5Goodman R E,Shi G. Block theory and its application to rock engineering[R]. New Jersey: Pretence-Hall, 1985.
6Yarahmaidi Bafghi A R, Verclel T. The key-group method[J]. International Journal for Numerical and Analytical Methods in Geomechanies, 2003 (27) : 495 -511.
7Warburton P M. Vector stability analysis of an arbitrary polyhedral rock block with any number of free faces[J]. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstract, 1981,18 : 415 -427.
8Lin D, Fairhurst C. Static analysis of the stability of three-dimensional blocky systems around excavations in rock[J]. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstract, 1988,25(3): 139-148.