THE RIGIDITY EVALUATION METHOD OF EMBANKMENT USING FWD

The intensity of compaction in railway embankment is controlled by K30-value in the plate loading test. However, the plate loading test takes much time and needs a large reaction equipment. Therefore, FWD was examined as a convenient method and substitution for plate loading test. As a result, K-value from FWD correlates with K30-value, and it was confirmed that FWD could be applied to control compaction degree. For the purpose of using FWD practically as controlling compaction degree of embankment, test results was classified into every type of the soil, and relationship between rigidity of subgrade, K30-value and K-value from FWD was summarized. As a result, it was found out that the relation between K-value from FWD and K30-value were 1:1 when the rigidity of subgrade is low, also its relation became 1:2 when the rigidity is high.