复杂破碎残矿回采结构模型及可靠性分析

发布时间：2018-03-24 04:37

  本文选题：安全工程　切入点：残矿回采　出处：《华南理工大学》2015年硕士论文

【摘要】：黄金矿产是国家的战略性资源,也是一种不可再生资源。随着黄金矿产资源的日渐枯竭,以及国内外市场对黄金需求的加大,残矿回采逐渐进入人们的视野。残矿回采多为老采空区周边作业,其工作面往往与老采空区、崩落区联通或紧邻。与正规开采相比,残矿回采具有更高的风险和技术难度。因此,开展残矿回采结构模型稳定性以及采场安全参数研究,对于减少生产安全事故,具有十分重要的实际意义。论文在国家“十二?五”科技支撑计划项目“大型金矿绿色采选冶技术研究及示范”(2012BAB08B00)的课题“复杂破碎金矿高效开采工艺技术”(2012BAB08B02)的支持下,以某大型黄金矿山整合矿区的残矿回采工程体为研究对象,以残矿体安全回采为目标,开展残矿回采结构模型稳定性以及采场安全参数研究。取得如下主要研究成果:(1)通过实地调研,掌握了整合矿区开采方式、残矿资源分布等基本情况,选取典型中段,借助Dimine矿山软件,构建了三维可视化矿体模型。三维可视化矿体模型表明,ZT5矿体的矿脉位于山脊之下,残矿资源整体上呈现出矿脉不完整、分布不均匀、赋存于采空区周边的特征;ZT8矿体的残矿厚度较薄,沿崩落区呈狭长或矩形状分布。(2)选取典型残矿回采工程体,构建了模型Ⅰ(单侧面和上部紧邻采空区)、模型Ⅱ(3个侧面和上部紧邻采空区)、模型Ⅲ(单一侧面紧邻采空区)等3个残矿回采结构模型,充分反映了残矿回采工程体的赋存环境。(3)引入完整性指数对岩体抗拉强度进行折减,运用结构力学梁理论分析和数值分析两种方法,对3个残矿回采结构模型的稳定性进行综合判定。稳定性综合判定表明,模型Ⅰ和模型Ⅱ处于稳定状态;模型Ⅲ处于不稳定状态。(4)运用Monte Carlo法和Paloheimo法对3个残矿回采结构模型进行可靠性分析,确定残矿回采工程体在探采中的采场安全参数。结果表明,1)模型Ⅰ。当设计采场跨度不变、向上回采拟采矿块时,应保证顶板的安全厚度大于14m;当设计采场厚度不变,沿跨度方向回采拟采矿体时,应保证采场的安全跨度小于29m;2)模型Ⅱ。当悬梁跨度不变时,回采过程中应保证顶板的悬梁厚度大于23m;3)模型Ⅲ。当设计采场顶板厚度不变,沿跨度方向回采矿体时,应保证采场的安全跨度小于70m。(5)整合矿区地表沉降监测结果表明,截至2013年9月,地表位移变形已趋于稳定,岩体自重应力场已趋于平衡。典型残矿工程体的试验开采表明,模型Ⅰ对应的试验采场处于稳定状态;模型Ⅱ对应的岩体处于稳定状态;模型Ⅲ对应的试验采场发生失稳破坏。与结构模型稳定性分析结果基本一致。
[Abstract]:Gold mineral is a national strategic resource and also a non-renewable resource. With the depletion of gold mineral resources and the increasing demand for gold in the domestic and foreign markets, The residual mining has gradually entered the people's visual field. The residual mining is mostly the operation around the old goaf, and its working face is often connected with or adjacent to the old goaf and caving area. Compared with the normal mining, the mining face of the mining face is usually connected with or adjacent to the old goaf, caving area and normal mining. Residual mining has higher risk and technical difficulty. Therefore, it is of great practical significance to study the stability of stope structure model and stope safety parameters for reducing production safety accidents. Supported by the research and demonstration of green mining and metallurgy technology for large-scale gold deposits in the "Science and Technology support Plan Project", "High efficiency mining technology for complex broken gold deposits" (2012BAB08B02), Taking the residual mining engineering body of a large gold mine integrated mining area as the research object, and taking the safety mining of the residual ore body as the target, The stability of stope structure model and safety parameters of stope are studied. The main research results are as follows: 1) through field investigation, we master the basic conditions of integrating mining mode and residual resource distribution, and select the typical middle section. With the help of Dimine software, a 3D visual orebody model is constructed. The 3D visual orebody model shows that the veins of the ZT5 orebody are located below the ridge, and the residual resources are incomplete and unevenly distributed on the whole. The ZT8 orebody, which occurs around the goaf, is thin in thickness and has a narrow or rectangular distribution along the caving area. Three residual mining structure models, model 鈪，

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