Stability Analysis And Control Measures Of South Main Slope In Bayan Obo Iron Ore Based On FLAC^3D

The South part of iron ore stope primary closed loop has been formed in BAYANOBO, and has entered the furrow mining, more than1626m has on the slope, and showsslope height over80meters; From the exposed slope situation, The lithology and structureis complex, fault fracture zone and dykes are more exposed in a large width and make theslope toward similar tendency to erect or anti-dumping, leading to negative slope stabilityon stairs,it is so obvious to slump and toppling slope relying on stairs that has seriouslythreatened to the safety production.Deep mining be designed in accordance with the nearthe boundary and the overall stability of the slope near the borderis currently facing majorproblems.Therefore, Itis the main purpose and task of this thesis work whichAccuratelygrasp the rock slope in open-pit mining geological conditions of deep concave,to analyze the stability of slope, to make rational treatment scheme according to the actualsituation.First of all,visiting the mine,collecting field data, based on field data and rockmechanics parameters FLAC3Dbuild three-dimensional geological model of thedisplacement of the slope of the stress as well as digital simulation of plastic zone are in anatural state and storm conditions, After a comprehensive analysis,(1) Overalldisplacement of the maximum slope of96mm, the displacement from the bottom upgradually to increase, Displacement obviously occurred in two fault cut the upper part ofthe body, namely F17and F15fault. Deformation of slope displacement increase graduallyfrom bottom to top, the east down1230m platform, finally the west slope deformationstretch to1346m platform.1230m and1346m platform at the bottom of the slopedisplacement approximation is equal to zero, this did not happen the slope integrity mobilecan be deduced.(2) Deep displacement of slope is opposite bigger, to gradually decrease.Due to the smaller values of the displacement of the deep overall destruction may nothappen, but give priority to with shallow or local slope sliding;(3) Stress value is negative,this shows that the slope is mainly compressive stress of excavation unloading, if the slopedestruction, the main damage form as“pressure--shear”destruction;(4) Through unicom’s plastic zone does not appear, this shows that in the natural state of slope is stable, notoverall landslide mass;(5) Under storm conditions, the overall slope of the maximumdisplacement, the maximum displacement and vertical displacement are larger than themaximum level of the natural state, indicating that storm weaken the strength of the stormwith broken rock to reduce the resistance to deformation, the top of the slope appearsstretched destruction unit, but not through the formation of the plastic zone, destroy theintegrity of the slope will not happen.Two-stage small-aperture blasting, verify its practical effect on the main ore south,To determine the blasting parameters, size130mm, the hole distance of1.3m; Drug rolldiameter47mm, wire-bound drugs density0.375kg/m, pre-hiatus segmented detonatedway, The experience provides a reasonable way for the mine production and managementin the slope.According to the stability analysis and site specific conditions, formulate rationaldesign.