Abstract
Plate loading tests for several soils compacted in two cylindrical pits of different size were performed. Repeated loading and impact loading using handy type falling weight deflectometer (HFWD) were applied for these tests. The relation between load intensity and plate deflection from these tests was applied to the theoretically computed graphs, and the values of Poisson's ratio and modulus of deformation of the soils were estimated. Smooth and rough conditions along the side surface of the cylinders were assumed for the theoretical solutions. The results obtained indicated that the difference in the modulus of deformation between the two side surface conditions was less than 7%. The modulus of deformation increased gradually with the number of loading, but the ratio of it after ten thousand times loading to ten times loading was less than about 1.5. Except for dune sand, the ratio of cumulative deflection after million times loading to ten times loading was less than 2. The modulus of deformation obtained from HFWD was less than 60% of that obtained from the unloading process of repeated loading.
