EFFECTS OF WATER CONTENT DISTRIBUTION ON HYDRAULIC CONDUCTIVITY OF PREHYDRATED GCLS AGAINST CALCIUM CHLORIDE SOLUTIONS

SOILS AND FOUNDATIONS

RYOICHI FUKAGAWA¹  TAKESHI KATSUMI²  ATSUSHI OGAWA¹  SATOSHI MARUYAMA¹  HIROYUKI ISHIMORI¹ 

[1] Department of Civil Engineering, Ritsumeikan University;Graduate School of Global Environmental Studies, Kyoto University

关键词: chemical resistance;    geosynthetic clay liner;    hydraulic conductivity;    prehydration;    (IGC: D4);   

DOI  :  10.3208/sandf.48.407

学科分类：建筑学

来源: Japanese Geotechnical Society / Jiban Kogakkai

【 摘 要 】

References(45)Cited-By(1)When geosynthetic clay liners (GCLs) are applied as bottom liners at waste containment facilities, they are naturally prehydrated by absorbing moisture in the underlying base layers. In order to evaluate the effects of cations contained in waste leachates, this study investigated the effects of the water content distribution of the GCLs prehydrated with actual soils on their hydraulic conductivities against CaCl2 solutions. The “prehydration tests”, which were conducted prior to the hydraulic conductivity tests, showed that the water content distribution of the prehydrated GCLs depends on the properties of the GCLs and the base layers. In particular, drastic differences between GCLs with powdered bentonite and GCLs with granular bentonite were observed in the prehydration water content and its distribution. Prehydrated GCLs with powdered bentonite had a higher water content and a more homogenous distribution than those with granular bentonite. The hydraulic conductivity tests showed that most of the prehydrated GCLs exhibit a low hydraulic conductivity of k≈1.0×10-8 cm/s against CaCl2 solutions with 0.1-0.5 M. However, GCLs with granular bentonite may be difficult to homogeneously prehydrate and exhibit an unstable hydraulic conductivity, which varies from k=2.9×10-9 cm/s to k=1.5×10-6 cm/s. The homogeneity of the water content distribution has been considered an important factor to obtain a required barrier performance under prehydration conditions, which are naturally generated in actual sites.

【 授权许可】

Unknown