Paper Title:
Dynamic Shear Modulus and Damping Ratio for Threshold Strain in Cohesionless Soils
  Abstract

Based on modern ideas of thermomechanics, small strain dynamic dissipation function of Hardin-Drnevich model for soils is formulated using the assumptions of the beeline and the skeleton curve shift laws. Fundamentally, for cohesionless soils, two types of cyclic strain thresholds are identified: first threshold strain and second threshold strain represent boundaries between fundamentally different dynamic characteristics of cyclic soil behavior. Comparison between the two threshold shear strain values and dynamic degradation curves obtained on exactly the same soils, the results showed that the ratio of secant modulus and maximum dynamic shear modulus for the first threshold strain are almost 1.0, and the damping ratio is almost constant. When dynamic strain level exceeds the second threshold strain, the soil behavior is considerably at nonlinear, and the primary deformation mechanism is related to fabric changes during cyclic loading. The first and the second threshold strains are therefore essential for the understanding and solving soil dynamic problems.

  Info
Periodical
Chapter
Chapter 7: Building Materials
Edited by
Paul P. Lin and Chunliang Zhang
Pages
1603-1606
DOI
10.4028/www.scientific.net/AMM.105-107.1603
Citation
X. X. Guo, "Dynamic Shear Modulus and Damping Ratio for Threshold Strain in Cohesionless Soils", Applied Mechanics and Materials, Vols. 105-107, pp. 1603-1606, 2012
Online since
September 2011
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Price
$32.00
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