Effects of water content distribution on hydraulic conductivity of prehydrated GCLS against calcium chloride solutions

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概要

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• 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 ben-tonite 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 x 10-8cm/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 A: = 2.9x 10-9cm/s to k= 1.5 x 10-6 cm/s. The homogeneity of the water content distribution has been consi-dered an important factor to obtain a required barrier performance under prehydration conditions, which are naturally generated in actual sites.

• 社団法人地盤工学会の論文

著者

• MARUYAMA Satoshi

  Department of Analytical Chemistry, Hoshi University

• Ogawa Atsushi

  Department of Pediatrics, School of Medicine, Fukuoka University

• KATSUMI TAKESHI

  Graduate School of Global Environmental Studies, Kyoto University

• Katsumi Takeshi

  Graduate School Of Global Environmental Studies Kyoto University

• ISHIMORI HIROYUKI

  Department of Civil Engineering, Ritsumeikan University

• FUKAGAWA RYOICHI

  Department of Civil Engineering, Ritsumeikan University

• Maruyama Satoshi

  Department Of Analytical Chemistry Hoshi University

• Ogawa Atsushi

  Department Of Biological Production Akita Prefectural University

• Fukagawa Ryoichi

  Department Of Civil Engineering Ritsumeikan University

• Fukagawa Ryoichi

  Department Of Civil And Ocean Engineering Faculty Of Engineering Ehime University

• Ishimori Hiroyuki

  Department Of Civil Engineering Ritsumeikan University

• Maruyama Satoshi

  Department Of Civil Engineering Ritsumeikan University

• Ogawa Atsushi

  Department Of Civil Engineering Ritsumeikan University

• Ogawa Atsushi

  Department Of Applied Physics Faculty Of Engineering Fukui University

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