This paper concerns the liquefaction judgment method of diluvia sandy soil layer. Diluvia sandy soil layers are excepted from the target layers of liquefaction judgment methods in plans for road earthwork. However, a diluvia sandy soil layer (Ds1 ), which exhibits very low standard penetration test values (N -value) is distributed over the construction site of the Ken-Oh Expressway in Sakai-cho Sashima-gun, Ibaragi Prefecture. This diluvia sandy soil layer has an N -value of almost 1-4. We analyzed the layers using two liquefaction judgment methods. First, the N -value method was used, and then another method which utilizes cyclic undrained triaxial test results was employed. Following that, residual deformation analyses (based on the ALID program) for the event of an earthquake occurring was carried out using the factor of liquefaction value(F_(L) -value). The results of these analyses suggest that the liquefaction judgment method using the cyclic undrained triaxial test results is suitable for the evaluation of the F_(L) -value for very low N -value diluvia sandy soil layer.
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