Risk Analysis and Treatment on Seepage and Breaking of Tailings Dam

Abstract—Online monitoring has been done in the Mengku tailings dam which stores iron ore. On September 14, 2016, the data of the monitoring points above 950m were obviously abnormal, then the field investigation was immediately carried out. The investigation showed that there were serious seepage problems on the dam slope and the swamping phenomenon occurred on the surface of dam. On the basis of the project research and practice, analyzing the seepage problems with the hydraulic method that deduced by Darcy's law, calculating the seepage line equation of this segment and verifying the results by numerical simulation. The hydraulic gradient of spill point, the hydraulic gradient of flowing soil damage and the hydraulic gradient of piping damage are calculating, it found that the hydraulic gradient of spill point is less than the hydraulic gradient of flowing soil damage and the hydraulic gradient of piping damage, so a conclusion is drawn that the cross section has water seepage phenomenon, but the phenomenon doesn’t lead to flowing soil damage or the piping damage. In order to quickly eliminate the accidents, some effective measures of precipitation should be used to avoid the happening of the dam damage.