The mechanism of soil arching effect is the key technical problem for load transfer of pile supported embankment. However

the soil arching in pile supported embankment under high-speed railway load is not well investigated. Based on the code for design of high-speed railway

a three-dimensional finite element analysis model of pile supported reinforced embankment under high-speed railway load is established

and its correctness is verified by the existing research results. According to the numerical model

the dynamic response of subgrade under the high-speed railway load is analyzed

including the variation of vertical displacement with time at different depths of roadbed and embankment load

as well as the distribution of velocity and acceleration along the depth. The results show that the vertical displacement of the roadbed and the embankment surface changes with time in an inverted M shape periodically

while the embankment bottom changes in a V shape periodically. It is also found that the velocity and acceleration decrease by 80% along the depth of subgrade. Then

the influence of different factors including pile spacing

embankment height and the properties of the embankment fill on the stresses and settlements are comprehensively analyzed. Hence

the soil arching effect in piled embankment under high-speed railway loading can be investigated. It shows that the soil arching effect remains valid but weakened under the dynamic loading

which weakens the maximum under the peak load

while restores under the valley load. Also it is found that the influences of pile spacing and embankment height are obvious on soil arching effect under dynamic loading

while the effects of friction angle and dilatancy angle of embankment fill are relatively small.