浸矿开采对离子型稀土基岩力学特性的影响研究  

Experimental study of the influence of leaching mining on mechanical properties of ionic rare earth ore floor bedrock

作　　者：钟文[1,2] 朱文韬 曾鹏 黄震[1,3] 王晓军[1,3] 郭钟群[4] 胡凯建 ZHONG Wen;ZHU Wen-tao;ZENG Peng;HUANG Zhen;WANG Xiao-jun;GUO Zhong-qun;HU Kai-jian(School of Resources&Environment Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;Key Laboratory of Mining Engineering of Jiangxi Province,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China;School of Civil and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China;Deep Vein Group Mine Intelligent Mining Technology Innovation Center of Ganzhou,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China)

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]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [3]江西理工大学江西省矿业工程重点实验室,江西赣州341000 [4]江西理工大学土木与测绘工程学院,江西赣州341000 [5]江西理工大学赣州市深部脉群矿智能化开采技术创新中心,江西赣州341000

出　　处：《岩土力学》2022年第6期1481-1492,共12页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51764014,No.51874148,No.51904119,No.52004106,No.52104086);江西省自然科学基金(No.20192BAB206018);中国博士后科学基金(No.2017M622099);岩土力学与工程国家重点实验室开放基金(No.Z017024);江西省教育厅科技资助项目(No.GJJ160674);江西省博士后择优资助项目(No.2018KY03);江西省青年井冈学者计划(No.QNJG2019054);赣州市创新领军人才计划(No.[2020]60);江西省杰出青年人才资助计划项目(No.20192BCBL23010)。

摘　　要：为研究原地浸矿母液对离子型稀土矿收液底板的侵蚀影响,以离子型稀土矿基岩(半/弱风化花岗岩)为研究对象,开展了室内浸矿模拟试验。对比分析了不同浸矿时间岩样的应力-应变曲线、峰值应力、峰值应变和弹性模量,获取了不同浸矿历时岩样的孔隙度和细观形貌特征,并运用盒维法对岩样的非线性裂纹特征进行了定量化描述。结果表明:浸矿侵蚀作用对离子型稀土矿底板基岩力学性质的影响主要表现在前150d,破坏形式由贯穿破坏转变为贯穿破坏与片状剥落并存;浸矿母液侵蚀作用下,基岩力学特性呈现先大幅减小后大幅回升,其后在小范围波动现象,浸矿约60d对基岩力学特性的影响程度最大;浸矿母液侵蚀造成基岩内小孔隙增长,导致表面出现腐蚀及孔洞现象;浸矿时间不同将造成岩石不同的微观结构变化。In order to study the erosion effect of in-situ leaching mother liquor on the receiving floor of ionic rare earth ore,an indoor leaching simulation test was carried out with the bedrock of ionic rare earth ore(semi/weakly weathered granite)as the research object.The stress-strain curves,peak stress,peak strain and elastic modulus of rock samples for different leaching durations are compared and analysed,the porosity and micro morphology characteristics of rock samples for different leaching durations are obtained,and the nonlinear crack characteristics of rock samples are described quantitatively by box dimension method.The results show that the effect of leaching erosion on the mechanical properties of the bedrock of the floor of ionic rare earth ore is mainly manifested in the first 150 days,and the failure form changes from penetration failure to the coexistence of penetration failure and flaky spalling.Under the erosion of ore leaching mother liquor,the mechanical properties of bedrock first decrease greatly and then rise sharply,and then fluctuate in a small range.About 60 days of ore leaching has the greatest impact on the mechanical properties of bedrock.The erosion of ore leaching mother liquor causes the growth of small pores in the bedrock,resulting in corrosion and holes on the surface.Different leaching durations will cause different microstructure changes of rocks.

关 键 词：离子型稀土 浸矿侵蚀 基岩 力学特性 微观结构 

分 类 号：TD854[矿业工程—金属矿开采]