露天转地下开采边坡稳定性与防灾减灾技术研究

发布时间：2018-06-09 21:46

本文选题：露天转地下 + 边坡稳定性　；参考：《中南大学》2013年硕士论文

【摘要】：露天转地下开采时,露天边坡受复合采动效应影响,其变形与破坏规律变得复杂,其边坡的安全与稳定直接影响矿山的建设与生产安全,直接影响露天与地下开采转换过程的生产过渡。随着越来越多的矿山不断由露天转入地下及缺乏对露天转地下开采影响边坡的移动规律认识和缺乏对边坡防灾减灾的认识,地下开采引发边坡滑坡、坍塌等地质灾害频发生,严重影响了矿山的生产安全,给矿山边坡带来了巨大的维护费用和经济损失。因此,有必要开展露天转地下开采边坡的稳定性和防灾减灾治理研究。本文对露天转地下开采诱发边坡不稳定的影响规律进行了探讨,以安徽新桥硫铁矿露天转地下开采为工程背景,模拟分析了采动条件下对边坡的稳定性影响,并运用灾害链理论,构建了矿山边坡灾害链,探讨了露天转地下矿山边坡断链减灾的相关措施,最后对新桥硫铁矿露天边坡进行了防灾减灾治理。主要研究内容有： (1)在已有资料和文献调查的基础上,总结阐述了露天转地下开采边坡稳定性的影响因素,探讨了地下开采对边坡的稳定影响机理。 (2)对露天转地下开采诱发边坡不稳定的边坡安全影响规律运用FLAC3D进行了多模型的数值模拟研究,综合分析了不同开采位置、开采宽度、开采深度及挂帮矿开采等对边坡安全稳定的影响。 (3)完成了露天转地下开采边坡稳定性数值模型建立与计算,对边坡稳定性进行了分析。在矿山地质资料分析的基础上,利用岩石力学参数和建立的边坡三维几何模型,采用3Dmine-MIDAS/GTS-FLAC3D数值模拟耦合技术,建立了大型三维露天边坡复杂精确模型,探讨边坡不同空间相对位置边坡变形规律,分析了边坡的稳定性,结果表明：在最不利条件开采下边坡整体基本稳定,上盘边坡受地下开采扰动影响大于下盘边坡,最大沉降位移和应力主要位于坡脚处。 (4)应用灾害链理论,构建了露天转地下矿山边坡的灾害链；运用“孕源断链减灾”的思路,分析了边坡防灾减灾途径和措施,并对其系统的动力演化规律进行了分析与研究,最后对新桥硫铁矿矿山边坡进行了适当的防灾减灾治理。
[Abstract]:When opencast to underground mining, open-pit slope is affected by compound mining effect, its deformation and failure law becomes complicated, and the safety and stability of its slope directly affect the safety of mine construction and production. It directly affects the production transition of the conversion process between open pit and underground mining. With more and more mines moving from open pit to underground and lack of understanding of the movement law of slope affected by open-pit mining and lack of understanding of slope disaster prevention and mitigation, geological disasters such as slope landslide and collapse caused by underground mining occur frequently. It seriously affects the safety of mine production and brings huge maintenance cost and economic loss to mine slope. Therefore, it is necessary to carry out research on slope stability and disaster prevention and mitigation in open pit to underground mining. In this paper, the influence law of slope instability induced by open-pit to underground mining is discussed. Based on the engineering background of open-pit to underground mining of Xinqiao pyrite in Anhui Province, the influence of mining conditions on slope stability is simulated and analyzed. Based on the theory of disaster chain, the disaster chain of mine slope is constructed, and the relevant measures to reduce the broken chain of open pit to underground mine slope are discussed. Finally, the prevention and mitigation measures of open pit slope of Xinqiao pyrite are put forward. The main research contents are as follows: 1) on the basis of existing data and literature investigation, this paper summarizes and expounds the influencing factors of slope stability in open-pit to underground mining. The influence mechanism of underground mining on slope stability is discussed. The influence of mining depth and mining on slope safety and stability is discussed. The numerical model of slope stability of open-pit to underground mining is established and calculated, and the slope stability is analyzed. Based on the analysis of mine geological data, the complex and accurate 3D open slope model is established by using the rock mechanics parameters and the 3D geometric model of the slope, and by using the coupling technology of 3D mine-MIDAS-GTS-FLAC3D numerical simulation. The deformation law of slope in different space and relative position is discussed, and the stability of slope is analyzed. The results show that under the most unfavorable conditions, the slope is basically stable, and the upper side slope is more affected by underground mining disturbance than the bottom slope. The maximum subsidence displacement and stress are mainly located at the foot of the slope. The dynamic evolution law of the system is analyzed and studied. Finally, proper disaster prevention and mitigation treatment is carried out on the slope of Xinqiao pyrite mine.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD854.6;TD7

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