*Zeping Tong⁴, Kentaro Yamamoto¹, Mizuki Hira², Katsuhisa Nagakawa³, Yukiyoshi Teramoto² (1. Nishinippon Institute of Technology, 2. Kagoshima University, 3. Kiso-Jiban Consultants Company, 4. Graduate school, Nishinippon Institute of Technology)

*Shinichi Ito¹, Kazunari Sako¹, Ryosuke Nakajima², Daiki Ogawa² (1. Kagoshima University, 2. Kagoshima University, Ocean Civil Engineering)

*Tatsuya Shibasaki¹, Sumio Matsuura², Takashi Okamoto³, Hikaru Osawa⁴ (1. Japan Conservation Engineers & Co., Ltd, 2. DPRI, Kyoto University, 3. Forestry and Forest Products Research Institute, 4. Tsukuba University)

*shangning tao¹, Taro Uchimura², Makoto Fukuhara¹, Junfeng Tang¹ (1. Saitama University,Department of Civil and Environmental Engineering, 2. Saitama University)

*Daisuke Kuriyama¹, Junichi Komatsu¹, Naoyuki Sato¹, Yuki Fukasawa¹, Masaki Waga¹, Noboru Fujii¹ (1. Okuyama Boring Co., Ltd.)

*Masaki Waga¹, Noboru Fujii¹, Daisuke Kuriyama¹, Yuki Fukasawa¹, Naoyuki sato¹, Junichi Komatsu¹ (1. Okuyama Boring Co.,Ltd.)

*Yuki Fukasawa¹, Junichi Komatsu¹, Daisuke Kuriyama¹, Masaki Waga¹, Naoyuki Sato¹, Noboru Fujii¹ (1. Okuyama Boring Co., Ltd)