5Arild Palmstrom, Characterizing rock mass by the RMI for use in practical rock engineering[J ]. Tunneling and Underground Technology, 1996, 11(2): 175-188.
6KAWAMOTO T, ICHIKACWA Y, KYOYA T. Deformation and fracturing behaviour of discontinous rock mass and damage mechanics theory[J]. Int. J. Num. Analy. geo, 1988, 12(4): 321-327.