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*Jun Shitamichi
Civil Engineering Research Institute for Cold Region,Douhoku Branch Office
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Namio Takadama
Civil Engineering Research Institute for Cold Region,Douhoku Branch Office
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Masaru Matsuzawa
Civil Engineering Research Institute for Cold Region
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Yasuhiko Ito
Civil Engineering Research Institute for Cold Region
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Tetsuro Matsushima
Muroran road office,Muroran Development and Construction Department