To study the damage and seepage characteristics of the overlying rock mass caused by underground mining in Makeng Iron Mine.Based on the mining project of the west ore body of 60 line in the west ore section of Makeng Iron Mine,the fluid-solid coupling model was constructed by FLAC3D numerical simulation software,and the mining process of the filling mining method in the west ore body of 60 line in the west ore section was simulated.The distribution characteristics of the plastic failure zone of the mining overburden rock mass after mining were revealed,the seepage evolution law of the overlying rock mass was explored,and the permeability of the stope after mining and filling was evaluated.The research shows that the mining of ore bodies leads to obvious plastic failure zones around the stope,faults,rock bridges and structural fracture zones,and local damage or even penetrating damage occurs between the stope,faults and rock bridges.With the continuous advancement of filling mining,the water conductivity of the mining overburden rock mass is continuously enhanced,and the seepage velocity of the roof is greater than that of the side wall.The permeability is greatly affected by faults and broken rock masses,and the pore water pressure contour continues to spread to the fault direction,but the seepage field does not eventually form a river→fault→rock bridge→stope seepage drainage channel.
关键词
充填采矿法/采动覆岩体/渗流场/采场渗透性
Key words
Filling mining method/Mining overburden rock mass/Seepage field/Stope permeability
维普
万方数据