Study On The Stability Of Tailing Dam And Disaster Early-warning Mechanism

China is a big country in mining fields. Every year, mining enterprise produces a large amount of tailing waste. However, apart from a part being used for mining filling, the residual waste needs to be stacked in tailing pond.. As one of the three control engineering, tailing pond is very important production facility of mining enterprise, and its safety and stability play a crucial role in normal production and operation of the business. Therefore, it is of great significance to conduct investigation related to the stability of tailing dam as well as the disaster early warning mechanism of tailing pond.This dissertation relies on the sub-project "Security risk assessment and disaster early warning analysis of tailing pond" of the research project "Construction of safety quality standardization system of Huanggang Mining Company and Development of its information platform". The main research contents are as follows:(1) The seepage field of tailing pond was investigated through simulation technology. Firstly, starting from basic conceptions such as tailing pond, tailing dam and so on, some basic situation of tailing pond was introduced. Then, according to basic material of tailing pond which was relevant to the research subject, the seepage theory was used to conduct simulation research of the seepage field of tailing pond. Analysis of influences of factors containing the drainage capacity of starter dam, the dry beach length of tailing dam, the anisotropy of tailing material, and the ratio of osmatic coefficient for the layers in sedimentary sequences of tailing pond on seepage field was included. The results show that phreatic line is raised not only when the drainage capacity of starter dam is declined but also the anisotropy is enhanced. Nevertheless, phreatic line is declined gradually when dry beach length is increased. With the ratio of osmatic coefficient for the layers is increased, phreatic line was dropped firstly, followed by a gradual rise.(2) The stability of tailing dam was investigated. Coupling analysis was developed based on the analytical theory of tailing dam stability combining with results of simulation analysis on seepage of tailing pond. The analysis was to investigate influence of factors containing the drainage capacity of starter dam, the dry beach length of tailing dam, the anisotropy of tailing material, and the ratio of osmatic coefficient for the layers in sedimentary sequences of tailing pond on the stability of tailing dam. At the same time, both the most dangerous sliding surface and the safety factor of each influencing element were given. The results show that the safety factor is presented a tendency of obvious largely decrease with the drainage capacity of starter dam is declined. However, the safety factor is increased largely when dry beach length is raised. Under the condition of constant vertical seepage coefficient, with horizontal seepage coefficient is enhanced, the safety factor is fallen. With the ratio of seepage coefficient of both upper and lower layer of tailing material is increased, the safety factor is risen. Nonetheless, the magnitude of the safety factor’s increase is decreased and then the factor will be leveled off when the ratio is increased to a certain extent.(3) Combining with the analysis of data which was obtained from real time monitoring on phreatic line by osmometer, the phreatic line height prediction model was establish based on grey Mark theory for the purpose of forecasting the future tendency of phreatic line. Then, a comparison was done between early warning value and predicted value to realize alert classification and developing relevant measures.