本文選題：原地浸礦 + 離子型稀土礦　； 參考：《江西理工大學(xué)》2015年碩士論文

【摘要】：原地浸礦施工條件下稀土礦邊坡穩(wěn)定性是一個時間域、空間域上的復(fù)雜的力學(xué)問題,雖然原地浸礦施工方法在離子型稀土礦開采中得到廣泛的應(yīng)用,但人們對原地浸礦如何影響稀土礦邊坡穩(wěn)定性的研究還很不足。本文依據(jù)某離子型稀土礦邊坡實例,分析了原地浸礦條件下影響邊坡穩(wěn)定性的主要因素。在上述基礎(chǔ)上,介紹了當前分析邊坡穩(wěn)定性的幾種主流方法,并采用考慮地下水影響的條分法對稀土礦邊坡進行了安全系數(shù)的計算;采用有限差分軟件FLAC3D對不同浸礦時間下的稀土礦穩(wěn)定性進行了數(shù)值模擬,得到了不同浸礦時間條件下稀土礦邊坡應(yīng)力場、位移場、應(yīng)變增量場和滲流場等數(shù)據(jù),分析了浸礦時間對邊坡穩(wěn)定性的影響;對植被護坡方案進行了模擬和分析,探討了植被護坡方案對孔隙水壓力、淺層安全性和深層安全性的影響,得到主要結(jié)論如下:(1)導(dǎo)致原地浸礦邊坡滑動失穩(wěn)的原因較多,主要包括浸礦溶液與表土的化學(xué)反應(yīng)、稀土礦處于亞飽和狀態(tài)下的降雨作用和稀土礦物理力學(xué)參數(shù)隨注漿時間的變化等;(2)采用考慮了地下水影響的條分法對原地浸礦施工不同時間時邊坡安全系數(shù)進行了計算,得到了不同時刻的邊坡安全系數(shù),結(jié)果表明前期安全系數(shù)減小不大,10天后安全系數(shù)降低到1以下,邊坡處于不安全狀態(tài);(3)采用強度折減法對浸礦邊坡進行了安全系數(shù)的求解,結(jié)果表明:未浸礦施工時,邊坡安全系數(shù)為1.67;浸礦施工1、2、5、10和15天時,對應(yīng)的安全系數(shù)分別為1.63、1.60、1.55、1.11和0.97;可以認為浸礦施工相當于一個緩慢的滲流作用,隨著浸礦時間的增長,土體逐漸變成飽和狀態(tài),并且土體的物理力學(xué)參數(shù)也不斷減小,使得邊坡從穩(wěn)定狀態(tài)變成不穩(wěn)定狀態(tài);(4)通過對植被防護方案分析可以確定:植被防護改變了稀土礦邊坡孔隙水壓力的分布情況,提高了邊坡淺層的安全性,對深層安全性影響不顯著。
[Abstract]:The slope stability of rare earth ore under in-situ leaching is a complex mechanical problem in time domain and space domain, although the construction method of in-situ leaching is widely used in ion rare earth mining. However, the study of how in situ leaching affects the slope stability of rare earth ore is still insufficient. Based on an example of an ion rare earth ore slope, the main factors affecting slope stability under in-situ leaching are analyzed in this paper. On the basis of the above, several main methods of slope stability analysis are introduced, and the safety factor of rare earth ore slope is calculated by using the strip method considering the influence of groundwater. The stability of rare earth ore under different leaching time is simulated by finite difference software FLAC3D. The stress field, displacement field, strain increment field and seepage field of rare earth ore slope under different leaching time are obtained. The influence of leaching time on slope stability is analyzed, and the effects of vegetation slope protection scheme on pore water pressure, shallow layer safety and deep layer safety are discussed. The main conclusions are as follows: (1) there are many reasons for the slippage instability of in-situ leaching slope, mainly including the chemical reaction between leaching solution and topsoil. The effect of rainfall on rare earth ore under the condition of sub-saturation and the variation of physical and mechanical parameters of rare earth ore with grouting time etc.) the slope safety factor under different time of in-situ leaching is calculated by using the strip method which takes into account the influence of groundwater. The safety factor of slope at different times is obtained. The results show that the safety factor of the slope is reduced to less than 1 after 10 days. The slope is in unsafe condition and the strength reduction method is used to solve the safety factor of the leachate slope. The results show that the safety factor of the slope is 1.67 when the ore is not leached, the safety factor of the slope is 1.63 ~ 1.601. 60 / 1. 55 / 1. 11 and 0. 97 respectively when the leaching is 1 ~ 2 ~ 2 ~ 5 ~ 5 ~ 5 ~ 10 and 15 days, respectively. It can be considered that the leaching construction is equivalent to a slow seepage effect, which increases with the leaching time. The soil gradually becomes saturated, and the physical and mechanical parameters of the soil decrease continuously. Through the analysis of vegetation protection scheme, it can be determined that vegetation protection has changed the distribution of pore water pressure of rare earth mine slope and improved the safety of slope shallow layer. The effect on deep safety is not significant.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD854.6

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