Hardin compares his three-dimensional elasto-plastic equations with the test results in the original paper and confirms that shear modulus depends on the stress direction. However, Schmertmann and Wood cite their own testing of sand samples to measure p-wave and s-wave velocity which found no dependence of the shear modulus. In his closure, Roesler notes that Schmertmann and Wood's measurements of shear wave velocity may include a maximum error of 25 percent. More accurate results are very difficult to obtain if the p-wave superpose the exact first arrival of the s-waves. Therefore, in his original research, Roesler has avoided exciting p-waves and used the cross-correlation technique to get a mean value of about 2 to the 17th power s-wave impulses. This allowed measuring of variations in s-wave velocity with an error of not more than 0.1 percent.

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  • Accession Number: 00319433
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 15640
  • Files: TRIS
  • Created Date: Jan 19 1981 12:00AM