*Yuko Asano¹, Taro Uchida², Takashi Gomi³, Shigeru Mizugaki⁴, Marino Hiraoka⁵, Masanori Katsuyama⁶, Satoshi Niwa⁷, Yoshiyuki Yokoo⁸ (1.The University of Tokyo, 2.Tsukuba University, 3.Tokyo University of Agriculture and Technology, 4.Civil Engineering Research Institute for cold region, Public Works Research Institute, 5.Public Works Research Institute , 6.Kyoto Prefectural University, 7.Japan Conservation Engineers & Co., Ltd., 8.Fukushima University)

*Taro Uchida¹, Yuko Asano², Shigeru Mizugaki³, Yoshiyuki Yokoo⁴, Marino Hiraoka⁵, Takashi Gomi⁶, Satoshi Niwa⁷, Masanori Katsuyama⁸ (1.University of Tsukuba, 2.University of Tokyo, 3.Civil Engineering Research Institute for cold region, Public Works Research Institute, 4.Fukushima University, 5.Public Works Research Institute, 6.Tokyo University of Agriculture and Technology , 7.Japan Conservation Engineers & Co., Ltd. , 8.Kyoto Prefectural University)