3Chen, S.H. , Egger, P. Three dimensional elasto - viscoplastic finite element analysis of reinforced rock masses and its application[J]. Int. J. for Num. and Anal. Meth. in Geomech, 1999,23 ( 1 ) :61 -78.
5Chen S. H. , He Z. G. , Egger P. Study of hollow friction bolts in rock by a three dimensional composite element method [ A ]. Proceedings of ISRM 2003 - Technology roadmap for rock mechanics[ C]. South Africa,2003.