円柱共振試験によって求められた動弾性係数への土の粘性および半径方向慣性の影響(農業生産工学)

概要

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It has been recongnized that the dynamic Young's modulus of compacted cohesive soils is considered to be a function of many factors including viscosity and Poisson's ratio. However, we had not sufficient information about the dynamic Young's modulus in consideration of viscosity and radial inertia in resonant-column test. In order to provide a more detailed estimate of the relationship among these three constants, the author attempted to analyze the differential equation of longitudinal vibration of cylindrical soil specimen introduced by energy method taking the radial inertia caused by Poisson's ratio and the viscosity based on the assumption of Voigt type viscoelastic body for cohesive soils. From the solution of this differential equation, we obtained the results as follows : (1) The dynamic Young's modulus is composed of two terms represented by the resonant frequency and viscosity of the soil specimen. (2) When the value of additional mass attached on the top of the soil specimen increases, the term of the resonant frequency gives the significant effects and the term of the viscosity reduces the effects to the dynamic Young's modulus. (3) The effects of Poisson's ratio to the dynamic Young's modulus are very small.
神戸大学の論文