Abstract: Since the Niigata Earthquake in Japan and Alaska Earthquake in the United States in 1964, Xingtai Earthquake in 1966 and Wenchuan Earthquake in 2008 in China, soil liquefaction has been paid much attention than ever before. In China, in addition to the detailed site seismic investigation and surveying, research work has been conducted on the test equipment such as dynamic triaxial apparatus, laboratory research on the seismic properties of sand, research on liquefaction evaluation method of sandy soils. Research results indicate that, the deformation and the stability of sandy soils under the action of seismic force are closely related to their physical and mechanical properties, the structural compositions. The seismic damage to the underground structures decreases with the increase of their embedment depths. For the railway subgrades, under cyclic impacts from the train and the other vibration sources, the soil properties have changed from their initial conditions and result in more complicated conditions for the seismic liquefaction evaluation. Therefore, the testing on the subgrade soils has a significant importance on the liquefaction evaluation.

Key words: Railway Subgrade, Sandy Soils, Seismic Liquefaction, Mitigation Measures, Considerations