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QUANTITATIVE EXPERIMENT OF UNSATURATED WATER VADOSE THROUGH TWO-LAYER POROUS MEDIA
Author(s): 
Pages: 14-18
Year: Issue:  1
Journal: RADIATION PROTECTION

Keyword:  双层孔隙介质非饱和水绕流渗流定量实验;
Abstract: 非饱和水通过双层孔隙介质的渗流对于放射性废物近地表处置库的顶盖设计具有重要意义.本文主要介绍非饱和水通过以黄土(细颗粒)和石英砂(粗颗粒)组成的双层孔隙介质渗流定量实验的装置、方法及其结果.从实验结果可见:黄土中的非饱和水在下渗过程中遇到石英砂层时,即使石英砂层很薄,且粒度很小,下渗水也发生绕流现象;相对绕流量的大小随水的喷淋强度的增大而减小,随石英砂层厚度的增加而增加.另外,实验发现,相当部分的绕流水是紧贴石英砂层的下表面运动的.由实验结果推断,在石英砂粒径0.2~0.45 mm、埋深20 cm情况下,不起绕流作用的石英砂层厚度≤1 mm;对于≥2 mm厚的石英砂层,相对绕流量达100%的喷淋强度需低于5 mm/d.
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