The Earthquake Liquafaction And Stablility Analysis Of Tailings Dam

China is a country of more than one mine, and thus tailing ponds are widely distributed. The liquefaction problem of the tailings dam and reservoir area caused by earthquake is concerned by many domestic and foreign scholars. The liquefaction is a phenomenon that when saturated sand is squeezed by level or vertical earthquake, soil pore water pressure keeps rising and beyond its original hydrostatic pressure, soil shear strength drop down to zero when the pole water pressure equals to overlying effective stress. The numerical simulation of liquefaction should be given two-dimensional and three-dimensional annlysis by engineering examples. First, separately select the stress model and the strain model of vibrating pole water pressure calculation model; then determine the liquefied area of tailings dam and reservoir area by the effective stress method. In addition that comparatively calculate safety factor of the dam slope by finite element method, quasi-static method and strength reduction dynamic analysis method.The work about the above-mentioned content has been carried out as follows:(1) Two-dimensional analysis of tailing ponds, that is, taking project examples into account, compare the distribution of the liquefaction area while calculating different lengths of dry beach in cases that the dam face of tailing dam is with or without a siphon well for drainage; and show a detailed analysis and explanation to the distribution of the liquefaction area.(2) Three-dimensional analysis of tailing ponds, that is, contrapose projects under the two-dimensional analysis, with the help of a finite difference software FLAC-3D, make three-dimensional model of the example, prepare its command stream, monitor the liquefaction of different tailing dam and reservoir area units, and compare the distribution of the liquefaction with the results of two-dimensional analysis.(3) Slope stability analysis contraposing two-dimensional examples. There are mainly two methods for comparison, that is, finite element method and quasi-static method. The dam slope safety factor results educed through methods mentioned above and to compare the two safety factors, particularly analysis the slop stability after adding a siphon well to the project.(4) Slope stability analysis contraposing three-dimensional examples. Mainly use strength reduction dynamic analysis method for calculation, combining three general conditions for estimating slope instability, and compare the diffrence of the safety factors between two-dimensional and three-dimensional.