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*Shigeyuki Kasamura
Civil Engineering Research Institute for Cold Region(CERI), PWRI
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Hiroki Matsushita
Civil Engineering Research Institute for Cold Region(CERI), PWRI
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Osamu Sakase
Hokkaido Regional Development Bureau(Prior affiliation: CERI,PWRI)
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Masaru Matsuzawa
Civil Engineering Research Institute for Cold Region(CERI), PWRI
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Hiroshi Nakamura
Civil Engineering Research Institute for Cold Region(CERI), PWRI