Dynamic Stability Analysis Of Tailings Dams And Dam Failure Disaster Simulation

China is an earthquake-prone country, the damage caused by the earthquake is catastrophic. To tailings dam, especially about upstream tailings dam in the earthquake area, are more susceptible to seismic factors, may lead to dam instability or even dam failure due to its special stockpiling way. Considering the complex effects of earthquake, it’s still a major difficulty in the current, to study the stability of the tailings dam under earthquake. Took a tailings dam engineering as the research background, the dynamic stability of the tailings dam under seismic loading has been studied, and the evolution of dam failure disaster has been analysised. The main research contents are as follows:(1) Systematically introduced the mechanism of the earthquake, seismic waves and the principle calculation method of seismic response, and then analyzed the mechanism of dynamic instability and the identification method of liquefaction of the tailings dam, based on the dynamic theory of soil.(2) Based on DTM(digital terrain model) file, established a three-dimensional numerical analysis model of a tailings dam, and according to synthetic seismic waves, use finite difference analysis software FLAC3D numerical analyzed the dynamic response of tailings dam. According to the results of the numerical simulation, detailed analysis the dam displacement, acceleration, pore pressure and liquefaction conditions of the tailings dam under dynamic load; and then research on the dynamic sensitivity of tailings dam under different seismic intensity. The results showed that the horizontal displacement of tailings dam was more sensitivity than vertical displacement to different seismic intensity, and the vertical acceleration amplification factor of dam crest was more sensitivity than the horizontal direction to different seismic intensity.(3) Established a numerical simulation model of the tailings dam failure disaster, by the debris flow simulation software FLO2D, to analysis and evaluation of the tailings pond dam failure disaster. And then coupled with the numerical simulation results and a digital mining software3DMine, to display the real-time process of dam failure disaster. Then according to the flow strength of the dam failure sediment, a three-color graph was drew to distinguish the disaster level of whole failure and semi-failure of the tailings dam. By this method, the evolution process of the tailings dam break was digitized and the hazard assessment of dam break disaster was quantified.(4) Based on the structure effects and seismic intensity factors of tailings dam, and unascertained theory, established an unascertained safety assessment model of tailings dam. And took a tailings dam project as an example, the safety evaluation was made. Then according to the mechanism of dynamic instability of the tailings pond, proposed safety protection methods, that is, take the rigid reinforcement measures and soft net system protective measures to reinforce the tailings dam seismic stability.