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*Youichi Azuta
Civil Engineering Research Institute for Cold Region,PWRI
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Masaru Matuzawa
Civil Engineering Research Institute for Cold Region,PWRI
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Yasuhiko Ito
Civil Engineering Research Institute for Cold Region,PWRI
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Hiroyuki Yokoyama
Civil Engineering Research Institute for Cold Region,PWRI
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Takeshi Yamada
Hokkaido Regional Development Bureau FUKAGAWA ROAD OFFICE