DYNAMIC PROPERTIES OF HARD GLACIAL TILL

A specialized sampling and testing program was developed and implemented to investigate the dynamic properties of a hard glacial till deposit on the southern shore of Lake Ontario, which will support the foundations of a nuclear power plant. Shear moduli were found to be influenced significantly by sample disturbance, stress history, stress system during consolidation and by the compresibility of the test equipment. Special precautions were taken to minimize sample disturbance and special efforts were undertaken to simulate the in-situ stress history. Tests were conducted on isotopically and anisotropically consolidated specimens to evaluate the effects of the stress system during consolidation on the dynamic properties of the till. Corrections were applied to the measured moduli to account for the effects of the compressibility of the test apparatus. The shear moduli obtained from this test program, were 3.5 to 4.5 times higher than shear moduli obtained from tests conducted using conventional test procedures. There was good agreement between the corrected shear moduli extrapolated to very low shear strains and shear moduli obtained from field geophysical tests. /Author/

• Supplemental Notes:
  • From Volume I of Earthquake Engineering and Soil Dynamics--Proceedings of the ASCE Geotechnical Engineering Division Specialty Conference, June 19-21, 1978, Pasadena, California. Sponsored by Geotechnical Engineering Division of ASCE in cooperation with: ASCE Technical Council on Lifeline Earthquake Engineering, ASCE Los Angeles Section of their Geotechnical Engineering Group, Earthquake Engineering Research Institute, Soil and Foundation Engineers Association, Structural Engineers Association of Southern California, U.C.L.A. College of Engineering, University of Southern California, and California Institute of Technology.
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Murphy, D J
  • Koutsoftas, D
  • Covey, J N
  • Fischer, J A
• Conference:
  • From Volume I of Earthquake Engineering and Soil Dynamics--Proceedings of the ASCE Geotechnical Engineering Division Specialty Conference, June 19-21, 1978, Pasadena, California. Sponsored by Geotechnical Engineering Division of ASCE in cooperation with:
• Publication Date: 1978-6

Media Info

• Features: Appendices; Figures; References;
• Pagination: p. 636-659

Subject/Index Terms

• TRT Terms: Anisotropy (Physics); Compressibility; Consolidations; Dynamics; Field tests; Foundations; Isotropy; Shear modulus; Strain (Mechanics); Till
• Old TRIS Terms: Anisotropy; Insitu methods; Strains
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00179772
• Record Type: Publication
• Report/Paper Numbers: Proceeding
• Files: TRIS
• Created Date: Oct 12 1978 12:00AM