Effect of skeletal flow-independent viscosity on the propagation characteristics of body waves in saturated foundations

Abstract

Abstract: Based on the research results of saturated porous medium, considering the influences of flow-independent viscosity of natural soil, the propagation behaviors of body waves in viscoelastic saturated foundation were studied in the present work. The viscoelastic dynamic coupling model of saturated soil were established by employing Biot model and Kelvin-Voigt linear viscoelastic model. The characteristic equations of body waves in viscoelastic saturated foundation were theoretically derived by Helmholtz potential function decomposition theorem with introducing displacement potential function. The variations law of the wave velocity and attenuation coefficient of body waves with physical parameters such as flow-independent viscosity relaxation time of soil, frequency and permeability were analyzed using a numerical example. The results show that the wave velocity and attenuation coefficient of P₁, P₂ and S waves increase with the extension of relaxation time of soil causes . Frequency and permeability in different ranges have different effects on the wave velocity and attenuation coefficient of P₁, P₂ and S waves.

Key words: viscoelasticity, saturated ground, body wave, wave velocity, attenuation coefficient

CLC Number:

TU435

REN Yuan-yuan. Effect of skeletal flow-independent viscosity on the propagation characteristics of body waves in saturated foundations[J]. Journal of Lanzhou University of Technology, 2023, 49(3): 140-146.

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