摘要
为了研究马坑铁矿地下开采对覆岩体的破坏情况及岩体渗流特征,依托马坑铁矿西矿段60线以西矿体开采工程,采用FLAC3D数值模拟软件构建了流固耦合模型。模拟了西矿段60线以西矿体充填采矿法开采过程,揭示了开采后上覆岩体塑性破坏区分布特征,探究了采动覆岩体渗流演化规律,并评价了采充后的采场渗透性。研究表明,矿体开采导致采场周边、断层、岩桥及构造破碎带产生明显的塑性破坏区,采场、断层及采场岩桥间产生局部破坏,甚至贯穿破坏;随着充填开采的不断推进,采动覆岩体的导水能力不断增强,顶板的渗流速度均大于侧帮,渗透性受断层及破碎岩体的影响较大,孔隙水压力等值线不断向断层方向扩散,但渗流场最终未形成河流→断层→岩桥→采场的渗排水通道。
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 6o line in the west ore section of Makeng Iron Mine,the fluidsolid coupling model was constructed by FLAC3D numerical simulation software,and the mining process of the filling mining method in the west ore body of 6o 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.
作者
董军庭
DONG Junting(Fujian Makeng Mining Co.,Ltd.,Longyan,Fujian 364021,China)
出处
《矿业研究与开发》
CAS
北大核心
2024年第12期116-125,共10页
Mining Research and Development
关键词
充填采矿法
采动覆岩体
渗流场
采场渗透性
Filling mining method
Mining overburden rock mass
Seepage field
Stope permeability
