弓长岭露天矿顺坡断层影响的数值分析

Numerical Simulation on Influence of Longitudinal Fault of Gongchangling Open Pit

对弓长岭露天铁矿北帮岩体边坡建立了FLAC计算简化模型,采用弱化法和Interface法对走向顺坡断层进行了模拟分析。数值模拟采用摩尔-库仑模型并分10步进行开采,分析了受断层影响产生的岩体内应力与位移的不连续性,确定了边坡表面岩体、断层破碎带充填物及断层附近岩体的塑性流动区、塑性卸载区和拉伸破坏区的产生与发展的演变规律,并对比分析了弱化法和Interface法模拟断层力学行为的适应性与优缺点。

This paper establishes the FLAC computation simplified model for the rock slopes in the north side of Gongchangling Open Pit.It simulates and analyzes the longitudinal fault by adopting the weakening method and the interface method.In the numerical simulation,Mohr-Coulomb model with 10 steps is adopted in mining to analyze the discontinuous of stress and displacement in the rock affected by faults.Then,the evolution law of the surface slope rock,the fills in faults and fracture zone,and rock plastic flowed area,plastic unloading area and tensile failure zone near the faults are confirmed.The adaptive feature of mechanical behavior of faults by the two methods and their merits and demerits are compared and analyzed.