The 2D non-linear effective stress FEM and test curve method for calculation of dynamic pore water pressure which was suggested by the second author are applied to analyze the dynamic response of an earth-rockfill dam on thick loess alluvial deposit

with emphasis on the distribution characters of absolute acceleration

dynamic displacement

dynamic stress and dynamic pore water pressure.The calculation results show that the dynamic response of the dam is not strong because of the soft deep loess alluvial deposit

but the loess alluvial deposit will be liquefied under the earthquake with intansity of 7 degree on the present design condition.Therefore

the resistance method of liquefaction should be adopted for the loess foundation.