Mining Effect And Influencing Factors Of Fault Activation Water Inrush Above Confined Aquifers

Mine water disaster is a serious threat to coal mine safety production.With the increase of mining depth and mining intensity,the threat of the Ordovician limestone karst water is more and more serious.Therefore,it is necessary to study the mechanism and influencing factors of the activated water inrush in the confined water.In this paper,theoretical analysis,numerical simulation,combined with the field of geophysical prospecting methods,the study on the process of water inrush and its influencing factors in the mining face of the confined water:(1)On the basis of the mine pressure and strata control theory,the establishment of mining on the confined water inrush through fault of hydraulic model,deduced the mining mechanics criterion of fault activation,activation of critical inclination;based on the limit equilibrium theory of rock mass,are on the confined water of mining water inrush through fault critical pressure calculation formula,analysis of fault dip,fault(fault in mechanical properties the friction angle and cohesion force),gob hanging roof working face to the distance,fault distance,floor strata thickness(complete rock band)influences the critical water pressure on water inrush fault.(2)Using FLAC-3D numerical simulation software,based on the confined water containing fault seam mining 3D FSI numerical model,simulation analysis of different faults,different fault dip,fault in different pressure of aquifer stress and pressure of aquifer interaction by mining in the process of mining fault caused by vertical stress,shear stress stress,plastic zone and the change of pore pressure flow vector,obtain the factors of fault dip,fault throw and aquifer water pressure of confined water on mining effect of fault water inrush.(3)Combined with the field of Hengyuan coal mine hydrogeological data,using theoretical analysis,numerical simulation and analysis of the danger of water inrush through fault dynamic field geophysical methods in working face,through the fault rock advance grouting reconstruction method,realizes the confined water containing fault coal layer mining safety.