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黄金科学技术 ›› 2017, Vol. 25 ›› Issue (5): 101-106.doi: 10.11872/j.issn.1005-2518.2017.05.101

• 采选技术与矿山管理 • 上一篇    下一篇

渗流作用下稀土矿孔隙结构与强度弱化关系研究

卓毓龙1,王晓军1,2*,曹世荣 1,邓书强 1,李永欣1,韩建文 1   

  1. 1.江西理工大学资源与环境工程学院,江西  赣州   341000;
    2.江西理工大学江西省矿业工程重点实验室,江西  赣州   341000
  • 收稿日期:2017-01-06 修回日期:2017-06-22 出版日期:2017-10-30 发布日期:2018-02-12
  • 通讯作者: 王晓军(1979-),男,山西晋中人,博士,副教授,从事矿山工程岩体稳定性分析与控制方面的研究与教学工作。847524920@qq.com
  • 作者简介:卓毓龙(1992-),男,江西赣州人,博士研究生,从事离子型稀土高效开发与绿色提取研究工作。879408217@qq.com
  • 基金资助:

    国家自然科学基金项目“浸矿液饱和浸注过程离子型稀土矿体液化机制及滑移特性研究”(编号:51364011)、“堆浸应力路径与化学置换过程散体矿堆力学特性弱化机制研究”(编号:51564012)、江西省研究生创新专项“化学置换过程离子型稀土矿体力学性状演化规律研究”(编号:YC2015-S294)和“化学置换过程中散体矿堆强度特性及变形机制研究”(编号:YC2016-S320)联合资助

Study on Relationship Between Pore Structure and Strength Weakening of Rare Earth Ore Under Seepage

ZHUO Yulong1,WANG Xiaojun 1,2,CAO Shirong 1,DENG Shuqiang 1,LI Yongxin 1,HAN Jianwen 1   

  1. 1.School of Resources and Environment Engineering,Jiangxi University of Science and Technology,Ganzhou    341000,Jiangxi,China;
    2.Jiangxi Key Laboratory of Mining Engineering,Jiangxi University of Science and Technology,Ganzhou    341000,Jiangxi,China
  • Received:2017-01-06 Revised:2017-06-22 Online:2017-10-30 Published:2018-02-12

摘要:

为研究纯水入渗过程中重塑稀土试样微观孔隙结构和强度的变化规律,进行了室内模拟浸矿、核磁共振和三轴压缩试验。结果表明:随着纯水渗流浸矿时间的推移,试样内部微观结构的变化呈现中等孔径孔隙向大孔径孔隙变化的趋势;2个主要强度指标值即黏聚力和内摩擦角随纯水入渗时间推移呈现大幅减小的变化规律。综合分析结果表明,渗流作用使矿体内部孔隙结构发生改变从而诱发矿体强度逐步弱化;孔隙结构的变化是造成矿体强度弱化的主要诱因。

关键词: 渗流, 黏聚力, 内摩擦角, 核磁共振, 孔隙结构, 强度

Abstract:

To obtain the rule of micro-pore structure and strength of remolded  rare earth samples during the pure water infiltration process,the experiments of indoor simulated leaching,nuclear magnetic resonance and triaxial compression were carried out.The results showed that the microscopic pores in the sample change from medium pore size to large pore size,and the main strength indexes(cohesion and internal friction angle) decreased sharply with leaching time increased.Comprehensive analysis indicated that the seepage action changes the pore structure of orebody to induce the weakening the strength of orebody,and the change of pore structure is the main inducement of weakening  the strength of orebody.

Key words: seepage, cohesion, angle of internal friction, nuclear magnetic resonance (NMR), pore structure, strength

中图分类号: 

  • TU443

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