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露天地下联合开采的矛盾是影响大红山铁矿大规模开采的最重要影响因素。为了在深部二期工程中缓解与消除联合开采的矛盾,设计的衔接开采方案重点是把上覆岩层的岩移角提高至70°,导致矿山面临露采边坡稳定性与高落差分段应力集中等主要地压问题。数值模拟与相似材料模拟试验研究均表明按70°移动角重新划定深部二期工程可采范围是可行的。为了确保生产安全和指导采矿,矿山建立了微震监测系统、地表变形监测系统与应力监测等综合地压监测系统。地表变形与微震监测初期结果表明,深部一期工程的上覆岩层塌陷角为75.4°~87.2°,监测数据进一步证实深部二期工程可采范围的可行性,研究成果对矿山的稳定发展具有重要意义。
The contradiction between open-pit and underground mining is the most important factor affecting the large-scale mining of Dahongshan Iron Mine. In order to mitigate and eliminate the contradiction between the joint mining in the deep second phase project, the key project of the cohesive mining design is to raise the rock migration angle of the overlying rock strata to 70 °, causing the mine to face the stability of open pit slope and high differential section stress Concentration and other major pressure problems. Numerical simulations and simulations of similar materials indicate that it is feasible to redefine the recoverable range of Deep Phase II Project by 70 ° movement angle. In order to ensure the safety of production and guide the mining, the mine has set up a comprehensive ground pressure monitoring system such as microseismic monitoring system, surface deformation monitoring system and stress monitoring. The preliminary results of surface deformation and microseismic monitoring indicate that the overburden collapse angle of the deep phase I project is 75.4 ° ~ 87.2 °. The monitoring data further confirm the feasibility of the recoverable range of the deep second phase project and the research results are of great importance to the stable development of the mine significance.