Three-dimension Static And Dynamic Stability Analysis Of Jinduicheng Wangjiaping Tailings Dam

In recent years, with the rapid development of China’s national economic construction,the demand of iron, aluminum, manganese and other mineral resources increase rapidly. So, itis a big challenge for mining enterprises in china. Tailings dam as an important productionfacilities in mine, its operating conditions is not only related to the safe operation of the mine,the most important is that it will be a direct threat to the downstream area’s ecologicalenvironment and people’s safety of life and property.Based on the research of engineering geological conditions, formation sedimentarycharacteristics and physical and mechanical properties of Wangjiaping tailings dam, the thesisutilize FLAC^3Dfinite element software to simulate the mechanical properties of the tailingsdam in different packing height, different deep of saturation line under the static or dynamicconditions, to analysis the change of stress, displacement and pore water pressure in thenatural and under earthquake load.The main research contents of the paper are involved:（1） We set up three-dimensional model, who is closer to reality, through the collection ofrelevant information, the brief analysis of the engineering geological conditions and thephysical and mechanical properties of Wangjiaping tailings dam.（2） Use FLAC^3Dsoftware to analysis the static stability, to research the tailings dam’sdistribution of the stress and displacement and the dam’s steady state under the natural station.The results show that, under the natural state, Wangjiaping tailings dam is stable. The stabilitycoefficient is between2and3.2, which is accordance with the standard requirement. Thestress of tailings dam is mainly compressive stress. And the maximum displacement isdistributed in the upper slope of the accumulation tailings. Besides, the tailings packing heightand the deep of saturation line are affected the stability of the tailings dam, and the influenceof the packing height is more significant than the deep of saturation line.（3） Use FLAC^3Dsoftware to simulate the tailings dam’s dynamic stability and researchthe changes of the residual deformation and the pore water pressure. The results showed that, under the seismic load, Wangjiaping tailings dam is stable. The stability coefficient is between1.2and2.8, which is accordance with the standard requirement. The maximum residualdeformation of tailings dam is distributed in the upper part of the accumulated tailing slop. Inaddition, under the seismic loads, the tailings dam’s excess pore pressure ratios are less than0.7under the different conditions. According to the liquefaction criterion, we knowWangjiaping tailings dam is not liquefacient. Moreover, the tailings packing height, deep ofsaturation line and tailings particle size are all affected distribution of the excess pore pressureratio. Higher the tailings packing height, shallower the saturation line depth, finer the tailingsparticle, the tailings dam’s excess pore pressure ratio is more great and the tailings is moreeasily liquefied.