昆钢马鞍山铁矿2号矿体露天开采境界圈定研究

发布时间：2018-10-11 08:31

【摘要】：国内外许多露天矿山在生产过程中由于开采条件和矿石市场行情变化等原因,原先设计中的露天开采境界已不适用于矿山现状,而一个合理的露天开采境界是矿山高效持续生产的前提,因此这些矿山需要重新研究圈定相应合理的露天开采境界来保证正常的开采生产[1]。金平昆钢马鞍山铁矿是昆钢集团下属的一个年产量30万t铁矿石的小型矿山,其2号矿体露天开采部分的设计对境界的圈定仅仅只是通过简单的类比经验法得出来的,目前矿山已开采至规划要求的最低标高附近。但是矿山在开采中发现,继续实行露采还会获得较大的经济效益,这和前期的开采设计要求的有所不同,矿山计划对规划深度以下的矿体继续采用露天开采,此时需要重新给2号矿体圈定一个符合实际情况的露天开采境界。基于此,本文就昆钢马鞍山铁矿2号矿体,借助以多元非线性回归法为基础的Design-expert软件和三维可视化软件3DMine,结合矿山实际情况,在综合考虑经济和安全的情况下,得到相对合理的开采深度和边坡角,最后借助3DMine为矿山圈定一个初步的最终开采境界:最终边坡角增大两度为48°、露天开采深度增加70m。同时为了保证科学的严谨性和为矿山提供最直观的此境界下的形成的最不稳定处露天边坡及其台阶对开挖后的相关力学响应情况,本文用FLAC3D软件模拟出此区域边坡,从具体的位移、应力和剪应变增量分布等情况来分析验证,进一步论证此露天开采境界在工程实际上的合理性。本文通过实际考察和数值模拟相结合的方法,为金平昆钢马鞍山铁矿2号矿体圈定出一个相对合理的露天开采境界,得出在最终边坡角增大两度为48°、露天开采深度增加70m。并用FLAC3D模拟此境界下的最不稳定边坡,从边坡具体的位移、应力等情况来分析此部位边坡对开挖后的力学响应情况,对于马鞍山铁矿在今后的露天开采生产中能起到一定的科学指导作用。
[Abstract]:In many open pit mines at home and abroad, due to the mining conditions and the changes in ore market prices during the production process, the previously designed open-pit mining boundary is no longer applicable to the present situation of mines. A reasonable open-pit mining boundary is the premise of efficient and continuous production, so these mines need to re-study and delineate the corresponding reasonable open-pit mining boundary in order to ensure normal mining production [1]. Maanshan Iron Mine of Jinpingkungang is a small mine with an annual output of 300000 tons of iron ore. The design of the open-pit mining part of No. 2 ore body of Jinpingkun Iron and Steel Co. At present, the mine has been mined to the minimum elevation required by the plan. However, in mining, it is found that the continuation of open-pit mining will also obtain greater economic benefits, which is different from the requirements of the previous mining design. The mine plans continue to adopt open-pit mining for ore bodies below the planned depth. At this point, it is necessary to redefine the No. 2 orebody as an open pit mining boundary in accordance with the actual situation. Based on this, based on the Design-expert software based on multivariate nonlinear regression method and 3D visualization software 3DMine3, considering the actual situation of the mine, this paper considers the economy and safety comprehensively for the No. 2 orebody of Maanshan Iron Mine of Kunming Iron and Steel Co. A relatively reasonable mining depth and slope angle are obtained, and a preliminary final mining boundary is determined by means of 3DMine: the final slope angle increases by two degrees to 48 掳, and the open pit mining depth increases by 70 m. At the same time, in order to ensure the scientific preciseness and provide the most intuitionistic open pit slope and its steps to the mechanical response after excavation, this paper simulates the slope in this area by FLAC3D software. The concrete displacement, stress and shear strain increment distribution are analyzed and verified, and the rationality of this open-pit mining boundary in engineering practice is further proved. By combining practical investigation with numerical simulation, a relatively reasonable open-pit mining boundary for No. 2 orebody of Ma'anshan Iron Mine of Jinpingkun Iron and Steel Co., Ltd is established in this paper. It is concluded that the final slope angle is increased twice to 48 掳and the depth of open-pit mining is increased by 70 m. FLAC3D is used to simulate the most unstable slope under this boundary. The mechanical response of the slope to the excavation is analyzed from the concrete displacement and stress of the slope. It can play a scientific guiding role in the future open-pit mining production of Maanshan Iron Mine.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD854;TD861.1

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