Abstract:Based on the research trends of soil rheology and the stringent demand of practical engineering,the characteristics of creep-consolidation in soft soil,computational model,homologous numerical method and its application in engineering are systematically studied. The coupling of stress-strain model for soil and rheology model as well as consolidation model is researched. The practical model of nonlinear elasto-viscous consolidation is established. The study results show that the total displacement of soft soil,at given time,can be divided in instantaneous part and creep part. The instantaneous strain also presents obvious nonlinear property,and the time-dependent behavior of soil deformation is depended on its consolidation and viscosity. When stress level is lower,the displacement results mostly from consolidation. Otherwise the displacement primarily originates from shear creep. The creep deformation of soil is related to pore-pressure dissipation. Under uniform conditions,the worse the permeability is,the larger the creep deformation is. For soft soil strata,the secondary consolidation occurs during the primary consolidation,and the influence of creep on stress and strain is decided by drainage condition of soft foundation. The stress level will rise with time when drainage condition is bad. The possible destroy may be missed,if the characteristics of creep are not be taken into account of calculation. So,for the security of an engineering,the creep considered not only corrects the calculation results,but also is an afresh evaluation. Through the calculation of a representative example,the rationality of creep-consolidation model and the validity of conclusions have been tested and verified.