Numerical Simulation on Water Inrush Process Due to Activation of Collapse Columns in Coal Seam Floor

摘要: In order to study the failure pattern of collapse columns and mechanism water inrush from coal seam floor,we simulated process due activation with full water-filling border using RFPA2D code.The numerical simulation duplicated whole forming macro conducting channels filling columns.The results show that formation pathway is affected by both physical characteristics mining induced stress disturbance,this particularly true during activity.Together hydraulic fracturing confined aquifer,shear deformation easy take place,making gradually activated,resulting in at last.