飽和砂質地盤への複合体理論の適用性について

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タイトル別名
  • ON APPLICABILITY OF MULTI-PHASE THEORY OF THE AGGREGATE BODY ON A WATER-SATURATED SANDY SOIL GROUND
  • ホウワ スナシツ ジバン エ ノ フクゴウタイ リロン ノ テキヨウセイ ニ ツイテ

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In this paper is investigated the applicability of the multi-phase theory of the aggregate body on a water-saturated sandy soil ground, referring to numerical results on the wave propagation problem of body or Rayleigh waves and the evaluation of the dynamical Poisson's ratio or other physical parameters. According to this investigation, the phase velocity of the first kind dilatational wave almost coinsides with that of water wave in soft soil ground. On the other hand, the phase velocity of the second kind dilatational wave is smaller than that of the first kind wave. The attenuation coefficients of the second kind wave is much larger than that of the first kind wave. The velocity of the rotational wave is nearly equal to the travelling velocity of the porous elastic solid under consideration of the mass effect of the pore water. In some parameter range, two kinds of Rayleigh waves exist in the aggregate body under a pervious or impervious free boundary. In general, the first kind Rayleigh wave exists in it, but the second kind Rayleigh wave disappears and changes in the second kind dilatational wave in the case of the large value of Poisson's ratio. Even in the case of the small value of shear rigidity, the computed value of the dynamical Poisson's ratiois nearly equal to be 0.5. It is, in essential, necessary to use the soil aggregate model under the multi-phase theory for the existence of two second kind dilatational and Rayleigh waves with high attenuation propperty, because such soil aggregate model is able to make clear the radiation damping together with the internal dissipation energy of these second kind waves in a soil-structure interaction problem.

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