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Keywords: Hibino
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Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2005, May 18–20, 2005
Paper Number: ISRM-EUROCK-2005-030
... deformation in the cavern wall (Site 1KSY 1968, Table 1) (Hayashi & Hibino 1969) (I) A number of pre-stressed (PS) bolts (Φ27mm, strength of 608 kN, length of 15 m) began to be torn off at their top heads and the broken heads flew like a bullet when the excavation proceeded down to an elevation of 42 m...

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