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*Jun Mitsuhashi
Horonobe Research Institute for the Subsurface Environment
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Masaru Akiyama
Horonobe Research Institute for the Subsurface Environment
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Hiroshi Wakahama
Horonobe Research Institute for the Subsurface Environment
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Michiko Shigehiro
Horonobe Construction Cooperative Association
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Yoji Ishijima
Graduate school of Engineering, Hokkaido University