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基于多目标优化的露天矿进度计划编制方法研究

Research on open-pit mine schedule planning method based on  multi-objective optimization

  • 摘要: 为寻求特定露天开采程序下的最优进度计划,实现矿山经济效益最大化。采用线性规划方法,以达产时间最短、达产后
    3 a内总采煤量最大及设备调动次数最少为目标,以设备数量、采剥工程关系及设计煤炭产量为约束条件建立进度计划编制的多目标优化模型,并利用优先级法对模型进行求解。设计了最早投、达产年的计算方法及年度采煤量均衡方法;利用表上作业法和反向动态规划设计了减少调动次数的进度计划编制方法。以布沼坝露天矿由西向东全区开采为例,将电铲数量、年生产能力、回采率、电铲能力、掘沟电铲数和扩帮电铲数作为限制条件,对露天矿进度计划进行编制,结果表明:达产后第3年可开采至第11阶段,并在该年末可采完第11阶段内87%的矿岩量。将第11阶段内与前10阶段的矿岩量表进行整合,作为基建开始至达产后第3年的总采剥工程量,根据年最大化原煤开采量与达产要求煤量的关系,利用优化模型进行迭代求解,得出均衡后的采剥量,利用表上作业法和反向动态规划完成采剥计划编制。优化后的进度计划可实现3 a投产、5 a达产、前8 a原煤开采总量达37.19 Mt、设备调动次数53次。与其他3种未优化的进度计划均值相比,投产时间提前了0.3 a,达产年提前了0.6 a,总采煤量增加了3.7 Mt,总调铲次数减少了19次,上述量化指标表现出明显优势,验证了本优化方法的效果。

     

    Abstract: In order to seek the optimal schedule under a specific open-pit mining program to maximize the economic benefits of the mine, the linear programming method was adopted. Aiming at the shortest time to reach production, the maximum total coal mining volume within 3 years after production and the minimum number of equipment transfers, the multi-objective of schedule planning was established with the constraints of equipment quantity, the relationship between the mining and stripping projects and the designed coal output. The model was optimized and solved using the priority method. The calculation method of the earliest investment and production year and the annual coal mining volume balance method were designed by using the on-table operation method and the reverse dynamic programming to design a schedule plan to reduce the number of transfers to prepare. Taking the mining of the Buzhaoba Open-pit Mine from west to east as an example, the number of electric shovels, annual production capacity, recovery rate, electric shovelling capacity, the number of trenching electric shovels and the number of expanding electric shovels were used as constraints. The plan has been compiled and the results show that:after reaching production, it can be mined to the 11th stage in the third year, and 87% of the ore rock in the 11th stage can be mined at the end of the year. The ore and rock scales in the 11th stage and the previous 10 stages were integrated, and used as the total mining and stripping engineering volume from the start of the infrastructure to the third year after production. the optimization model was iteratively solved to obtain the balanced mining and stripping amount, and the mining and stripping plan was completed by using the table-based operation method and reverse dynamic programming. The optimized schedule can be put into production in 3 years, and reach production in 5 years, the total amount of raw coal mining in the first 8 years will reach 37.19 Mt, and the number of equipment transfers will be 53 times. Compared with the average of the other three types of unoptimized schedules, the commissioning time is advanced by 0.3 years, the production year is advanced by 0.6 years, the total coal mining volume has increased by 3.7 Mt, and the total number of shovel adjustments has been reduced by 19 times. The above quantitative indicators show obvious advantages and verify the effect of this optimization method.

     

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