Calculation of Permafrost Soil Thaw Settlement under Dynamic Load

Purpose: To develop a methodology for calculating the thaw settlement of permafrost soils of the railway subgrade under dynamic loads. To conduct a comparative analysis of the calculation results of soil settlement under dynamic loads and traditional calculations based on a static approach. Method: The initial parameters for performing settlement calculations were determined through experimental means, by conducting laboratory soil studies in a three-axis compression unit. The numerical finite element method (FEM), implemented in the specialized COMSOL Multiphysics software package, was utilized to simulate the settlement process. This complex enabled consideration of the particularities of the interaction between complex geological conditions and dynamic loads induced by railway transport movement. Results: The calculation demonstrated that the degree of railway subgrade settlement under dynamic load significantly exceeds that obtained using the traditional static calculation method. This finding emphasizes the necessity of incorporating dynamic parameters into the assessment of railway embankment stability on permafrost soils. Practical significance: It is imperative to consider dynamic loads when assessing the reliability and durability of structures in permafrost regions, as this can significantly affect the overall integrity and longevity of such structures. The implementation of the proposed technique will facilitate the accurate prediction of potential deformation and settlement of the soil foundations, thereby contributing to the prevention of premature degradation and emergency situations. Consequently, the findings of this research will be of significant practical value in enhancing the safety and efficiency of railway construction and operation in permafrost zones.