Review of Research on Wind-sand Hazards in China Railway

China is the country with the longest mileage in the construction of sandstorms in the world. The railway system is often affected by wind sand flow, which seriously affects the operation safety of trains. Firstly, this article introduces the formation mechanism, movement state, monitoring method and structural characteristics of the wind-sand flow. Then the sand hazard formation mechanism of railway embankments, cuts, bridges and culverts is explained based on aerodynamic performance. Moreover, the sand prevention measures are classified, and the advantages and disadvantages of various measures are discussed. Finally, two kinds of sand prevention and control systems are proposed in combination with the topography and regional wind-sand flow characteristics, and the problems that need to be solved urgently in the prevention and treatment of railway sand and sand disasters in the future are prospected.