Based on the stress-control triaxial apparatus

the CU triaxial creep tests of subgrade soft clay under different confining pressures were carried out by using multi-grade loading mode. The full-process creep curves under different confining pressures were obtained. Furthermore

the creep curves of multi-step constant load，the equal-time stress-strain curves were gained by using “Chen method”. Taking the confining pressure 100 kPa for example

a power&hyperbolic creep equation was proposed. In the equation

the power and hyperbolic equation are to model stress-strain and strain-time relationship respectively. Compared with Singh-Mitchell’s model and Mesri’ model

the creep equation suggested is thought to be more suitable to reflect the creep characteristics.