摘要
为掌握长期高温作用下铀尾矿库滩面非饱和覆土层控氡性能的变化特征,以铀尾矿库为对象,自制模拟滩面覆土层氡析出试验装置,选用黄土和我国南方铀尾矿库1. 5 m深处的尾矿砂为样品,试验研究长期高温条件下氡析出率与覆土层含水率、表面裂隙发育程度的关系。结果表明:氡析出率变化分为线性增长、线性下降、台阶式增长以及趋于稳定4个阶段;氡析出率随覆土层裂隙率的增大而增大,达到缩限时裂隙不再发育,氡析出率变化趋于平稳状态;覆土层裂隙的分形维数越大,土体龟裂程度越明显,氡析出率越大。
In order to study variation characteristics of radon control performance of unsaturated covering soil on uranium tailings beach under long time high temperature,with uranium tailings pond as study subject,simulation experiments were carried out by using a self-made experimental device of radon exhalation from covering soil on the beach. Then,relationships between water content,degree of surface fissure development and radon exhalation rate of covering soil were studied with samples of tailing sand at a depth of 1. 5 m from a uranium tailings pond in south China. The results show that the change of radon exhalation rate is divided into four stages,linear growth,linear decline, " step" growth and tending to stability. It increases with the increase of fracture rate of covering soil,and tend to be steady when shrinkage limit is reached and crack no longer develops. Moreover,the greater fractal dimension of cracks is,the more obvious soil cracking is,and the greater radon exhalation rate will be.
作者
刘艳
刘永
徐正华
洪昌寿
章求才
袁劲帆
LIU Yan;LIU Yong;XU Zhenghua;HONG Changshou;ZHANG Qiucai;YUAN Jinfan(School of Resource,Environment and Safety Engineering,University of South China,Hengyang Hunan 421001,China;Hunan Province Engineering Technology Research Centre of Uranium Tailings Treatment Technology,Hengyang Hunan 421001,China;Hunan Province Engineering Research Centre of Radioactive Control Technology in Uranium Mining and Metallurgy,Hengyang Hunan 421001,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2020年第3期171-177,共7页
China Safety Science Journal
基金
国家自然科学基金面上项目资助(11875164)
湖南省教育厅科研项目重点项目(18A232)
湖南省研究生科研创新项目(CX20190711)
湖南省社会发展领域重点研发项目(2019SK2011)。
关键词
铀尾矿库覆土层
氡析出率
含水率
裂隙率
分形维数
covering soil of uranium tailings pond
radon exhalation rate
water content
fracture rate
fractal dimension
