Optimization Research On Mining Section Dividing And Transition For Huolin River No.1 Open-pit Mine

In recent years, China’s coal industry entered the new period of the excess capacity, bearish market and urgent need to transformation, which means as to open-pit mining, high efficient mining and green mining is imperative. The paper based on principles of reducing production cost, improving the recovery rate of resources and ensuring the stable and continuous development of open-pit coal mine, elaborated the significance of the optimization study on mining sections dividing and transition of Huolin River No.1 open-pit coal mine. The established research objects have been accomplished mainly through the theoretical analysis and mathematical modeling with the combination of open-pit mining theory and model analysis, economics, the combination of theory and practice and mining systems engineering theory integratedly applied.For the optimization study on mining sections dividing and mining sequence of Huolin River No.1 open-pit coal mine, the work-line length with technical feasibility and economically rationality has been determined as 2500 m through classical model formula on the premise of the mine’s production status. Combined with the present situation of mining sections dividing, two optimization schemes of mining section dividing and mining sequence that the northern 3rd mining section horizontal mining & re-digging ditch were put forward based on optimization criterion. During the scheme optimization process, production technical and economic indicators were calculated, the harmony between each mining sections were qualitatively analyzed. The evaluation system which was constitutive of five indicators was established. The mathematical optimization model of mining sections dividing and mining sequence was established based on Delphi-TOPSIS. In the end, the first scheme that the northern 3rd mining section horizontal mining & re-digging ditch was determined as the optimal through the theoretical analysis together with mathematical model.For the optimization study on the northern 3rd mining section transition, based on optimization principles and influence factors of mining transition mode together with the optimal scheme of mining section dividing and mining sequence, the optimal inner dump mode was preferentially determined. The optimal ditch height between the south and north mine was determined as 96.82 m and that of the northern 3rd mining section was 72.38 m through the optimization model of the optimal ditch height considering the constraint of ditch height caused by the capacity of inner dump. And then, during the optimization process of mining section transition mode, based on the fuzzy mathematical method, the optimization model was established with 12 indexes which were selected from 3 aspects that production stability, technical management and economic benefit. Considering the optimal scheme of mining section dividing and mining sequence, the mode of work-slope changing gradually with ditch was determined as the optimal transition mode of the northern 3rd mining section.For the optimization study on the south mine’s southern mining section transition, the paper analyzed issues during its close period, determined the train of thought that solving issues through optimizing working-line arrangement forms under the condition that common mining section transition modes were not applicable. Based on principals that speeding up deepening of the southern mining section, realizing the inner dump with the least delay possible and ensuring smooth transition of mining sections in the south mine, 3 feasible schemes including crosswise arrangement, slant arrangement and short working-line vertical mining were put forward. Selecting 9 relevant indexes, the working-line slant arrangement was determined as the optimal scheme through the optimization model established based on the set pair analysis method.