Abstract: Under the background of the development needs of energy geotechnical engineering, the research on the temperature effect of soil engineering characteristic has received extensive attention from scholars. Aiming at the shortcomings of the existing theoretical research on cyclic variable temperature thermal consolidation, this paper gives a relationship between the change of the soil preconsolidation pressure and the number of temperature cycles under the condition of cyclic temperature change to calculate the consolidation and compression of soft soil after repeated temperature changes. On this basis, the modified Terzaghi consolidation formula considering the cyclic temperature change is derived to predict the change of pore pressure and consolidation settlement during the whole cycle of temperature change. Finally, the reliability of the calculation model is verified by comparing with the unit test results. The research indicates that under the coupling action of cyclic temperature change and instantaneous load, the settlement deformation and pore pressure of the soil will change with the number of temperature cycles, and the degree of influence is related to the number of cycles; the proposed thermal consolidation model provides certain theoretical support for the analysis of geotechnical engineering problems involving cyclic temperature variations.

Key words: soft soil, cyclic temperature variation, consolidation, settlement, pore pressure