Deformation of soft soils under constant stress ration consolidation with K_0

The deformation and long-term deformation of soft soils are concerned both in academic and engineering fields, and they lead to the excessive settlement and post-construction settlement of soft layers. Based on one-dimensional consolidation principle, the tests on the constant stress ratio consolidation with K0, which is more actual consolidation state of soft foundation, are carried out to study the primary and secondary consolidation characteristics. The undisturbed samples used are obtained from a dredger fill foundation in Shantou of Guangdong province. By comparing with the K0 confined compression tests, it is noted that the instantaneous compression is significant in the tests on the constant stress ratio consolidation with K0, which affect the primary and secondary deformations. There are higher compression index, lower compression modulus and lower secondary consolidation coefficient than those in K0 confined compression tests, and the duration of the primary consolidation is shorter.