| Tailings is a special kind of industrial buildings and also essential industrial construction for mining enterprises, while it is an artificial debris flow hazard with high potential energy as a matter of fact, the fatal water accumulation of tailings lead to phenomenon of extremely low degree of consolidation, high position saturation line of tailings dam which gives rise to frequently calamity accident such as collapse of dam, slurry leakage, dam breaking etc. on account of specific technique of discharge-accumulation and storage environment of trailing.From the perspective of accelerating its drainage consolidation of tailings accumulation body, a tailing drainage-consolidated physical model with discharge-accumulated process by height rising gradually was established on the basis of the characteristics of tailings reservoir,s operating environment in which geotechnical composite drainage material is used as vertical drainage channel. At the same time, its drainage-consolidated process was simulated by self-developed and test device which was designed based on physical model above, the results showed that:(1) rate of drainage accord with autoregressive integrated moving average model: ARIMA(2,l,8)x(0,0,0) on the condition of drainage-consolidated process of tailings with height rising gradually and model predicted results show that:the growth trend of maximal drainage rate becomes gradually bigger that is much less than the actual peak rate which reveals drainage performance fitness of tailings, discharge requirements.(2) excreting dry upper water accumulation in time provide essential conditions for consolidation of tailings under the effect of geotechnical composite drainage material and the average degree of consolidation stress can reach 62.32%～70.81%, the average degree of consolidation stress can reach 61.27%～68.91% after the experiment of 104 days. Moisture content of drainage consolidation is 25% higher than that of undrained consolidation which reveals the clearly promotion of consolidation effect.(3)the maximum radius of influence is a value changing over time on the conditions of discharge-accumulated process by height rising gradually by analyzing of the flow model in porous medium and curve fitting results of graphic principle show that:the maximum radius of influence with tailings height of 0.5m and 1.0m could respectively reach the value of 8.65m and 6.34m.Based on the two core indicators of rising automatically with tailings reservoir surface and efficient process of drainage-consolidation, a drainage consolidated device rising automatically with tailings reservoir surface was developed based on the results of model test and the characteristics of tailings engineering. Cylinder surface with static stability arm of 0.18m was selected as the computational optimization profile for drainage-consolidated device and its three-dimension design was done by CATIA. Finally, buoyancy, stability and static strength of drainage-consolidated device was calculated. Based on the research results above, setting parameters and layout form were determined. A new type of tailings reservoir was overall designed afterwards.Achievements provides a new train of thought for prevention and control of tailings hazard. |
