To derive an elastic modulus of the ground by relatively easy work.
A load value and displacement of a time series by a FWD test are acquired by a load acquiring part 210 and a displacement acquiring part 210. The corresponding relationship of the both is derived from a load and the displacement measured by the FWD test, and the shift processing of the relationship between the load and the displacement is performed by a load displacement relationship shift part 240 so as to remove an influential part such as an end surface error from the corresponding relationship. An elastic modulus deriving part 250 derives the elastic modulus on the basis of the relationship between the load and the displacement shifted by the load displacement relationship shift part 240.
SARAUMI AKIO
NAGASAWA MASAAKI
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