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Dinh Van TIEN
Institute of Transport Science and Technology, Hanoi, Vietnam
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Shinro ABE
Okuyama Boring Co., Ltd.
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Hiroyuki YOSHIMATSU
Kawasaki Geological Engineering Co., Ltd.
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Tatsuya SHIBASAKI
Japan Conservation Engineering & Co., Ltd.
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Toyohiko MIYAGI
Japan Conservation Engineering & Co., Ltd.
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Author's Organization:Tohoku Gakuin University, Sendai, Japan