Based on the investigation and analysis of existing documents, combined with the research results and practice of high-speed railway subgrade engineering at home and abroad, the structural forms and design methods of high-speed railway subgrade bed in China, Japan, France, Germany and the United States are summarized. Layered reinforced structure is widely used in high-speed railway subgrade bed in foreign countries. The surface layer of subgrade bed adopts uniform double-layer or multi-layer structure, while the single structure is adopted in China. Foreign countries use different test parameters to evaluate the compaction states of filling materials according to their own understanding and habits, while China adopts compaction coefficient, foundation coefficient and dynamic deformation modulus to evaluate. In the design of high-speed railway subgrade bed structure in foreign countries, the top deformation control method, the bottom deformation modulus control method and the filling strength control method are mainly adopted. In China, the dynamic deformation control method of subgrade surface and the dynamic strain control method of subgrade bottom are adopted. However, the cumulative deformation effect of subgrade caused by train cyclic vibration load is not considered in current design methods. Based on the research status of the prediction methods for subgrade soil cumulative deformation at home and abroad, a new subgrade structure design method based on the whole process dynamic analysis to meet the functional requirements of subgrade is established, which will become the development trend of high-speed railway subgrade structure design. © 2021, Editorial Department of China Railway Science. All right reserved.
