云南某铜矿房柱法采场结构参数优化研究

发布时间：2018-05-29 12:31

本文选题：房柱采矿法 + 回采率　；参考：《昆明理工大学》2017年硕士论文

【摘要】：滇西某铜矿为缓倾斜～倾斜、薄～中厚～厚矿体,矿岩半坚硬～坚硬、中等稳固～稳固,矿体的形态变化大,在开采过程中存在护顶层易冒落、损失贫化大等问题。本文针对矿山开采中存在的问题,以KT2矿体矿为研究对象,采用现场调研、实验室试验、理论分析、数值模拟方法,对房柱采矿法的采场结构参数进行分析优化,取得了如下研究成果:(1)查阅大量国内外文献资料,了解目前国内外采场结构参数优化研究现状;现场收集、调查、研究了矿床地质条件,包括:矿床地质构造、矿床水文地质、工程地质等资料。(2)根据实际地质资料,结合现场调研资料和室内实验得到了矿石和岩石的物理力学参数,并运用强度准则对其进行折减,得出岩体的物理力学参数,为后续分析研究提供了基础数据。(3)运用厚跨比理论、荷载传递线理论、结构力学梁理论、普氏压力拱理论等对矿房极限跨度和护顶层厚度关系进行研究,结合不同理论下的矿石回采率的matlab拟合曲线分析得出:矿房的极限跨度将随着护顶层厚度的增加而增大,矿石回采率将随着极限跨度的增加而减小,得出护顶层厚度为4米时,既能够确保开采的安全,同时又具有较高的矿石回采率。(4)分别应用形状效应理论、尺寸效应理论、Lunder、Panakis矿柱强度公式并结合矿石回采率和矿柱安全系数计算出不同安全系数和矿石回采率时矿柱的最小边长,并对矿柱的稳定性进行验算,得出矿柱的边长取4米、矿柱的间距7米为最优。(5)以理论分析结果为依据,运用有FLAC3D软件建立数值模型,对优化结果合理性进行数值模拟分析验证。结果表明,本文优化分析结果基本合理可靠,具有较好的参考价值。本文综合采用现场调研、实验室试验和理论分析、数值模拟方法,改进了房柱法的采场结构,构建了 KT2矿体三维力学模型,研究了不同结构参数下的护顶层稳定性和损失贫化规律,得到了合理的采场结构参数,并且验证了参数的合理性。
[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.
【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】：TD862.1;TD853.32

【参考文献】