不同孔隙比下風化殼淋積型稀土礦強度特性

尹升華; 齊炎; 謝芳芳; 陳勛; 王雷鳴

doi:10.13374/j.issn2095-9389.2018.02.005

不同孔隙比下風化殼淋積型稀土礦強度特性

doi: 10.13374/j.issn2095-9389.2018.02.005

尹升華^1,2,
齊炎^1,2, ,,
謝芳芳^3,4,
陳勛²,
王雷鳴²

1) 北京科技大學金屬礦山高效開采與安全教育部重點實驗室, 北京 100083
2) 北京科技大學土木與資源工程學院, 北京 100083
3) 江西離子型稀土工程技術研究有限公司, 贛州 341000
4) 國家離子型稀土資源高效開發利用工程技術研究中心, 贛州 341000

基金項目:

國家自然科學基金重點資助項目（51734001）；國家優秀青年科學基金資助項目（51722401）；國家重點研發計劃資助項目（2016YFC0600704）

詳細信息

中圖分類號: TD865
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出版歷程
- 收稿日期: 2017-04-27

Strength characteristics of weathered crust elution-deposited rare earthores with different porosity ratios

1) Key Laboratory of Ministry of Education for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China
2) School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
3) Jiangxi Ionic Rare Earth Engineering Research Co., Ltd., Ganzhou 341000, China
4) National Engineering Research Center for Ionic Rare Earth, Ganzhou 341000, China

摘要

摘要: 風化殼淋積型稀土開采過程中，孔隙比為影響浸礦效果和礦體穩定性的關鍵因素.為探索不同孔隙比下風化殼淋積型稀土礦強度特性變化，選取6組重配比的稀土礦樣，對不同孔隙比礦樣進行了直接剪切實驗，探討孔隙演化對礦體抗剪強度的作用規律，揭示孔隙比對黏聚力和內摩擦角的影響機制.研究表明：不同孔隙比非飽和稀土礦對應著不同的剪切強度，基于試驗數據發現剪應力與剪位移呈"類拋物線"變化，并建立了孔隙比與抗剪強度指標的關系模型.機制分析認為，隨著孔隙比的增大，結合水膜效應逐漸弱化，粒間接觸點數目也隨之減少，使礦體抗剪強度減小.
- 風化殼淋積型稀土 /
- 孔隙比 /
- 影響機制 /
- 抗剪強度指標
Abstract: The porosity ration of weathered crust elution-deposited rare earth ores is the main factor that affects the leaching results and the stability of the ore body. To determine the strength characteristics of weathered crust elution-deposited rare earth ores under different porosity ratios, six groups of rare earth minerals were reconstituted, and direct shear tests were performed for different samples. The effect of pore evolution on the shear strength of the orebody was studied, and the mechanism of the influence of porosity ratio on cohesion and internal friction angle was revealed. The results show that the unsaturated rare earth ores with different porosity ratios correspond to different shear strengths. The relation between shear stress and shear displacement was summarized as parabolic type based on the experimental data, and the relation between the porosity ratio and the shear strength index was established. The mechanism analysis shows that with an increase in the porosity ratio, the effect of the bonded water film effect gradually weakens, the number of the contact points reduces, and the shear strength of the minerals reduces.
- weathered crust elution-deposited rare earth /
- porosity ratio /
- influence mechanism /
- shear strength index

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參考文獻(5)

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