In-situ testing methods for dynamic properties of MSW landfills

W. N. Houston, Sandra Houston, J. W. Liu, A. Elsayed, C. O. Sanders

Research output: Chapter in Book/Report/Conference proceedingConference contribution

53 Scopus citations


Cost-effective techniques have been developed for measuring P and S-wave velocities and in-situ shear strength for landfill waste materials. These techniques include both surface profiling and downhole measurements to capture the typical velocity inversion which accompanies a compacted soil cover. The measurement scheme is basically a simplified tomography survey which characterizes the material within a large cone around the borehole. A computer code is being developed to fit the data to a statistical model for each cone. Using a least-squares fit the code will automatically iterate to mean values and quantify the local variability (on a scale of 5 to 20 m). Variability across the landfill is assessed by repeating the measurements at several locations. Static shear strength of landfill materials is also being measured with a large-scale (1.22m × 1.22m) in-situ direct shear box. Because it is common practice to use a percentage of the static strength as the seismic strength in obtaining yield accelerations, these static strengths are useful for earthquake analyses. Attempts will be made to correlate these in-situ shear strengths with wave velocities and moduli at the same locations when more in-situ strength data are available.

Original languageEnglish (US)
Title of host publicationGeotechnical Special Publication
Number of pages10
StatePublished - 1995
EventProceedings of the Geotechnical Engineering Division of the ASCE in Conjunction with the ASCE Convention - San Diego, CA, USA
Duration: Oct 23 1995Oct 27 1995


OtherProceedings of the Geotechnical Engineering Division of the ASCE in Conjunction with the ASCE Convention
CitySan Diego, CA, USA

ASJC Scopus subject areas

  • Soil Science
  • Building and Construction
  • Architecture


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