More importantly, because the conical pile occupies such a small ground area in relation to its volume, soil pressures on large piles can exceed the bearing strength of the local soil. This results in very long conveyors and supports and accompanying large foundations to withstand the loads on the conveyor. One disadvantage is that very high stockpiles are required to attain large storage capacities. The main advantage of the conical pile is that it can easily be built by dozing equipment or a fixed belt conveyor. Substituting this value for A reduces Equation 1 to:Ĩ.18 x 10 -4 R☽ = capacity in metric tons………………….(2)Ĥ.09 x 10 -4 r³d = capacity in short tons…………………(3)įor convenience, typical stockpile capacities have been tabulated in both metric and English units in Table 1. This fact will become important later in considerations of live storage capacity.įor many common materials, the angle of repose, A, is about 38 degrees. One should also observe at this point that one-half of the capacity of the stockpile is in the lower 1/5 of the pile.
Increasing the height of the stockpile by 26% results in a doubling of the stockpile capacity. This means that the capacity of the conical pile grows very rapidly as the height (and hence the radius of the pile) increases. Note that the capacity of the conical stockpile varies with the cube of the radius of the pile. The total stockpile capacity is given by:ģ.14 (Tan A)R³ D/3000 = capacity in metric tons…………………(1)Ī = angle of repose for material to be stockpiled
The conical stockpile is the simplest and easiest to analyze. Stockpiles fall into two general categories: conical and elongated. Calculating Stockpile Capacity: Once the minimum storage capacities which will assure maximum mill output are known, the appropriate stockpile configuration must be determined.
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