Analysis on seepage stability of tailings dam considering soil-layer interface effect
To investigate the influence of mechanical behavior at the soil-layer interface of tailings soil on the stability of tail-ings dam under the seepage conditions,a tailings dam in Qinhuangdao City,Hebei Province,was taken as the research object,and the safety factor of the tailings dam considering the soil-layer interface effect was derived by carrying out the seepage di-rect shear test and numerical modeling in FLAC3D.The results show that under the seepage conditions,the shear strength of tailings soil decreases as the water head height increases.The cohesive strength of the soil-layer interface decreases,while the variation in the internal friction angle is relatively gentle.At the same water head height,the shear strength of the soil-layer interface lays between those of the two soil layers,the cohesive strength of the soil-layer consisting of tailings fine sand and tailings silty clay is further reduced under multi-factor coupling effect.Compared to the Bishop method,the safety factors of the tailings dam considering the soil-layer interface effect under normal water level and flood conditions decrease by 29.0％and 12.1％,respectively.The research results can provide technical guidance for the stability analysis of tailings dams accu-mulated by multi-layer tailings soil.
NETL
NSTL
万方数据
