Anisotropic Shear Modulus due to Stress Anisotropy

by Stephan K. Roesler, Research Engr.; Inst. of Soil Mechanics and Rock Mechanics, Univ. of Karlsruhe, Karlsruhe, Federal Republic of Germany,


Serial Information: Journal of the Geotechnical Engineering Division, 1979, Vol. 105, Issue 7, Pg. 871-880


Document Type: Journal Paper

Discussion: Hardin Bobby O. (See full record)
Discussion: Woods Richard D. (See full record)
Closure: (See full record)

Abstract: By special measurement technique it is shown that the dynamic shear modulus in homogenous isotropic sand samples depends upon the direction of stress. Furthermore it can be demonstrated that the shear modulus is not related to the first invariant of stress tensor as assumed hitherto, but to the respective stress component itself. Measurements were performed making use of the cross correlation method and stochastic shear wave excitation by a special shear wave exciter that avoids the generation of p waves. Polarized shear waves were generated in a cubical sand sample and the shear wave velocity was measured independent of the value and the direction of the stress in the sample. Due to the sensivity of the correlation method small vibration amplitudes could be applied, such that a linear stress-strain relation could be assumed. It was shown that the placing technique of the sand had no influence upon the test results.

Subject Headings: Shear waves | Shear modulus | Shear stress | Wave measurement | Wave generation | Soil modulus | Wave velocity | Stress strain relations

Services: Buy this book/Buy this article

 

Return to search