关键词: 露天矿, 内排规划, 整体优化, 堆置顺序, 0-1整数规划

Abstract: In order to further optimize the stacking sequence of rock and soil mass in open-pit dump and reduce transportation costs,an optimization algorithm for the stacking sequence of rock and soil mass in open-pit dump is proposed,which is oriented to the internal dumping transport of trucks and takes into account the dynamic changes of mining and stripping. The dumping position is represented by a block,and the mining and stripping position is represented by a solid model. The transport distance is calculated according to the coordinates of the entity centroid point of the mining and stripping position in each period,the centroid point coordinates of the dumping block body and the length of the working line. The transport distance is corrected considering the actual situation,and then the transport cost from the mining and stripping position to the dumping block in each period is calculated according to the transport cost. The time dimension is added to the abandoned block,and the time segment transportation cost is calculated. Based on the objective function of minimizing the total transport cost of the stripping material,the internal discharge planning model was constructed by taking the spatio-temporal development relationship,safe distance and discharge volume of the dump as constraint conditions. 0-1 integer programming was used to solve the model at one time in multiple periods,and the optimal stacking sequence of rock and soil mass in the inner dump was obtained. Taking an open-pit mine as an example,the proposed algorithm is used to optimize the stacking sequence of rock and soil masses in the mine′s internal dump. The optimization results show that:the total stripping transport cost of the optimal soil discharge planning scheme is 920. 994 1 million yuan,which saves 12. 841 7 million yuan compared with the original design scheme,and achieves the optimization goal of the optimal time and location of the soil mass discharge in the inner dump. The research results further reflect that:on the basis of the completion of the design of the waste dump,the deep excavation of the spatial and temporal development relationship of the waste dump engineering and the overall optimization of the multi-period waste dump planning are proposed,which has certain reference significance for the development of scientific and reasonable waste dump planning.

Key words: open-pit mine,internal dumping programming,overall optimization,stacking sequence,0-1 integer programming