Seismic Response Analysis And Liquefaction Evaluation Of Fine Tailings Dam

The Li Nong ditch tailing dam lay in seismic area of 8 degrees and is piled with the tailing's material:Its height reaches about 185 m and the dam body belongs to and exchanges the liquefaction material.The most outstanding problem is dam body stability and liquefaction under the function of loading of the earthquake in reality. The thesis mostly work is mathematical analysis, gives some basic information of the research object—the Li Nong big ditch tailing dam, determines research task and purpose and analysis condition that is the dynamic analysis and liquefaction evaluation.Utilizing dynamical finite element method based on Mohr-Coulomb plastic model and Using the FLAC software, had got the changed laws of stability, acceleration and displacement variation of central line damming under seismic action.①The dynamic response characteristics of acceleration:The maximum acceleration of the dam appeared in a strong shock stage. And under strong vibration, the different dam location's variations of acceleration are followings:On the slope, the maximum acceleration changed from large to small, and then gradually increased, reached the maximum at the foot of the slope. It showed a gradual upward trend from bottom to top in the axial direction. However, the magnitude of increase is very small. The trend of maximum acceleration in level node gradually decreased from left to right.②The dynamic response characteristics of displacement:Early in the vibration-the horizontal displacement of the slope surface showed the trend that the greater displacement with the greater height; After strong vibration force, displacement increased rapidly outside the lower slope of the dam.; Under vibration later time, the changed distributions of dam displacement are basically same as the first 10 seconds, only a slight increase in the overall displacement.③Utilizing grade curve, SPT, relative density found the whole tailing dam silts were likely to soil liquefaction. But through the numerical simulation of void water pressure it didn't caused apparent liquefaction of tailings dam in the shock.