2Roscoe K N, Schofield A N, Wroth W P. On the yielding of soils [J]. G6otechnique, 1958, 8( 1 ) : 22 -53.
3Roscoe K H, Burland J B. On the generalized stress-strain behav- ior of "wet" clay. Engineering Plasticity [ J ]. London: Cambridge University Press, 1968 : 535 -609.
4柳艳华. 天然软黏土屈服特性及主应力轴旋转效应研究[D]. 上海: 同济大学, 2010.
5Dafalias Y F, Herrmann L R. Bounding surface plasticity II: ap- plication to isotropic cohesive soils[ J3. Journal of Engineering Me- chanics, 1986, 112 (12) : 1263 - 1291.