基于边际费用净现值法的露天矿采区间压帮高度优化

Optimization of slope cover height in adjacent mining districts with net present value method for marginal costs

运用露天采矿学的基本原理,结合近水平露天矿的实际情况,建立了简化的露天矿几何模型,根据几何模型中参数的数学关系,以矿山单一生产年为计算期限,以压帮高度为自变量,分析了压帮高度与受影响工程量、爬升运距、工作帮运距、内排土运距的函数关系,进而建立以边际费用最小为目标函数的优化模型,计算出静态条件下合理的压帮高度。然后以二次剥离费用的投入滞后时间为自变量建立模型,计算出不同压帮高度的滞后时间上限值。

A simplified geometric model for open pits is built in the fundamental principle of surface mining engineering and in light of the practical situation of almost horizontal open pits. The functional relationship between the slope cover height and the af- fected quantities, raising transport distance, working-wall trans- port distance and in-pit dumping transport distance is analyzed with a single mine production year as a calculation period based on the mathematical relation of the geometric parameters in the model. Then, an optimization model with minimum marginal costs as an objective function is established to calculate the appro- priate slope cover height at static state and a model is set up by defining the input lag time of secondary stripping costs as inde- pendent variable to calculate the upper time limit to the different slope cover heights.