Evaluation of environmental feasibility of steel pipe sheet pile cutoff wall at coastal landfill sites |
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Authors: | Shinya Inazumi Hiroyasu Ohtsu Yu Otake Makoto Kimura Masashi Kamon |
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Institution: | (1) Department of Urban Management, Graduate School of Engineering, Kyoto University C-cluster, Kyoto-daigaku-katsura, Nishikyo-ku, Kyoto 615 8540, Japan;(2) Graduate School of Management, Kyoto University, Kyoto, Japan;(3) Toyo Business Engineering Corporation, Toyo, Japan;(4) Innovative Collaboration Center, Kyoto University, Kyoto, Japan;(5) Graduate School of Global Environmental Studies, Kyoto University, Kyoto, Japan |
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Abstract: | An evaluation method that can express the local leakage of leachate from joint sections in steel pipe sheet pile (SPSP) cutoff
walls is discussed in this study. In particular, the evaluation of environmental feasibility (containment of leachates containing
toxic substances) considering a three-dimensional arrangement and hydraulic conductivity distribution of the joint sections
in the SPSP cutoff wall is compared with an evaluation that uses the equivalent hydraulic conductivity. This equivalent hydraulic
conductivity assumes that the joint section and the steel pipe are integrated; therefore, the hydraulic conductivity is substituted
with a uniform permeable layer. However, in an evaluation that employs the equivalent hydraulic conductivity, it is difficult
to consider the local leakage of leachate containing toxic substances from the joint sections in the SPSP cutoff wall. It
was established that evaluations of the environmental feasibility of SPSP cutoff walls with joint sections must take into
account the local leakage of leachates containing toxic substances from the joint sections. Also, it was clarified that technologies
that lower the hydraulic conductivities of joint sections in SPSP cutoff walls and also facilitate the use of sparser joint
arrangements contribute significantly to increasing the environmental feasibility of SPSP cutoff walls at landfill sites. |
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Keywords: | Coastal landfill site Environmental feasibility Local leakage of leachate Steel pipe sheet pile Vertical cutoff barrier |
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