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.

The uneven settlement of the upper soil mass and the soil mass on both sides of the rigid structure buried under the embankment will often produce excessive additional pressure on the top of the structure. The vertical earth pressure coefficient can reach 1.2, or even 2.0 when the fill is high, that is, there is stress concentration on the top of the structure, resulting in cracking and destruction of the underground structure.