[5]
Engineering classification of rock masses for the design of tunnel support[J] . N. Barton,R. Lien,J. Lunde.Rock Mechanics Felsmechanik Mécanique des Roches . 1974 (4)
[5]
Engineering classification of rock masses for the design of tunnel support[J] . N. Barton,R. Lien,J. Lunde.Rock Mechanics Felsmechanik Mécanique des Roches . 1974 (4)