The Coal Floor Water Bursting Risk Evaluation Of No.5 And No.9 Coal Seams At Tashan Coalmine

Aiming at the developing ordovician limestone aquifer of TaShan coalmine taiyuan group threating coalmine safety production,it is necessary to carry out TaShan coalmine coal seam floor water inrush risk evaluation of research work.On the TaShan coalmine based on the analysis of the geological condition,hydrogeological condition,through theoretical analysis,field measurement and numerical simulation,the geographic information system to evaluat the number 5,9 water inrush risk,the following conclusions:datong group and no.2 coal seam mining area water has a great threat to no.5 coal seam mining,so should timely when mining coal seam 5 mining area water discharge;No.5 coal seam of the effective thickness of water-resisting layer of 53.06-76.61 m,the water inrush coefficient value is still far less than the critical value,therefore,can be concluded that mining coal seam 5 general water inrush not happen;9 coal seam water inrush coefficient value near the fault close to the critical value,due to its close distance the ordovician limestone at the top,disturbance and the existence of fault and coal seam mining would further damage the integrity of the bottom plate,the actual water thickness will be smaller;Vulnerability index method is used to determine the no.9 coal seam in the eastern mining area of floor water inrush danger area,other areas of safety.