| 抄録（英）： |
Shallow soil layers are not fully saturated in some situations because of a small amount of air included in the pore water. The dynamic behavior of partially saturated soils differs considerably from that of fully saturated soils due principally to the compressibility of pore fluid. In this paper, the response of a highly saturated sand layer to the seismic vertical excitation is analyzed based on Biot's formulation and the concept of homogeneous fluid. The solutions for the responses of the displacement, pore pressure and relative flow velocity are obtained. The effect of degree of saturation on the responses, especially, on the seismic amplification is studied. In addition, the individual contributions from the first and second dilatational waves on the responses are investigated. This would provide a better understanding of Biot's two-phase theory as applied to the present model.
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