某露天矿采场边坡稳定性分析应用研究

发布时间：2018-08-20 09:14

【摘要】：露天采场矿边坡工程是以岩体为工程材料和工程结构。采矿作业为施工手段而形成的大型岩体工程。随着露天开采深度的增加,边坡高度不断加大,逐步形成高陡露天边坡,使采掘生产、边坡维护难度不断加大。所以如何对边坡矿边坡进行合理的稳定性分析逐渐成专门的研究课题。本文的主要工作为以青海某露天矿采场边坡工程为研究对象,着重研究其稳定性分析,其次根据稳定性分析结果提出针对性的合理的治理意见,以保障矿山的安全生产。本文重点研究稳定性分析两个主要问题,一是如何获取岩体的力学参数,本文采用费辛柯法、格吉法、经验参数法对土工试验成果进行分析、统计、类比,获得了边坡稳定性分析计算所用的摩尔-库伦模型基本参数。另一问题是稳定性分析的方法选择,本文首先通过已有的地质灾害、地质勘探资料、土工试验基础上,对采场边坡进行工程地质分区,结合野外观察综合给定了边坡的破坏模式,通过目前常用的余推力法、简化Bishop法进行边坡的稳定性分析计算得出边坡稳定安全系数,通过单纯形加速法等潜在滑动面的优化方法确定潜在滑动面,分别对现状、原设计、调整边坡结构参数后的边坡稳定性分析计算得出安全系数和潜在滑动面。同时通过采用强度折减有限元法(ABAQUS数值分析软件)对边坡进行静态的稳定性分析,通过边坡应力应变数值分析,定量地给出了铜矿边坡应力集中部位及应力应变水平,为边坡稳定状态的又一定量评价指标。通过强度折减有限元法、极限平衡法在边坡稳定性计算结果进行分析比较,得出了一致的结论。最后根据稳定情况简单讨论了经济合理的工程对策。本文的研究结果对采场的稳定性及后续生产具有实际意义。
[Abstract]:The slope engineering of open pit stope takes rock mass as engineering material and engineering structure. A large rock mass project formed by mining operations as a means of construction. With the increase of the depth of open-pit mining, the slope height is increasing, and the high and steep open-pit slope is gradually formed, which makes the excavation production and slope maintenance more difficult. Therefore, how to analyze the slope stability gradually becomes a special research topic. The main work of this paper is to take the slope engineering of an open pit mine in Qinghai as the research object, focusing on the analysis of its stability, and then, according to the results of the stability analysis, to put forward some pertinent and reasonable management opinions in order to ensure the safety of mine production. This paper focuses on two main problems of stability analysis. One is how to obtain the mechanical parameters of rock mass. In this paper, the results of geotechnical tests are analyzed, counted, and compared with the results of geotechnical tests by using Fisinco method, Gigi method and empirical parameter method. The basic parameters of the Moll-Coulomb model used in slope stability analysis are obtained. The other problem is how to choose the method of stability analysis. Firstly, based on the existing geological hazards, geological exploration data and geotechnical tests, engineering geological zoning of stope slope is carried out in this paper. Combined with the field observation, the failure mode of the slope is comprehensively given, and the slope stability safety coefficient is obtained by simplified Bishop method and the residual thrust method, which is commonly used at present. The potential slip surface is determined by the optimization method of simplex acceleration method, and the safety factor and potential sliding surface are calculated by analyzing and calculating the slope stability after the current situation, original design and adjustment of slope structural parameters. At the same time, the static stability analysis of the slope is carried out by using the strength reduction finite element method (ABAQUS), and the stress concentration and stress strain level of the copper slope are quantitatively given through the numerical analysis of the slope stress and strain. It is also a certain evaluation index of slope stability. By means of strength reduction finite element method and limit equilibrium method, the results of slope stability calculation are analyzed and compared, and a consistent conclusion is drawn. Finally, the economic and reasonable engineering countermeasures are briefly discussed according to the stable situation. The results of this paper have practical significance for stope stability and subsequent production.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD854.6

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