What is it about?

ABSTRACT: The Poisson's ratio (σ) and the porosity (φ) of surface soils and shallow sediments of glacial origin were determined from compressional and horizontal shear waves. In situ seismic refraction measurements were used for this purpose. Wide variations in σ were caused due to the discrepancy in lithology from one layer to another, the clay content, the air and water saturations and the high degree of heterogeneity. Poisson's ratio increases with depth, increasing water saturation and decreasing porosity for the whole column of the soils and sediments investigated. FOR CITATION: FOR CITATION: Salem, H.S. 2000. Poisson’s ratio and the porosity of surface soils and shallow sediments, determined from seismic compressional and shear wave velocities. Geotechnique. 50 –L (4-August): 461–463. (Published by Institute of Civil Engineers – ICE, UK). https://www.icevirtuallibrary.com/doi/10.1680/geot.2000.50.4.461 and https://www.researchgate.net/publication/245410699_Poisson's_Ratio_and_the_Porosity_of_Surface_Soils_and_Shallow_Sediments_Determined_from_Seismic_Compressional_and_Shear_Wave_Velocities

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Why is it important?

The Poisson's Ratio is a physical measure of engineering materials, and other materials as well. It compares the strength or resistance of the material against deformation in lateral and longitudinal axes of different materials. For instance, it is for aluminium 0.33, which resists lateral deformation more effectively than rubber, which has a Poisson's Ratio of 0.48–0.5. In addition to the Poisson's Ration other physical parameters were also obtained, including porosity and elestic moduli

Perspectives

As presented in this paper, the Poisson's Ratio obtained from seismic (compressional and shear wave) measurements for surface soils and shallow sediments ranges from -0.15 and 0.47, with an average value of 0.35. Interestingly, this paper is one of a few that has recorded negative values of the Poisson's Ratio.

Prof. Dr. Hilmi S. Salem

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This page is a summary of: Poisson's ratio and the porosity of surface soils and shallow sediments, determined from seismic compressional and shear wave velocities, Géotechnique, August 2000, ICE Publishing, DOI: 10.1680/geot.2000.50.4.461.
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