10:45 〜 12:15
[HRE12-P07] Freezing simulation of frozen soil and the application prospect of the freeze-thaw method
キーワード：multifield modeling, frozen soil, soil improvement, vacuum preloading
The freezing process of frozen soil is a complex, dynamic, and interactive hydro–thermal–salt–mechanical (HTSM) coupled physical phenomenon. In this presentation, the interaction mechanism between different physical fields of water, heat, and salt in the soil during the process of freezing and evaporation of saline soil was deeply analyzed, and the salinization mechanism and frost heave deformation mechanism of saline soil were studied, as well as the modification of special soil by artificial freeze-thaw method and technology. A multi-field coupling equation of water, heat, and salt under freezing conditions was established to analyze soil deformation characteristics. During the freeze-thaw test, water, heat, deformation, and pore characteristics were used for monitoring and analysis. Besides, experimental study on the improvement of special soil by artificial freeze-thaw method was conducted, and this method was also applied together with vacuum preloading. The results show that the deformation characteristics of soil are closely related to the hydro-thermal coupling migration under freeze-thaw action. The transformation of water during the migration process leads to a change in the internal pore structure of the soil, which is the main cause of mechanical deformation. The coupled model can effectively describe the process of water and salt migration considering evaporation conditions. The migration of salt is more complex than that of water, and the migration characteristics are closely related to water migration and other factors. In addition, the artificial freeze-thaw method has a good application prospect in improving the treatment of mud dehydration.