in Mindong No.1 mine using different theories is studied.Researching the new method to predict the height of water-flowing fractured zone by location of key strata.The height of water-flowing fractured zone and the occurrence probability of water inrush about each working face in first panel is predicted.Based on the 56-22 drill column,the height of water-flowing fractured zone is determined by physical similar simulation research.This result values the theoretical analysis and showing the theory based on predicted method for the height of fractured water-flowing zone by key strata location is feasible.The UDEC simulation software was adopted to study the factors affecting about the height,width,depth,overburden structure and the retention of coal pillar in combination with the geological conditions.Revealing the regular about evolution of water-flowing fracture zone with full-mechanized caving mining under the geological conditions.Carrying out research with field engineering measured.The development of primary fracture and the distribution of aquifers in the overlying strata was obtained through the observation of the leakage loss.The actual height of water-flowing fractured zone of the overlying strata was observed by the observation of the leakage of the flushing fluid through the hole drilled in the back hole.Finally,the maximum development height of water-flowing fractured zone in Mindong No.1 coal mine is 83.78 m.The development regular evolution of water-flowing fracture zone with full-mechanized caving mining in Mindong No.1 mine is preliminarily revealed,which provides guidance and reference for the subsequent working face mining.