采场围岩流固耦合数值模拟与充填采矿参数优化

Numerical Simulation of Fluid-Solid Coupling of Wall-rocks in Stope and Parameters Optimization for Backfill Mining

司家营铁矿属于水文地质条件复杂类型,为确保采矿安全和矿区水文环境,采用充填采矿法采矿,建设规模为年产铁矿石2 000万t。矿山南区地表赋存丰富第四系含水层,采用渗流-应力耦合数值正交试验,建立了南区开采的优化设计模型。通过数值模拟和优化分析,揭示地下开采对地表岩移和渗流场的影响规律。对于南区充填法采矿,采用所获得的采场结构参数和充填体强度,可以控制地面变形在允许的范围内,潜在大量涌水主要发生在-450 m段和-350 m段,必须采取安全防范措施,避免采场突水灾害。

Sijiaying Iron Mine is the mine with complex hydro-geological conditions.To ensure the mining safety and protect the local hydrological environment of mine,the back-filling mining method was adopted to realize the annual capacity of 20 million tons of iron ores.There exist abundant Quaternary aquifers in the surface of southern district of the mine.The optimal design model is established in this district by the orthogonal numerical experiments of seepage-stress coupling.Through numerical simulation and optimization analysis,the effect of underground mining on the surface movement and the seepage field are revealed.For the back-filling method in southern district,the ground deformation can be controlled within the allowable range by adopting the mining structural parameters and filling strength obtained above.Amounts of potential water inflow mainly occurred in-450 m and-350 m section,which must be controlled by taking safety precautionary measures to avoid the water inrush disasters in stope.