工程科学学报，第40卷，第2期：159-166,2018年2月 Chinese Journal of Engineering,Vol.40,No.2:159-166,February 2018 DOI:10.13374/j.issn2095-9389.2018.02.005;http://journals.ustb.edu.cn 不同孔隙比下风化壳淋积型稀土矿强度特性 尹升华12)，齐炎12)四，谢芳芳34)，陈勋)，王雷鸣2) 1)北京科技大学金属矿山高效开采与安全教有部重点实验室，北京1000832)北京科技大学土木与资源工程学院，北京100083 3)江西离子型稀土工程技术研究有限公司，赣州3410004)国家离子型稀土资源高效开发利用工程技术研究中心，赣州341000 区通信作者，E-mail:oupwuqiyan@163.com 摘要风化壳淋积型稀土开采过程中，孔隙比为影响浸矿效果和矿体稳定性的关键因素.为探索不同孔隙比下风化壳淋积 型稀土矿强度特性变化，选取6组重配比的稀土矿样，对不同孔隙比矿样进行了直接剪切实验，探讨孔隙演化对矿体抗剪强度 的作用规律，揭示孔隙比对黏聚力和内摩擦角的影响机制.研究表明：不同孔隙比非饱和稀土矿对应着不同的剪切强度，基于 试验数据发现剪应力与剪位移呈“类抛物线”变化，并建立了孔隙比与抗剪强度指标的关系模型.机制分析认为，随着孔隙比 的增大，结合水膜效应逐渐弱化，粒间接触点数目也随之减少，使矿体抗剪强度减小 关键词风化壳淋积型稀土；孔隙比：影响机制：抗剪强度指标 分类号TD865 Strength characteristics of weathered crust elution-deposited rare earthores with differ- ent porosity ratios YIN Sheng-hua2),QI Yan,XIE Fang-fang4),CHEN Xun?),WANG Lei-ming?) 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 lonic Rare Earth Engineering Research Co.,Ltd.,Ganzhou 341000,China 4)National Engineering Research Center for lonic Rare Earth,Ganzhou 341000,China Corresponding author,E-mail:groupwuqiyan@163.com 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 dif- ferent 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 co- hesion and internal friction angle was revealed.The results show that the unsaturated rare earth ores with different porosity ratios corre- spond 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. KEY WORDS weathered crust elution-deposited rare earth;porosity ratio;influence mechanism;shear strength index 收稿日期：2017-04-27 基金项目：国家自然科学基金重点资助项目(51734001)：国家优秀青年科学基金资助项目(51722401)：国家重点研发计划资助项目 (2016YFC0600704)工程科学学报,第 40 卷,第 2 期:159鄄鄄166,2018 年 2 月 Chinese Journal of Engineering, Vol. 40, No. 2: 159鄄鄄166, February 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 02. 005; http: / / journals. ustb. edu. cn 不同孔隙比下风化壳淋积型稀土矿强度特性 尹升华1,2) , 齐 炎1,2) 苣 , 谢芳芳3,4) , 陈 勋2) , 王雷鸣2) 1) 北京科技大学金属矿山高效开采与安全教育部重点实验室, 北京 100083 2) 北京科技大学土木与资源工程学院, 北京 100083 3) 江西离子型稀土工程技术研究有限公司, 赣州 341000 4) 国家离子型稀土资源高效开发利用工程技术研究中心, 赣州 341000 苣 通信作者, E鄄mail: groupwuqiyan@ 163. com 摘 要 风化壳淋积型稀土开采过程中,孔隙比为影响浸矿效果和矿体稳定性的关键因素. 为探索不同孔隙比下风化壳淋积 型稀土矿强度特性变化,选取 6 组重配比的稀土矿样,对不同孔隙比矿样进行了直接剪切实验,探讨孔隙演化对矿体抗剪强度 的作用规律,揭示孔隙比对黏聚力和内摩擦角的影响机制. 研究表明:不同孔隙比非饱和稀土矿对应着不同的剪切强度,基于 试验数据发现剪应力与剪位移呈“类抛物线冶变化,并建立了孔隙比与抗剪强度指标的关系模型. 机制分析认为,随着孔隙比 的增大,结合水膜效应逐渐弱化,粒间接触点数目也随之减少,使矿体抗剪强度减小. 关键词 风化壳淋积型稀土; 孔隙比; 影响机制; 抗剪强度指标 分类号 TD865 收稿日期: 2017鄄鄄04鄄鄄27 基金项目: 国家自然科学基金重点资助项目(51734001 );国家优秀青年科学基金资助项目( 51722401 );国家重点研发计划资助项目 (2016YFC0600704) Strength characteristics of weathered crust elution鄄deposited rare earthores with differ鄄 ent porosity ratios YIN Sheng鄄hua 1,2) , QI Yan 1,2) 苣 , XIE Fang鄄fang 3,4) , CHEN Xun 2) , WANG Lei鄄ming 2) 1) Key Laboratory of Ministry of Education for High鄄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 苣 Corresponding author, E鄄mail: groupwuqiyan@ 163. com ABSTRACT The porosity ration of weathered crust elution鄄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鄄deposited rare earth ores under dif鄄 ferent 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 co鄄 hesion and internal friction angle was revealed. The results show that the unsaturated rare earth ores with different porosity ratios corre鄄 spond 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. KEY WORDS weathered crust elution鄄deposited rare earth; porosity ratio; influence mechanism; shear strength index