Dynamic response analysis and comprehensive evaluation of cement-improved aeolian sand roadbed

Abstract Long-term stability of high-speed railway roadbeds is a complex multi-criteria decision-making problem. The stability of cement-improved sandy roadbeds is investigated and evaluated in order to efficiently identify and control risk, assure train safety, and optimize resource allocation. This study relies on bibliometric analysis to filter out roadbed assessment indexes and create an evaluation index system. The Analytic Hierarchy Process-Technique for Order Preference by Similarity to Ideal Solution evaluation model is established, and finite element software is used to simulate the actual project, allowing for dynamic stability analysis of the roadbed and lateral comparison of each scheme. The roadbed’s dynamic stability analysis and lateral comparison are completed, as well as the analysis and optimization of the roadbed parameters. The results reveal that a 3:7 pulverized soil ratio and 6% cement mixing improve roadbed stability by 5%. The effect of cement was larger than that of silt. The proposed model’s evaluation results were similar to the field test, demonstrating its dependability, and the research findings can be used to construct a cement-improved aeolian sand high-speed train foundation.