1. 1) K. Fukui: Journal of MMIJ, 116 (2000) , 304-308.
2. 2) P. P. Nelson, T. D. O’Rourke and F. H. Kulhawy: Design and performance of underground excavations, ISRM/BGS, (1984) , pp.239-246.
3. 3) P. J. Tarkoy: Proc. 15th Symposium On Rock mechanics, (1973) , pp.415-447.
4. 4) Nihon-Tonnneru-Gijyutsu-Kyoukai: TBM-Hando-Bukku, (Nihon-Tonnneru-Gijyutsu-Kyoukai, Tokyo, 2000) , p.14, pp.26-30, pp. 214-225.
5. 5) P. P. Nelson, A. R. Ingraffea and T. D. O’Rourke: Int. J. Rock Mech. Min. Sci. Geomech. Abtsr., 22 (1985) , 189-192.