Abstract
On the earth pressure reduction of rigid culverts using expanded polystyrol, field test results were reported, while results without such material were also presented in various papers. Evaluation of these data clarified the elements determining the magnitude of vertical earth pressure on the culvert without expanded polystyrol, and, for cases with this compressive material, the relationship between placement conditions of the material and vertical earth pressure reduction effect. The previous papers mainly addressed the compression settlement of the expanded polystyrol. Studying the compression settlement of the backfill, the present paper discusses the relationship between compression settlement around culverts and vertical earth pressure reduction effect.
