發(fā)布時間：2018-10-11 08:31

【摘要】：國內(nèi)外許多露天礦山在生產(chǎn)過程中由于開采條件和礦石市場行情變化等原因,原先設計中的露天開采境界已不適用于礦山現(xiàn)狀,而一個合理的露天開采境界是礦山高效持續(xù)生產(chǎn)的前提,因此這些礦山需要重新研究圈定相應合理的露天開采境界來保證正常的開采生產(chǎn)[1]。金平昆鋼馬鞍山鐵礦是昆鋼集團下屬的一個年產(chǎn)量30萬t鐵礦石的小型礦山,其2號礦體露天開采部分的設計對境界的圈定僅僅只是通過簡單的類比經(jīng)驗法得出來的,目前礦山已開采至規(guī)劃要求的最低標高附近。但是礦山在開采中發(fā)現(xiàn),繼續(xù)實行露采還會獲得較大的經(jīng)濟效益,這和前期的開采設計要求的有所不同,礦山計劃對規(guī)劃深度以下的礦體繼續(xù)采用露天開采,此時需要重新給2號礦體圈定一個符合實際情況的露天開采境界�；诖�,本文就昆鋼馬鞍山鐵礦2號礦體,借助以多元非線性回歸法為基礎的Design-expert軟件和三維可視化軟件3DMine,結合礦山實際情況,在綜合考慮經(jīng)濟和安全的情況下,得到相對合理的開采深度和邊坡角,最后借助3DMine為礦山圈定一個初步的最終開采境界:最終邊坡角增大兩度為48°、露天開采深度增加70m。同時為了保證科學的嚴謹性和為礦山提供最直觀的此境界下的形成的最不穩(wěn)定處露天邊坡及其臺階對開挖后的相關力學響應情況,本文用FLAC3D軟件模擬出此區(qū)域邊坡,從具體的位移、應力和剪應變增量分布等情況來分析驗證,進一步論證此露天開采境界在工程實際上的合理性。本文通過實際考察和數(shù)值模擬相結合的方法,為金平昆鋼馬鞍山鐵礦2號礦體圈定出一個相對合理的露天開采境界,得出在最終邊坡角增大兩度為48°、露天開采深度增加70m。并用FLAC3D模擬此境界下的最不穩(wěn)定邊坡,從邊坡具體的位移、應力等情況來分析此部位邊坡對開挖后的力學響應情況,對于馬鞍山鐵礦在今后的露天開采生產(chǎn)中能起到一定的科學指導作用。
[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and the changes in ore market prices during the production process, the previously designed open-pit mining boundary is no longer applicable to the present situation of mines.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 擄, 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 擄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.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD854;TD861.1

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