8MATSUI T, SAN K C. Finite element slope stability analysis by shear strength reduetion technique[J]. Soils and Foundations, 1992, 32(1): 59 - 70.
9DUNCAN J M. State of the art: limit equilibrium and finite element analysis of slopes[J]. Journal of Geoteehnieal Engineering, ASCE, 1996, 122(7): 577-596.
10ZIENKIEWICZ O C, HUMPESON C, LEWIS R W. Associated and nonassociated viscoplasticity in soil mechanics[J]. Geotechnique, 1975, 25(4): 671-689.