Optimization Study Of Mining Method Of The Steep Soft Footwall Iron Ore Body

Steep bottom wall broken ore body mining, often because of mining methodselection is undeserved, stope structure parameters and stoping sequence unreasonable,so that ore loss and dilution increase, and even cause the scale of the stope groundpressure activity, to the safety of the stope production operation causing serious threat,so strengthening steep bottom wall broken ore body safe high-efficient exploitationresearch in China to improve this kind of ore body mining technology level, and builda resource-conserving and environment-friendly mining plays an important role inpushing, and based on the rational stope structure parameters and stoping sequencemining method in this kind of ore body mining in appear particularly important. Basedon the steep thick big bottom wall broken LiGuanJi iron ore body as the researchobject, using comprehensive fuzzy mathematics theory, experience analysis, numericalsimulation analysis methods for steep ore body mining of mining method, stopestructure parameters and stope stoping sequence to do in-depth research, the mainresearch content is as follows:(1) Analysis in this paper shows that the LiGuanJi iron ore body miningtechnological conditions, and combining the actuality of mine production andengineering analysis of the status of LiGuanJi iron ore is summarized the existingproblems.(2) Introduced the mining method optimized selection research’ present situation,the union LiGuanJi iron ore body actual situation, through the different program oftechnical and economic index and advantages and disadvantages of contrast,combining the fuzzy comprehensive evaluation method of each scheme in the comprehensive comparison, it is concluded that Ⅳscheme (point pillar type cut andfill stoping) for this mine currently the optimal mining scheme.(3) Combined with the actual conditions of the ore body occur, mining technicalcondition and the selection of mining method, design a variety of different schemethrough FLAC3D numerical simulation analysis software of stope structure parametersand stoping sequence are optimized, and through the twelve numerical simulationscheme, it is concluded that different stope structure parameters of stope surroundingrock under the condition of the stress and displacement change situation, schemecomparison results show that scheme six column size5m x5m, point column centerspacing15m for the optimum scheme; Through the three different stoping sequence ofnumerical simulation, it can be seen that the side to the other side of the stopingsequence for optimal stoping sequence.(4) According to the stope structure parameters and stoping sequence optimizationresults, combining site column cut and fill stoping process characteristics, this paperintroduces the mining methods technology and stope drilling, blasting, ventilation,transportation, packing, etc, and combined with the characteristics of the ore bodyfootwall soft broken, determined the different filling body stope of different strengthand packing way.