CONSOLIDATION AND CREEP COUPLING MODEL FOR SOFT SOIL CONSIDERING TEMPERATURE EFFECT

Consolidation and creep of soft soil determine the long-term deformation and stability of soft soil ground and structures on it. With the rise and gradual development of thermal geotechnical engineering, studying the consolidation and creep characteristics of soft soil with thermal-mechanical coupling effect into account and establishing a mechanical model are of great significance for evaluating the long-term deformation and stability of soft soil sites in heat-related engineering. In this regard, combing the existing research results on thermal consolidation and creep of soft soils, some empirical formulas considering the temperature effect are presented. A series of tests about thermal consolidation creep for local soft soils are conducted, and the consolidation creep characteristics of typical soft soils and related parameter values are obtained. On this basis, combined with elasto-visco-plastic theory and thermal consolidation theory, a consolidation-creep coupled mechanical model considering temperature effect is derived and established. The calculation results of examples show that the model can reflect the deformation of elasticity, plasticity, viscosity and thermal expansion. It can describe the thermal excess pore water pressure, thermal rebound and thermal deformation of soil, and it can also analyze the temperature effect and time effect of long-term soil deformation. This research can provide a theoretical basis for the analysis of thermal geotechnical engineering problems in soft soil areas.