本文選題：原地浸礦　切入點：導(dǎo)流孔　出處：《江西理工大學(xué)》2017年碩士論文

【摘要】：目前,對導(dǎo)流孔周滲流規(guī)律理論研究不足,缺乏相應(yīng)的技術(shù)指導(dǎo),導(dǎo)致只憑經(jīng)驗布置導(dǎo)流孔,造成部分浸出液無法回收,同時因裂隙滲漏,導(dǎo)致相當部分浸出液流失,使得稀土回收率低,給礦區(qū)生活帶來極大的危害和污染。故研究導(dǎo)流孔周滲流規(guī)律,對計算原地浸礦母液回收率具有重要意義。本文利用原地浸礦室內(nèi)模型試驗,分析單個和密集導(dǎo)流孔周滲流規(guī)律。首先,利用單個導(dǎo)流孔周水平方向孔隙水壓力分布規(guī)律和導(dǎo)流孔收液率與底板滲漏量關(guān)系分析單個導(dǎo)流孔周滲流規(guī)律;其次,運用分形理論,推導(dǎo)出單個導(dǎo)流孔周水平方向孔隙水壓力分形分布表達式,并將實測單個導(dǎo)流孔孔周孔隙水壓力分布運用該式擬合,確定分形參數(shù);最后,利用不同間距、不同初始水頭條件下,密集導(dǎo)流孔周水平方向孔隙水壓力分布規(guī)律、導(dǎo)流孔收液率的控制過程和孔周水平方向和豎直方向水力梯度變化規(guī)律來分析密集導(dǎo)流孔周滲流規(guī)律,綜合考慮水平與豎直方向水力梯度之比對收液率的影響,為合理確定孔間距提供參考。結(jié)論如下:(1)單個導(dǎo)流孔周水平方向孔隙水壓力分布規(guī)律為在導(dǎo)流孔兩側(cè)形成大致呈對稱狀的降落漏斗,靠近導(dǎo)流孔孔隙水壓力值較低,遠離導(dǎo)流孔孔隙水壓力值較高,離導(dǎo)流孔越近孔隙水壓力值下降越快,且很快接近導(dǎo)流孔,底面曲率很小,水面線較為平緩,確定單個導(dǎo)流孔影響范圍為22cm。(2)根據(jù)分形理論,假設(shè)水沿水平方向進入導(dǎo)流孔的通道為普遍存在的2分叉分形樹狀網(wǎng)絡(luò)結(jié)構(gòu),基于Hagen-Poiseuille方程,提出單個導(dǎo)流孔周水平方向孔隙水壓力分形分布表達式及其分形參數(shù)計算方法,室內(nèi)模型試驗表明該計算公式有效可行。(3)隨初始水頭增加,描述樹狀分叉網(wǎng)絡(luò)的各級圓管分形參數(shù)長度比逐漸增加,且增加幅度越來越小;但是各級圓管的直徑比和初級母管長度逐漸減小,并漸趨穩(wěn)定,各級圓管直徑比的穩(wěn)定值為0.84。(4)影響導(dǎo)流孔收液率的根本因素是水力梯度,分析不同間距條件下,密集導(dǎo)流孔周水平和豎直方向水力梯度變化規(guī)律,綜合考慮導(dǎo)流孔周水平與豎直方向水力梯度之比對收液率的影響,得出當水平-豎直水力梯度之比達到2.26時,收液率達到最大值為73.7%。
[Abstract]:At present, the theoretical study on the percolation law around the diversion hole is insufficient and the corresponding technical guidance is lacking, which leads to the arrangement of the diversion hole only by experience, which results in the partial leaching fluid being unable to be recovered, and at the same time, due to the leakage of the fissure, a considerable part of the leaching fluid is lost.The recovery rate of rare earth is low, which brings great harm and pollution to the life of mining area.Therefore, it is of great significance to study the percolation law around the diversion hole for calculating the recovery rate of in-situ leaching mother liquor.In this paper, in situ leaching laboratory model tests are used to analyze the percolation law around single and dense diversion holes.Firstly, the distribution of pore water pressure in the horizontal direction around a single diversion hole and the relationship between the liquid recovery rate of the diversion hole and the leakage amount of the bottom plate are used to analyze the percolation law around a single diversion hole; secondly, the fractal theory is used to analyze the percolation law around a single diversion hole.The fractal expression of pore water pressure distribution in horizontal direction around a single diversion pore is derived, and the fractal parameters are determined by fitting the measured pore water pressure distribution around a single diversion hole.Under different initial water head conditions, the distribution of pore water pressure in the horizontal direction around the dense diversion hole, the control process of the fluid recovery rate of the diversion hole and the variation of the hydraulic gradient in the horizontal and vertical direction of the orifice are analyzed to analyze the percolation law around the dense diversion hole.The effect of the ratio of horizontal and vertical hydraulic gradient on the recovery rate is considered synthetically, which provides a reference for the reasonable determination of pore spacing.The conclusion is as follows: (1) the distribution of pore water pressure in the horizontal direction around a single diversion pore is characterized by the formation of a roughly symmetrical drop funnel on both sides of the diversion hole, the lower pore water pressure near the diversion hole, and the higher pore water pressure far away from the diversion hole.The closer the pore water pressure is to the diversion hole, the faster the pressure decreases, and the closer it is to the diversion hole. The curvature of the bottom surface is very small and the water surface line is relatively smooth. The influence range of a single diversion hole is determined to be 22 cm. 2) according to fractal theory,Assuming that the channel of water entering the diversion hole along the horizontal direction is the universal two-bifurcation fractal tree network structure, based on the Hagen-Poiseuille equation, the expression of the fractal distribution of pore water pressure in the horizontal direction of a single diversion hole and the calculation method of its fractal parameters are presented.The indoor model tests show that the formula is effective and feasible. With the increase of the initial water head, the ratio of fractal parameter length to fractal parameters of the tree-like bifurcation network increases gradually, and the increasing amplitude is smaller and smaller.However, the diameter ratio and the primary length of the tube are gradually decreasing, and gradually stabilizing. The stable value of the diameter ratio of the different grades is 0.84.40)) the hydraulic gradient is the fundamental factor affecting the liquid recovery rate of the diversion hole, and the hydraulic gradient is analyzed under different spacing conditions.The variation of hydraulic gradient in the vertical and horizontal direction of the dense diversion hole is studied. Considering the influence of the ratio of the horizontal to the vertical hydraulic gradient, it is concluded that when the ratio of horizontal to vertical hydraulic gradient reaches 2.26,The maximum recovery rate was 73.7%.
【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】：2017
【分類號】：TD865

