When constructing embankment on soft soil foundation, due to the large density of ordinary fillers, the additional stress of the foundation caused by their own weight is large, which often causes excessive uneven settlement and settlement of the subgrade. Due to the low density and super lightweight characteristics of EPS, after a certain depth of replacement, it can effectively reduce the dead weight of the embankment, reduce the additional stress of the foundation, reduce the settlement of the embankment on the soft soil foundation, and improve the stability of the foundation.

EPS, as an ultra light subgrade filler, is widely used abroad. The practice has proved that EPS has good thermal insulation, light self weight, strong self-supporting and other excellent properties, and has good treatment effect on solving problems such as subgrade frost damage, bridge head bump, subgrade instability, new and old subgrade splicing, etc.