Study On Stability Of Inner Dump Slope In Baiyinhua No.3 Open-pit Mine

The important method of reducing the transportation cost and land acquisition expense is making the most use of reducing the inner dumping room.The engineering background of the thesis is the east of the Bai Yinhiua ? mine and the inner dumping of the western pit.With the comprehensive application of the site survey,theoretical analysis,and the combination rigid body ultimate equilibrium with numerical modeling,it studies the angle of inner dumping,and the effect of the different position of inner dumping development and its slope stability.The thesis design the slope formation in development,reveal the land slide mechanism of the internal dumping.The conclusion of the research tells us the inner dumping potential slippage pattern of the Bai Yinhua III is the combination slippage between the inner cutting arc and the base weak layer.The stability of the inner dumping will enjoy the liner increase with the decrease of the angle of the inner dumping and the increase of the boost distance.During this process,the angle of the inner dumping will influence the stability dramatically.The stable side slope angles of inner dumping are respectively 120?12°?120°?13°?130?14°,the width of flat pan are respectively 67m?66m?69m?64m?61m?67m;when the pushing distance of the western pit are Om?200m?400m?600m?800m?1000m,the stable slope angles of inner dumping are 13°?14°?14°?14°?14°?14°,when the width of flat pan are respectively 59m?59m?52m?57m?52m?52m,it will meet the security save demands of the ratio 1.1.The mechanism of land slide is that base weak layer produce plastic yielding with the self-gravity of the dumping materials,and it also produce the slide surface cut through with the combination of the dumping materials.As a result,it will form tier-bedding slide which uses the shear arch as the side interface and uses the base weak layer as the bottom boundary.This paper provides technical support to the design of Bai Yinhua ? opencast coal mine dump,and reference for the analysis of the stability of the inner dumping under the similar condition.