Stability Study Of Slope Of Baiyunebo Eastern Iron Ore By FLAC3D

Strip mine side slope is whether stable which immediately influences to the mine regular production, personnel and equipment's safety and mine economic efficiency, therefore it is one problem worth studying and needs to be studied. There are many factors can influence the slope stability, and this article main consideration is the influence of blast shock and bolting to the side slope stability.This article takes east ore Northeast side slope the C area crag nature high side slope of the Baiyunebo open-air iron ore as the project background, based on the finite difference method principle, utilizes the FLAC3D software to establish the three dimensional numerical simulation anatomic model of side slope. Using this model, first carries on the initial stress field computation in the country rock and the soft rock situation, has analyzed most imbalance force restraining situation and the stress field distribution law of the side slope. Next carries on the mechanical analysis by simulating input blast earthquake load under tow kind situation, has analyzed interval curve and the stress change law when the test point displace, and obtains the influence result that blast shock to the side slope stability. Finally simulates and computes the side slope mechanical analysis under the same anchor rod reinforcement plan two kind situation, has analyzed the anchor rod internal force change situation in two kind situation after reinforced, the side slope displacement and the stress change value, has obtained the influence results that anchor rod to two different kind situation.Some conclusions were drew from numerical simulation calculating: Existence of soft rock did not affect the distribution regular of initial stress field obviously. But stress distribution regular changed under the effect of blasting load when soft rock existed. Compared to original rock, change range of value of strain and stress of the former condition was relatively large. Change range of stress in vertical direction was 26.1% and that in horizontal direction could be as large as 43.3% while stress in vertical direction of original rock hardly changed. On the slope surface with the same altitude, the more it outskirt the outer edge, the larger displacement amplifier coefficient was. Displacement amplifier coefficient increased gradually along altitude from the bottom to the top. After the rock was strengthened by anchor, horizontal displacement of original rock decreased less apparently, the range of which was as large as 10.37%.Reduced range of the displacement in horizontal direction could reach 18.7% when soft rock existed under the slope mass. Axis stress of vertical anchor and horizontal anchor was all 240.2KN when it was in original rock .The stress of ambient mortar and rock in vertical direction was a little larger than that in horizontal direction .Axis stress of the anchor and stress of the ambient mortar and rock in soft rock was larger apparently than that in original rock, and axis stress of the vertical anchor (287.3KN) was larger than that of the horizontal one. Stress of mortar and rock around was twice than that of the horizontal. A certain reference value for slope stable protecting and administering was offered by the calculating results of this paper.