| Most of China’s tailings ponds are upstream tailings ponds.The research object of this paper is an upstream paste tailings pond.The library catchment area is large,the accumulation of discharge paste backfilling under present close on hydrophobic,and laid the tailings dam early in geotechnical anti-seepage film,all these three conditions make the seepage line of the tailings is high,it is easy to cause the seepage damage,tailings contains lots of saturated tail sand,in under the action of earthquake liquefaction are likely to happen even dam,so the analysis of this kind of the tailings is necessary to conduct a comprehensive study.In this paper,the seepage,static and dynamic characteristics of tailing ponds at different elevations are studied by means of numerical simulation,their stability is analyzed,and Suggestions are given,which can provide technical support for similar tailing ponds.The main contents of the study are as follows:(1)Midas GTS is used to simulate the three-dimensional seepage flow at different elevations of the tailings pond under normal working conditions and flood working conditions,analyze and evaluate the stability of the tailings pond at each stage,find out the most dangerous period and give corresponding treatment Suggestions,and study the influence of the platform on the infiltration line of the tailings pond.(2)Taking the most typical section of tailings pond as an example,geo studio software is u.sed to calculate the anti-slip stability of each stage of tailings pond and analyze its stability.The variation law of slope stability with the increase of dam height is obtained.(3)Geo studio software is used to calculate the static state of the tailings reservoir at different stages,to obtain the initial static field,determine the stress state of the dam body and foundation before the earthquake,judge the deep stability and provide data support for seismic dynamic response and liquefaction analysis.The stress and displacement of each stage are analyzed,and the static stability is evaluated.(4)The dynamic time history of the tailing reservoir is analyzed and calculated at different stages,and the dynamic response law is summarized.It is found that the horizontal seismic response of tailings dam is stronger than that of vertical seismic response and the dam body has a larger horizontal displacement.Seismic acceleration has amplification effect along the dam height,especially in the piled dam crest and the initial dam crest acceleration amplification factor obviously increases.The acceleration amplification coefficient of piled dam crest decreases with the increase of dam height.(5)Calculated at various stages of liquefaction,at the beginning of the tailings backfilling materials due to the relatively thin,the tail of the tailings sand liquefaction scope is bigger,in the liquefaction area of the tailings dam under the action of seismic wave with the heightening of dam body showed a trend of decrease after the first increase,most liquefied area located in backfilling layer infiltration offline,at the top of the sedimentary beach backfilling layer of liquefied area area is relatively large. |
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