Study On The Tailings Reservoir Of Measurement Water Line By Ultra-high Density Resistivity Method And The Stability Of Tailings Dam

The biggest harmful factor of Tailing ponds, essential facilities for mine production, is dam break as a result of overtop water level of tailing ponds leading to the elevation of infiltration line and decrease of dam stability. Measurement methods of tailings water level are various. Of these methods, super high-density resistivity method with good mobility and short work time, is an efficient lossless detection, which has not be applied widely yet. The achievements obtained in this paper by connecting theory and experimental research are as follows:(1) Through the data fitting of tailing moisture rate and corresponding electrical resistivity by the generalized Archie formula, it is concluded that the correlation coefficient is0.99905, proving that this extension of Archie formula is applicable to electrical resistivity of tailings.(2) Resistance rate model concerning tailing electrical resistivity is established, based on which the forward calculation is made with the method of super high-density resistance and the apparent electrical profile is obtained. through the analysis of the relationship between apparent resistivity and true resistivity, it is discovered that the variation trend of apparent electrical resistivity obtained by super high-density resistance is consistent with that of original model’s resistivity, which is capable of providing water level measurement for tailing ponds.(3) Data fitting concerning saturation, porosity and depth of tailings in study area is made and it is concluded that the relationship between tailing saturation and depth is of logarithmic function and quadratic polynomial for tailing porosity and depth. Based on these, the functional relationship between tailing electrical resistivity and tailing depth is calculated by combining modified Archie formula.(4) By calculating the first depth derivate of the curve on tailing electrical resistivity and tailing depth, it is concluded the boundary, waterline of tailing pond, between saturated tailings and unsaturated tailings is near the depth, whose third derivate is zero, as long as all of the first, second and third depth derivate of tailing electrical resistivity function are zero simultaneously. By this method and data inversion of field data measured by super high-density resistance, it is concluded that the difference of which is less than5%, showing feasibility of this method.(5) Through calculation with three limit equilibrium method and seepage coupled, the minimum safety coefficients are both greater than1.25when the east tailing pond or the west one are suffering a heavy rain lasting for24hours, indicating the stabilities of both tailing ponds. And the linear data fittings of the minimum safety coefficient and rainfall are made when both tailing ponds suffer four different rainfalls with the result that all fitting correlation coefficients are greater than0.92, which indicates the relationship between minimum safety coefficient and rainfall is of linear dependence as the correlation coefficient value is great. Furthermore, as for the west tailing pond, the rainfall has a bigger effect on the minimum safety coefficient under the same condition with the same rainfall and rainfall time as the sectional length of the west tailing pond is greater.