Study On The Anti-liquefaction Stability Of Fine High Stacked Tailings Dam

Tailings dam is a heap of metal and non-metallic structures such as mineral processing wastes and also one of the major hazards in mines. Especially for areas of high seismic intensity high fine tailings stacked dam, in the event of dam-break accident, will give the people downstream of tailings dam caused huge losses of life and property, the environment pose a serious threat. This paper, through theoretical analysis, field testing, laboratory test, numerical analysis and field method of combining engineering practice, in seismic liquefaction stability of the fine tailings dam high heap a more systematic study. The main works done and the conclusions obtained are as follows:(1) Analysis of fine-grained tailings dams at home and abroad, and high stability of the heap status of dam seismic liquefaction. This paper made a systematic study of fine tailings dam of high seismic liquefaction reactor stability analysis of urgency. Tailings conducted for the analysis of particle composition, physical and mechanical properties analysis and dynamic properties analysis. Through the calculation and analysis of Uniformity coefficient and curvature coefficient, the fine tailings tend to draw level with a good soil. The clay of Shallow mealy sand and tail silt content less than 13%, which may be liquefied, in the case of 8-degree earthquake, so seismic liquefaction need further analysis.(2) Using the geotechnical software Geo-Studio create different conceptual model for dam height, Calculated by pseudo-static method analysis of different high degree of stability safety factor of Dams, Preliminarily determined that the fine-grained tailings dam can be stacked to 115m.(3) Established dynamic response conceptual model of tailings dam for taking a step forward arguments for the stability of the dam's stability of anti-liquefaction. Use of synthetic seismic wave analysis of its dynamic response, and analyze different parts of the seismic response of dam acceleration, displacement and which changes over time in different. Compared the changes of void water pressure between before and after the earthquake, and draw it match with our tailing dam constructed with upstream method Observed in the case of actual earthquake. (4) Combined with conventional liquefaction estimation and shear stress contrast method to get the shallow tailings dam liquefaction easy under 8 degrees of earthquake. Liquefied area mainly concentrated in the bank below the water surface and the downstream slope toe. Tailings dam under flood water to run a higher saturation line, Made at the downstream toe of the tailings is more prone to liquefaction, the range is greater, large-scale downstream slope of the shallow slide may occur, affecting the overall stability of the dam.(5) Combined with the results of anti-liquefaction stability analysis and practical engineering, dam slope can use the drainage measures of Large-diameter radial well, reduce the slope water table, to eliminate causes of liquefied tailings; Drainage wells, tunnels and other forms can be used for inside the part of the tailings drainage, flood prevention and control over operations; You can also take sticking slope antilittering drainage, Improve the anti-liquefaction capacity of the dam, and so on.