摘要
采用堆浸工艺开采稀土的离子型废弃稀土矿山植被生长稀疏,水土流失等地质灾害现象较为严重,为了改良稀土矿山土体性质,提高土体的强度,以定南县大塘尾废弃稀土矿山为研究示范区,采用膨润土、碳酸氢钠、水性聚氨酯、水泥和水按照一定比例制成土体加固材料,对离子型稀土矿山堆浸场地进行土体强化,采用直剪试验测试土体抗剪强度。试验结果表明:土体的抗剪强度显著提高,其中黏聚力提高了145.55%,内摩擦角增幅不明显;在较低的竖向应力作用下,加固土体的应力“硬化”潜力降低,剪切破坏类型向应力“软化”转变。研究成果为类似场地的生态修复以及水土保持工作提供了理论依据。
The abandoned ionic rare earth mines,which use heap leaching process to mine rare earth,have sparse vegetation growth and serious geological disasters such as soil erosion.In order to improve the soil properties of rare earth mines and improve the strength of soil,the abandoned rare earth mine in Datangwei,Dingnan County was taken as the research demonstration area.The soil reinforcement material was made of bentonite,sodium bicarbonate,waterborne polyurethane,cement and water in a certain proportion.The heap leaching site of ionic rare earth mine used the developed reinforcement material to strengthen the soil,and the direct shear tests were used to test the shear strength of the soil.The test results show that the shear strength of the soil is increased significantly,the cohesion is increased by 145.54%,and the variation of the internal friction angle is not obvious.Under the action of a relatively low vertical stress,the stress hardening potential of the reinforced soil is decreased,and the shear failure type changes to stress softening.The research results can provide a theoretical basis for ecological restoration and soil and water conservation in similar sites.
作者
陈飞
施康
罗特
CHEN Fei;SHI Kang;LUO Te(College of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341099,China;Jiangxi Key Laboratory of Mining Engineering,Ganzhou,Jiangxi 341099,China)
出处
《矿业研究与开发》
CAS
北大核心
2022年第11期114-118,共5页
Mining Research and Development
基金
国家重点研发计划项目(2019YFC1805101)
国家自然科学基金地区科学基金项目(42067042).
关键词
离子型稀土矿
堆浸场地
加固材料
抗剪强度
Ionic rare earth ore
Heap leaching
Reinforcement material
Shear strength
