赣南某离子型稀土矿原地浸矿边坡稳定性分析

发布时间：2018-05-31 00:42

本文选题：离子型稀土矿 + 边坡稳定性　；参考：《江西理工大学》2015年硕士论文

【摘要】：赣南作为南方离子型稀土矿的主要产区及发现地,储量约占全国的三成。在离子型稀土矿开采中,广泛使用原地浸矿开采工艺,受稀土的工程性质及开采方式的影响容易造成边坡失稳。因此,对稀土矿边坡失稳破坏进行研究是十分必要的。本文以赣县大田稀土矿边坡为研究对象,运用室内模拟浸泡试验分析了该矿稀土土样的工程性质;采用正交试验法分析了边坡稳定性影响因素;在原地浸矿开采下,运用数值模拟方法分析了注液渗流条件下矿山边坡孔隙水压力的分布以及边坡的稳定性,并介绍了稀土边坡防护措施。得出以下结论:(1)稀土土体在浸矿前后物理特性发生了变化。原地浸矿反应之后,土样的平均颗粒直径变化不大,但细小黏粒减少较多。浸矿前后,其密度变化不大。浸矿后,渗透性系数增加了十倍。粘聚力随着浸矿时间的增加而减小,内摩擦角随着浸矿时间的增加而增加,最后两者都趋于稳定。(2)对该研究矿山,选取一个坡面建立了计算模型,在天然状态和浸矿后该边坡均处于稳定或基本稳定状态,此时不会产生破坏,只是安全系数稍微有些下降。(3)影响离子型稀土边坡稳定性因素的主次顺序依次为坡比、粘聚力、内摩擦角、坡高,其中坡比对边坡的影响程度要大于其他三种因素。(4)稀土边坡安全系数随着注液时间的增加,总体上呈先减小后稳定的趋势。注液第1天至第15天,安全系数变化不明显且均大于1.1,边坡还位于稳定的状态;但当注液到20天以后,稳定性系数下降很快,第23天时,边坡的安全系数已经小于1.05,说明边坡在这个时候有破坏的可能。
[Abstract]:As the main producing area and discovery area of ion rare earth ore in south Jiangxi province, the reserves account for about 30% of the country. In the ion type rare earth mining, the in situ leaching mining technology is widely used, which is easy to cause slope instability due to the influence of rare earth engineering properties and mining methods. Therefore, it is necessary to study the instability failure of rare earth ore slope. Taking the slope of Datian rare earth mine in Ganxian County as the research object, the engineering properties of the rare earth soil sample of the mine are analyzed by laboratory simulated soaking test, the influencing factors of slope stability are analyzed by orthogonal test method, and the influence factors of slope stability are analyzed under in-situ leaching mining. The distribution of pore water pressure and the stability of mine slope under the condition of liquid injection seepage are analyzed by numerical simulation method, and the protection measures of rare earth slope are introduced. The following conclusions are drawn: 1) the physical properties of rare earth soil have changed before and after leaching. After in-situ leaching reaction, the average particle diameter of the soil sample changed little, but the fine clay decreased more. The density changes little before and after leaching. After leaching, the permeability coefficient increased tenfold. The cohesive force decreases with the increase of leaching time, and the internal friction angle increases with the increase of leaching time. Finally, both of them tend to be stable. In the natural state and after leaching, the slope is in a stable or basic stable state, and it will not be destroyed at this time, but the safety factor is slightly reduced. 3) the order of the factors affecting the stability of the ion rare earth slope is the slope ratio, the cohesion force, the order of the factors affecting the stability of the ion type rare earth slope. The angle of internal friction and slope height, in which slope ratio is greater than the other three factors, the safety factor of rare earth slope decreases first and then stabilizes with the increase of liquid injection time. From day 1 to day 15, the change of safety factor is not obvious and is greater than 1.1, and the slope is still in a stable state. However, after 20 days of injection, the coefficient of stability decreases rapidly, and on the 23rd day, The safety factor of the slope is less than 1.05, which indicates that the slope may be damaged at this time.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD824.7

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