本文選題：房柱采礦法 + 回采率��； 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：滇西某銅礦為緩傾斜～傾斜、薄～中厚～厚礦體,礦巖半堅硬～堅硬、中等穩(wěn)固～穩(wěn)固,礦體的形態(tài)變化大,在開采過程中存在護(hù)頂層易冒落、損失貧化大等問題。本文針對礦山開采中存在的問題,以KT2礦體礦為研究對象,采用現(xiàn)場調(diào)研、實驗室試驗、理論分析、數(shù)值模擬方法,對房柱采礦法的采場結(jié)構(gòu)參數(shù)進(jìn)行分析優(yōu)化,取得了如下研究成果:(1)查閱大量國內(nèi)外文獻(xiàn)資料,了解目前國內(nèi)外采場結(jié)構(gòu)參數(shù)優(yōu)化研究現(xiàn)狀;現(xiàn)場收集、調(diào)查、研究了礦床地質(zhì)條件,包括:礦床地質(zhì)構(gòu)造、礦床水文地質(zhì)、工程地質(zhì)等資料。(2)根據(jù)實際地質(zhì)資料,結(jié)合現(xiàn)場調(diào)研資料和室內(nèi)實驗得到了礦石和巖石的物理力學(xué)參數(shù),并運用強度準(zhǔn)則對其進(jìn)行折減,得出巖體的物理力學(xué)參數(shù),為后續(xù)分析研究提供了基礎(chǔ)數(shù)據(jù)。(3)運用厚跨比理論、荷載傳遞線理論、結(jié)構(gòu)力學(xué)梁理論、普氏壓力拱理論等對礦房極限跨度和護(hù)頂層厚度關(guān)系進(jìn)行研究,結(jié)合不同理論下的礦石回采率的matlab擬合曲線分析得出:礦房的極限跨度將隨著護(hù)頂層厚度的增加而增大,礦石回采率將隨著極限跨度的增加而減小,得出護(hù)頂層厚度為4米時,既能夠確保開采的安全,同時又具有較高的礦石回采率。(4)分別應(yīng)用形狀效應(yīng)理論、尺寸效應(yīng)理論、Lunder、Panakis礦柱強度公式并結(jié)合礦石回采率和礦柱安全系數(shù)計算出不同安全系數(shù)和礦石回采率時礦柱的最小邊長,并對礦柱的穩(wěn)定性進(jìn)行驗算,得出礦柱的邊長取4米、礦柱的間距7米為最優(yōu)。(5)以理論分析結(jié)果為依據(jù),運用有FLAC3D軟件建立數(shù)值模型,對優(yōu)化結(jié)果合理性進(jìn)行數(shù)值模擬分析驗證。結(jié)果表明,本文優(yōu)化分析結(jié)果基本合理可靠,具有較好的參考價值。本文綜合采用現(xiàn)場調(diào)研、實驗室試驗和理論分析、數(shù)值模擬方法,改進(jìn)了房柱法的采場結(jié)構(gòu),構(gòu)建了 KT2礦體三維力學(xué)模型,研究了不同結(jié)構(gòu)參數(shù)下的護(hù)頂層穩(wěn)定性和損失貧化規(guī)律,得到了合理的采場結(jié)構(gòu)參數(shù),并且驗證了參數(shù)的合理性。
[Abstract]:A copper mine in western Yunnan is a kind of orebody with a gentle inclination, thin to medium thickness ~ thick ore body, semi-hard ~ hard ore rock, medium solid ~ stable ore body, large changes in the shape of orebody, and problems such as the caving of the top layer and the large loss and dilution in the mining process. In this paper, aiming at the problems existing in mining, taking KT2 orebody as the research object, field investigation, laboratory test, theoretical analysis and numerical simulation method are adopted to analyze and optimize the stope structure parameters of the roof pillar mining method. The following research results are obtained: 1) referring to a large number of domestic and foreign literature to understand the present situation of research on optimization of stope structural parameters at home and abroad, collecting and investigating on site, studying the geological conditions of ore deposits, including: geological structure of ore deposits, hydrogeology of deposits, According to the actual geological data, the physical and mechanical parameters of ore and rock are obtained by combining field investigation data and laboratory experiments, and the physical and mechanical parameters of rock mass are obtained by using strength criterion. It provides basic data for further analysis and research.) the relationship between the limit span of mine house and the thickness of the roof is studied by using the theory of thick span ratio, the theory of load transfer line, the theory of structural mechanics beam and the theory of Presley pressure arch. According to the analysis of matlab fitting curve of ore recovery rate under different theories, it is concluded that the limit span of mine house will increase with the increase of the thickness of protective top layer, and the ore recovery rate will decrease with the increase of limit span. The theory of shape effect can be applied to ensure the safety of mining and at the same time have a high ore recovery rate. The size effect theory is used to calculate the minimum side length of the pillar when different safety factors and ore recovery rates are combined with the strength formula of Lunderan Panakis pillar and combining with ore recovery rate and pillar safety factor. The stability of ore pillar is checked and calculated, and the side length of ore pillar is obtained to be 4 meters. Based on the theoretical analysis results, the numerical model is established by using FLAC3D software, and the rationality of the optimized results is verified by numerical simulation. The results show that the results of the optimization analysis are reasonable and reliable and have good reference value. In this paper, the stope structure of the roof column method is improved by field investigation, laboratory test, theoretical analysis and numerical simulation, and the three-dimensional mechanical model of KT2 orebody is constructed. In this paper, the stability and loss dilution of the top layer under different structural parameters are studied, the reasonable stope structural parameters are obtained, and the rationality of the parameters is verified.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD862.1;TD853.32

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