The Simulation Research Of Infiltration Of Iron Tailings And Overburden Iron Tailings

This paper takes the homogeneous soil and iron tailings as research objects through indoor simulation, to analyze the infiltration law of homogeneous soil, iron tailings and overburden iron tailings. The results showe that:1. The infiltration law of iron tailings accords with the general infiltration law of homogeneous medium. Comparing with homogeneous soil infiltration process, the stable infiltration rate of iron tailings varies in range of0.87-0.45mm/min with the increase of bulk density, less than the homogeneous soil, and the time for entering the stable infiltration is much smaller, which is100-190min. With the narrow distribution level of tailings’particle size which is much smaller than the homogeneous soil’s, so iron tailings’ matrix suction is bigger, infiltration faster, and the time required to reach steady state is also shorter.2. In iron tailings, homogeneous soil and covering-soil iron tailings infiltration, there is high fitting degree of empirical models, in which Horton model fits accurately in short period of water infiltration, but it does not apply to covering-soil iron tailings infiltration. General infiltration equation fits more accurately in long time infiltration.3. The fitting accuracy of the Philip model is relatively accurate in iron tailing and homogeneous soil infiltration, but comparing with other methods, there is lower accuracy using fitting parameter se to derive sf of Green-Ampt, turning out that parameter se of Philip model requires high precision.4. In Green-Ampt model, there are obvious differences of the average matrix suction at wetting front between iron tailings and homogeneous soil infiltration, in which homogeneous soil fitting sf ranges from40mm to660mm and tailings fitting sf ranges from785mm to1835mm. Comparing with homogeneous soil, iron tailings have finer particle content, smaller porosity and greater bulk density, therefore the parameter sf is bigger.5. Before the wetting front of covering-soil iron tailings infiltration into the sediment interface, its infiltration performance is consistent with the same density homogeneous soil infiltration’s performance, which is the smaller of the low bulk density, the closer of the performance in the steady infiltration rate and the stability infiltration time, the more obvious of reducing role of the low tailings seepage. By linear regression analysis, the cumulative infiltration process is a positive linear correlation with soil thickness, the time required to reach the interface is positively correlated with the soil thickness and soil bulk density.6. The stable infiltration rate and the average infiltration rate of covering-soil iron tailings infiltration are positively correlated with thickness of soil, and negatively correlated with soil bulk density and tailings capacity; steady infiltration time negatively related to soil thickness and tailings capacity, positively related to soil bulk density.7. Combined with Green-Ampt model and the basic theory of infiltration, this paper establishes an infiltration model of covering-soil iron tailings, and gives the solving method of the parameters in the model. By comparing the data model forecasting with the data measured, this paper proves the feasibility of the model...