本文選題：離子型稀土礦 + 邊坡穩(wěn)定性��； 參考：《江西理工大學》2015年碩士論文

【摘要】：贛南作為南方離子型稀土礦的主要產區(qū)及發(fā)現地,儲量約占全國的三成。在離子型稀土礦開采中,廣泛使用原地浸礦開采工藝,受稀土的工程性質及開采方式的影響容易造成邊坡失穩(wěn)。因此,對稀土礦邊坡失穩(wěn)破壞進行研究是十分必要的。本文以贛縣大田稀土礦邊坡為研究對象,運用室內模擬浸泡試驗分析了該礦稀土土樣的工程性質;采用正交試驗法分析了邊坡穩(wěn)定性影響因素;在原地浸礦開采下,運用數值模擬方法分析了注液滲流條件下礦山邊坡孔隙水壓力的分布以及邊坡的穩(wěn)定性,并介紹了稀土邊坡防護措施。得出以下結論:(1)稀土土體在浸礦前后物理特性發(fā)生了變化。原地浸礦反應之后,土樣的平均顆粒直徑變化不大,但細小黏粒減少較多。浸礦前后,其密度變化不大。浸礦后,滲透性系數增加了十倍。粘聚力隨著浸礦時間的增加而減小,內摩擦角隨著浸礦時間的增加而增加,最后兩者都趨于穩(wěn)定。(2)對該研究礦山,選取一個坡面建立了計算模型,在天然狀態(tài)和浸礦后該邊坡均處于穩(wěn)定或基本穩(wěn)定狀態(tài),此時不會產生破壞,只是安全系數稍微有些下降。(3)影響離子型稀土邊坡穩(wěn)定性因素的主次順序依次為坡比、粘聚力、內摩擦角、坡高,其中坡比對邊坡的影響程度要大于其他三種因素。(4)稀土邊坡安全系數隨著注液時間的增加,總體上呈先減小后穩(wěn)定的趨勢。注液第1天至第15天,安全系數變化不明顯且均大于1.1,邊坡還位于穩(wěn)定的狀態(tài);但當注液到20天以后,穩(wěn)定性系數下降很快,第23天時,邊坡的安全系數已經小于1.05,說明邊坡在這個時候有破壞的可能。
[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.
【學位授予單位】：江西理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD824.7

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