Effect of fine content on the liquefaction characteristics of graphite tailings
As a high potential energy hazard,tailings dams are prone to liquefaction during earth-quakes,resulting in dam instability and failure,compromising the safety of tailings dams.This study conducted dynamic triaxial tests to examine the effect of fine content(Fc)on the liquefac-tion characteristics of graphite tailings from Jixi City,Heilongjiang Province,under three kinds of cyclic stress ratio(CSR).The Ishibashi pore-water pressure model was used to simulate the growth of pore-water pressure,and the effects of consolidation ratio,confining pressure,and sat-uration on the liquefaction characteristics of graphite tailings were also investigated.Results show that as fine content increases,the resistance to deformation increases,the rate of pore-water pressure growth slows down,and the resistance to liquefaction is enhanced.As CSR increases,the resistance to deformation decreases,the growth rate of pore-water pressure accelerates,and the resistance to liquefaction diminishes.The Ishibashi pore-water pressure model effectively sim-ulates the development of pore-water pressure during the liquefaction of graphite tailings with va-rying fine contents.The results also indicate that an increase in the consolidation ratio and confi-ning pressure inhibits the liquefaction of graphite tailings,enhancing its liquefaction resistance.Conversely,an increase in saturation promotes liquefaction and weakens its resistance.A lower CSR indicates a more evident effect of these factors on the liquefaction characteristics.The re-search results provide a scientific and reasonable theoretical basis for understanding the liquefac-tion behavior of graphite tailings dams.
dynamic triaxial testgraphite tailingsfine contentliquefaction characteristicspore-water pressure model
万方数据
维普
