Abstract: Based on the one-dimensional compression creeping and step-loading test on the soft soil subjected to the vacuum preloading treatment in Tianjin Binhai New Area， the modified Singh-Mitchell empirical creep model was used to improve the Terzaghi consolidation theory， and a new one-dimensional consolidation equation was obtained. The new equation used the soft soil mechanics indexes， obtained from the one-dimensional compression and creep tests， as the calculation parameters， and considered the creep deformation generated after primary consolidation. The results obtained from the new equation on different depths of specimens with different stress levels are very close to the test results， which indicates that the new equation can reflect the stress-strain-time relationship of soft soil and is applicable for the soft soil foundation in Tianjin Binhai New Area.

Key words: soft soil foundation, creep, Terzaghi consolidation theory, empirical creep model, Singh-Mitchell model