花岗岩单一裂隙中Na、Cu、U的迁移试验

Na,Cu,U Transport in Granite Rock

花岗岩作为高放废物处置库的地质屏障,其所含裂隙形成大量＂通道＂为废物在地下水运移提供条件,研究其迁移规律可为管控高放废物等问题提供理论数据。试验使用自制花岗岩裂隙溶质迁移试验设备,进行了以Na、Cu、U为示踪剂的迁移试验,得出以下结论：（1）裂隙中各示踪剂随迁移距离增加,相对浓度峰值逐渐减小,峰面积逐渐增大,时间-相对浓度曲线＂缩首＂现象减弱且＂拖尾＂现象明显;（2）对比三种示踪剂迁移曲线发现,曲线＂缩首＂现象程度U〉Na〉Cu,曲线＂拖尾＂现象程度Cu〉Na〉U;推测出花岗岩对三种示踪剂阻滞作用Cu〉Na〉U;（3）使用配线法分别求出Na、Cu、U的纵向弥散度分别为：0.084 2～0.107 7m、0.092 1～0.116 2m、0.095 8～0.133 7m;横向弥散度为：0.000 77m、0.000 66m、0.000 30m。

High-level radioactive waste would transport into groundwater by a large number of＂channels＂in the granite fracture.The study of the migration law can provide theoretical data for control of high-level waste.The following experiments were designed and carried out：Na,Cu and U transport experiment in granite rock.The experimental results show that：（1）With increasing distance,the concentration of peak value is decreasing and tailing phenomena is more obvious;（2）The maximum degree of tailing phenomena is curve of Cu and minimum degree of tailing phenomena is curve of U;（3）Longitudinal disperse coefficient for Na,Cu and U in granite rock range from 0.084 2 mto 0.107 7 m,from0.092 1mto 0.116 2mand from 0.095 8mto 0.133 7mrespectively.Meanwhile,transverse dispersion coefficient for Na,Cu and U respectively is 0.000 77 m,0.000 66 m,0.000 30 m.