Numerical Simulation Of Ground Subsidence Induced By Underground Excavation On Shirengou Mine

At present,it is a highly serious problem of underground project that undergroundmining arouse terrane movement and ground subsidence. The balance of original rockstress was destroyed, wall rock was metamorphosed and displaced, and even havelarge acreage movement in the course of underground mining. With the increase of themining depth, ore were uninterrupted digged, the wall rock 's distortion andmovement and breach aggravate gradually. So, in order to achieve safety mining , itis necessary in the course of underground mining that research the super terrane moving-rule and the effect on ground movement and the stope ground pressure's regularities ofdistribution.Aim at this existing state, this paper established mechanical reduced model andmathematic models for ground subsidence, with the research object—Shirengou Ironmine, through the survey on the engineering geology and the field of original rock stressand structural parameter. The result of analysis brought out supperterrane critical conditionfor fracture in the process of mining. This paper applied the FLAC software, adopted themethod of numerical Simulation, simulated substep the process of mining of themathematic model of groud subsidence excavation. In the course of simulation, theprocess of variation on stress and displacement in the course of excavation were analyzedmostly. On the basis of the analytical result, the paper summarized the rule ofsupperterrane and ground's movement because of underground mining. At the sametime, the paper drew the curve of dynamic movement at the different mining stages. Atlast this study offered the solving process of traveling angle and the step of delineating therange of movement.The study successfully of this paper not only have an effect on safety in productionand ecological environment, not only have instructional significance to technicalcondition and ground pressure's regularities of distribution in the course of undergroundmining in the future. Research finding will enrich design theory, widen the field ofapplication about theory of mining subsidence and advanced a new research technique tothe theory of subsidence. So this result has the higher expansion value and widedeveloping foreground.