飽和砂質地盤への複合体理論の定式化について

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For the asseismic design of building structures, civil engineers have been interested in the dynamical characteristics of the sub-soil ground, that has been often assumed to be a perfectly or viscoelastic body such as a Voigt solid, so as to obtain the dynamical effect of the sub-soil ground. However, the dynamical characteristics of the sub-soil ground, which substantially, consists of soil particles, airs and waters in its void, cannot sufficiently be explained by such an elastic or viscoelastic body. In order to understand the soil ground as the multi-phase medium, authors consider the Biot's model composed of a porous elastic solid saturated by a viscous fluid in this paper. And we discuss on the formulation of the physical relationship between this model and the water-saturated sandy soil. In Sec. 2 it is mainly pointed out that the damping coefficient b involved in basic Eq. (2. 3-4) is related to Darcy's coefficient of permeability. In Sec. 3 the compatibility conditions are derived from the fact that the dilatations of both the porous elastic solid and the pore fluid in this water-saturated sandy soil can be physically interpreted. In Sec. 4 we introduce the several relationships between the coefficients describing stress-strain relations of this model and constants used in soil engineering. Moreover, in Sec. 5 is represented an approximate method to obtain the shear modulus of this model using the modulus of dry sand. In Sec. 6 are derived the phase velocities and the attenuation factors of body waves and Rayleigh waves. And also it is shown that the boundary permeability conditions at free surface are unable to be expressed by using the only, Darcy's coefficient except some limiting cases.
社団法人日本建築学会の論文
1974-06-30

飽和砂質地盤への複合体理論の定式化について

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