The Damping Capacity of Some Granular Soils

Weissmann, G. F.; Hart, Robert D.

doi:10.1520/stp44376s

Cited by 4 publications

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“…There have been extensive investigations on the dynamic shear modulus and the damping ratio of a wide range of soil types. Considerable early efforts (e.g., Hardin and Drnevich, 1972;Seed and Idriss, 1970;Silver and Seed, 1971;Weissman and Hart, 1962) have been mostly focused on sands; they provided valuable experimental results of these two parameters which evolved with the shear strain, and accordingly developed theoretical estimations for these parameters that were considered functions of the shear strain. For example, Silver and Seed (1971) used cyclic load simple shear tests to investigate the performance of soil at higher shear strain amplitude and reported that the dynamic modulus values at upper limit of shear strain amplitude are lower than those at lowest values of shear strain.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of the Dynamic Shear Modulus and Damping Ratio of Calcareous Sand in the South China Sea

Lan

Diwakar

et al. 2021

Journal of Coastal Research

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The marine deposits in the South China Sea are characterized by an abundance of calcareous sand. The dynamic characteristics and properties of this sand are important for potential engineering seismic analysis and infrastructure development in this oil-and gas-rich region. The present study aims to investigate the dynamic shear modulus and damping ratio of typical calcareous sand in the South China Sea. A series of dynamic triaxial tests under the strain control condition of cyclic loading were conducted, with a specific focus on the effects of relative density and confining pressure. The normalized dynamic shear modulus increases with the increase in confining pressure, and the shear modulus-shear strain relationship can be adequately described with the well-known Hardin-Drnevich model. However, the influence of confining pressure tends to decline in the sand samples of high initial relative density. Overall, the variations in the damping ratio as affected by confining pressure or relative density are not very significant. The experimental results were assessed and found to be reasonably consistent with some of the previously reported results in the literature.

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Section: Introductionmentioning

confidence: 99%

An Experimental Study of the Dynamic Shear Modulus and Damping Ratio of Calcareous Sand in the South China Sea

Lan

Diwakar

et al. 2021

Journal of Coastal Research

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A Mathematical Model of a Vibrating Soil-Foundation System

Weissmann¹

1966

Bell System Technical Journal

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The displacement amplitudes and the phase angles of vertically vibrating rigid circular plates on an elastic isotropic homogeneous half‐space have been expressed in terms of the mass of the plate, the static spring constant multiplied by a frequency‐dependent function, and a damping term. The results have been modified to apply to vibrating soil‐foundation systems. The effects of hysteresis damping, nonlinear load‐deflection characteristics of soils, the static prepressure, the change of soil properties with depth, and the difference between static and dynamic stress‐strain relations of soils have been considered. The mathematical model has been compared with data on vibrations of circular foundations. The agreement between the model and the experimental data for cohesive soils is very good.

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Dynamic Mechanical Analysis Test for Evaluating Loose Sands on a Wide Strain Range—Application to the InSight Mission on Mars

Chaparro López,

Castillo-Betancourt,

Cabrera

et al. 2023

Geotechnical Testing Journal

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The dynamic properties of loose sands under low stresses are an unexplored topic in soil dynamics because these soil conditions are uncommon in most geotechnical structures on Earth. However, low densities and low-stress conditions prevail on other planets, like, for instance, the surface of Mars, for which particular attention is presently given through the InSight NASA mission. This work presents a new procedure for measuring the dynamic properties of loose sand under low stress by using the dynamical mechanical analysis (DMA) tester, a technique commonly used in asphalt engineering but not in geotechnical engineering. Compared to traditional geotechnical methods (resonant column and cyclic triaxial tests), DMA investigates a broader range of strains using a single apparatus. In this work, we assess the dynamical properties of loose fine sand Dr ≈ 0.2, considered a possible Mars regolith analog, by varying the input strain from γ = 10−6 to γ = 10−2 while applying confining pressures from σ3 = 3 kPa to σ3 = 30 kPa. The results validate the proposed procedure, showing an increment of the shear modulus as the confining pressure increases. Furthermore, they highlight DMA’s advantages for studying the dynamic properties of granular soils under low stress and strain.

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The Damping Capacity of Some Granular Soils

Cited by 4 publications

References 0 publications

An Experimental Study of the Dynamic Shear Modulus and Damping Ratio of Calcareous Sand in the South China Sea

An Experimental Study of the Dynamic Shear Modulus and Damping Ratio of Calcareous Sand in the South China Sea

A Mathematical Model of a Vibrating Soil-Foundation System

Dynamic Mechanical Analysis Test for Evaluating Loose Sands on a Wide Strain Range—Application to the InSight Mission on Mars

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