露天开采是煤炭资源的重要开采方式之一，确保露天煤矿生产能力持续稳定对于保障煤炭稳定供应、维护国家能源安全等具有重要意义。本文以哈尔乌素露天煤矿为工程实例，针对其首采区工作线退回至矿权界内后，工作线长度变短、采区宽度变窄的特殊条件下，如何确保实现35Mt/a原煤产能的问题，以技术可行性与经济合理性为原则，综合考虑工作线长度对生产剥采比、剥离物内排运距、原煤产量规模等的影响，建立了以年剥离总费用最低为目标的工作线长度优化数学模型，确定了经济合理工作线长度为1620～2315m，在此基础上，进一步结合哈尔乌素露天矿现有采掘设备生产能力和设备布置方案，分析确定了当工作线年平均推进度控制在400m～515.25m可行范围内时，使采掘设备生产能力充分发挥的工作线长度为1820m。基于此工作线长度，创新性地采用蒙特卡洛方法设计工作线形态，提出了3种满足工作线长度要求与年推进度限制的工作线布置与发展方式方案，在对3种方案进行模拟开采与工程推演的基础上，构建了基于各方案平均生产剥采比、剥离加权平均运距、原煤加权平均运距、剥离加权平均提升高差、原煤加权平均提升高差和平均最大推进度等6项关键指标的客观赋权法CRITIC-TOPSIS综合评价模型，对3种方案的评价结果表明，方案2与理想解贴近度最高，能够使哈尔乌素露天煤矿在采区变窄条件下以最佳技术与经济效益实现35Mt/a的原煤产能目标。

Open-pit mining is one of the important mining methods of coal resources. Ensuring the production capacity of open-pit coal mines is of great significance for ensuring the stable supply of coal and maintaining national energy security. In this paper, taking Haerwusu Open-pit Coal Mine as an example, aiming at the problem of how to ensure the realization of 35Mt/a high design capacity under the special conditions of shorter working line length and narrower mining district width after the working line of the first mining district retracts to the mining right scope, based on the principle of technical feasibility and economic rationality, considering the influence of working line length on production stripping ratio, stripping haulage distance and raw coal production capacity, a mathematical model with the lowest annual stripping total cost as the goal was established, and the economic and reasonable working line length was determined to be 1620m～2315m.On this basis, further combined with the production capacity and equipment layout scheme of the available mining equipment in Haerwusu open-pit mine, it was determined that the annual average advancing speed of the working line was controlled within the feasible range of 400m～515.25m, and the working line length which can make the production capacity of the mining equipment fully exert was 1820m. Based on the analysis and optimization of the working line length determined by the feasible advancing speed of the working line, the Monte Carlo method was innovatively used to design the working line shape, and three working line layout and development schemes that met the requirements of the working line length and the annual advancing speed limit were proposed. Through the engineering deduction of the three schemes, a CRITIC-TOPSIS comprehensive evaluation model based on the objective weighting method was constructed by selected six key indexes, such as the average production stripping ratio, the weighted average haulage distance and lifting height of stripping, the weighted average haulage distance and lifting height of raw coal, and the average maximum advancing speed of working line. The evaluation results showed that scheme No.2 had the highest degree of closeness to the ideal solution, which can make Haerwusu Open-pit Coal Mine achieve the goal of 35Mt/a raw coal production capacity under the condition of narrow mining district with the best technical and economic benefits.

TD824?

国家自然科学基金项目（面上项目，重点项目，重大项目）