Finite Element Analysis of Seepage and Static and Dynamic Characteristics of the Tailings Dam
For assessing the safety of the tailings dam,the finite element method was utilized in this research to calculate the seepage,and the static and dynamic behaviors of the dam,with an emphasis on the analysis of the seepage safety,seismic displacement,the acceleration,seismic stability of the dam slope,the permanent deformation and the liquefaction area.The results showed that the distribution of the phreatic line was reasonable.The buried depth of phreatic line met the specification requirements,and the seepage gradient was less than the allowable value,indicating an overall high seepage safety of the tailings dam.Under the static condition,the distribution of stress and stress contour of the tailings dam was generally reasonable.The extreme value of the stress was 0.78,thus no shear failure occurred.Under the action of the seismic fortification Level Ⅶ,the distribution of the dynamic displacement and acceleration of the dam was reasonable,with the extreme values of the horizontal and vertical dynamic displacement standing at 4.81 cm and 0.93 cm,respectively.The extreme values of the horizontal and vertical dynamic acceleration were found at 3.33 m/s2 and 2.62 m/s2,respectively.It is also observed that the minimum safety factor of the dam slope against sliding during earthquake was 1.09,and the cumulative permanent deformation after earthquake was 8.34 cm.The liquefaction area was observed at the shallow surface of the beach covered by the tail water.The tailings dam showed an overall good performance in seismic safety.
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