Centrifugal modeling test on abutment backfill with EPS inclusion

The EPS inclusion was put into backfill and abutment to reduce soil pressure of abutment back. The structure with both geogrid reinforcement and EPS inclusion was tested. According to the same strain principle, the structures, ground, backfill, geogrid and EPS inclusion were modeled. When the scale ratio n was 20, the strain of geogrid was studied by digital image analysis technology. It is pointed that the soil pressure of abutment with a collapsible inclusion is reduced markedly, but the settlement of backfill without geogrid increases. Compared to the former, the settlement of the structure with both reinforcement and collapsible inclusion is much less, and the stress of geogrid increases obviously. The results indicate that EPS inclusion is beneficial to make full use of reinforcement, so it is very usefull for practical engineering.