NUMERICAL AND OPTIMIZATION TECHNIQUES APPLIED TO SURFACE WAVES FOR BACKCALCULATION OF LAYER MODULI

This paper contains two methods of determining the pavement moduli and thicknesses using a computer program written in FORTRAN 77. The first method, a simple finite difference technique, is developed for the analysis of generalized Rayleigh waves in multilayered elastic media. The methods, which leads to an eigenvalue problem, is very effective in determining theoretical dispersion curves for pavement systems modeled as layered composite plates with free surfaces at both top and bottom or free surface of the top and rigid base at the bottom. Backcalculation of moduli and thickness is done by an optimization routing developed by Powell based on least squares criterion. The second method determines a theoretical dispersion curve based on Knopoffs technique. Since phase velocities of the wave observed experimentally on pavement structures are complex, suitable modification of Knopoffs algorithm for the geologic model has been made by the authors to account for this effect. For optimization, the same technique is used as mentioned above. Numerical results obtained in the two cases show excellent agreement with previously published solutions obtained by other theories.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0803112602
• Corporate Authors:

  American Society for Testing and Materials (ASTM)

  100 Barr Harbor Drive, P.O. Box C700
  West Conshohocken, PA  United States  19428-2957
• Authors:
  • Hossain, M M
  • Drnevich, V P
• Conference:
  • First International Symposium on Nondestructive Testing of Pavements and Backcalculation of Moduli
  • Location: Baltimore, Maryland
  • Date: 1988-6-29 to 1988-6-30
• Publication Date: 1989-11

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 649-669

Subject/Index Terms

• TRT Terms: Backcalculation; Dispersion (Statistics); Eigenvalues; Free surface; Half spaces (Building); Layer coefficient (Pavements); Modulus; Numerical analysis; Optimization; Pavements; Rayleigh waves; Shear strength; Velocity; Wavelength
• Subject Areas: Data and Information Technology; Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 00795881
• Record Type: Publication
• ISBN: 0803112602
• Report/Paper Numbers: ASTM STP 1026
• Files: TRIS
• Created Date: Jul 6 2000 12:00AM