不飽和土の繰返し弾塑性構成式を用いた三相系多孔質体理論に基づく盛土の地震応答解析;不飽和土の繰返し弾塑性構成式を用いた三相系多孔質体理論に基づく盛土の地震応答解析;Dynamic Analysis of Embankment Based on Three Phase Porous Media Theory Using Elasto-Plastic Constitutive Model for Unsaturated Soil