【參考文獻】

相關(guān)期刊論文 前10條

1 李少龍;朱國勝;定培中;吳慶華;盛小濤;;岸坡水平排水孔的滲流場數(shù)值模擬[J];長江科學(xué)院院報;2017年02期

2 盛小濤;顧纈琴;定培中;李少龍;朱國勝;嚴敏;;岸坡水平排水孔現(xiàn)場試驗及地下水監(jiān)測成果分析[J];長江科學(xué)院院報;2017年02期

3 宋白雪;陳立;張發(fā)旺;陳亮;李華耀;;分形理論研究采動裂隙演化規(guī)律[J];工程勘察;2017年01期

4 楊連枝;何蕃民;高陽;;模擬排水孔列滲流行為的以溝代孔列延長滲徑法研究[J];巖土力學(xué);2017年01期

5 劉昕業(yè);李德武;;排水盲管間距對隧道排水量與隧道所受應(yīng)力影響的研究[J];工業(yè)設(shè)計;2016年10期

6 胡世麗;洪本根;王觀石;羅嗣海;;離子型稀土礦土壤有效孔徑及其分布參數(shù)的測試方法[J];中國礦業(yè);2016年10期

7 王洪丁;王觀石;胡世麗;羅嗣海;;離子型稀土礦體孔徑分布及其滲透性變化[J];科學(xué)技術(shù)與工程;2016年25期

8 黃紫彬;蔡昶;袁憲強;王強;;淺析原地浸礦開采的離子型稀土礦山安全問題[J];稀土;2013年04期

9 王世芳;吳濤;鄧永菊;戴偉;;隨機分布樹狀分叉網(wǎng)絡(luò)滲流特性的分形研究[J];華中師范大學(xué)學(xué)報(自然科學(xué)版);2012年04期

10 鄒國良;;離子型稀土礦不同采選工藝比較:基于成本的視角[J];有色金屬科學(xué)與工程;2012年04期

相關(guān)碩士學(xué)位論文 前1條

1 王立平;基坑水平井降水試驗及數(shù)值模擬研究[D];河南理工大學(xué);2009年

，

本文編號：1689629