1. Abad, J., Caleda, B., Chacon, E., Gutierrez, V. and Hidlgo, E., 1984, Application of geomechanical classification to predict the convergence of coal mine galleries and to design their supports, 5th Int. Congr. Rock Mech., Melbourne, pp. 15–19
2. Engineering classification of rock masses for the design of tunnel support;Barton;Rock Mech.,1974
3. Barton, N., 1995, Permanent support for tunnels using NMT, Special Lecture, Proc. Symp. of KRMS (Korea Rock Mechanics Society) and KSEG (Korea Society of Engineering Geolgoy), pp. 1–26
4. Engineering rock mass classifications;Bieniawski,1989
5. Correlation of rock mass classification parameters obtained from borecore and in situ observations;Carmeron-Clarke;Eng. Geol.,1981