6ALLERSMA H G B, RAVENSWAAY L, VOS E. Investigation of road widening on soft soil using a small centrifuge [ R]. Transportation research record 1462, 1994 : 47 - 53.
7HUANG T K, CHEN W F, CHAMEAU J C. Application of cap-plasticity-model to embankment problems [ J]. Computers and Structures, 1992, 44 (6) :1349 - 1369.