8Goodman RE, Shi GH. Block theory and its application to rock engineering[M]. London: Prentice-Hall, 1985:30-169.
9Mauldon M, Goodman RE. Vector analysis of keyblock rotation[J]. Geotech Geoenviron Eng (ASCE), 1996(12) :113-122.
10Ge Xiurun,Feng Shuren. Model of regularly Jointed rockmass with consideration of the influence of couple stresses[J]. computer Methods and Advances In Geomechanics, 1991(6):138-152.
7Wang Jinan, Shang X C, Ma H T. lnvestigalion of cata- strophic ground collapse in Xingtai gypsum mines in China[ J]. Intenational Journal of Rock Mechanics & Mining Sciences, 2000,45(8): 1480-1499.