渗流作用下稀土矿孔隙结构与强度弱化关系研究  

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

作　　者：卓毓龙 王晓军[1,2] 曹世荣 邓书强 李永欣 韩建文[1] 

机构地区：[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

出　　处：《黄金科学技术》2017年第5期101-106,共6页Gold Science and Technology

基　　金：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

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。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.

关 键 词：渗流 黏聚力 内摩擦角 核磁共振 孔隙结构 强度 

分 类 号：TD865[矿业工程—金属矿开采]