EFFECT OF LOAD FORM AND SAMPLE RECONSTITUTION ON TEST RESULTS

Because of the slide in the Lower San Fernando Dam during the San Fernando Earthquake of 9 February 1971, the U. S. Army Corps of Engineers decided to initiate earthquake studies of its hydraulic fill dams located in seismically active areas. As a result of this decision a dynamic analysis of Sardis Dam has been initiated. This paper will present the results of dynamic laboratory tests performed on undisturbed and reconsituted samples. The undisturbed samples were taken with a Hvorslev fixed piston sampler. A number of the samples were drained and frozen prior to transporting to the laboratory; the remaining samples were drained and tapped prior to transporting. Isotropically and anisotropically consolidated cyclic triaxial tests were performed on undisturbed and reconstituted samples of the shell and foundation material. Cyclic triaxial tests were also performed on undisturbed samples of the core material. A special series of cyclic triaxial tests was conducted to evaluate the influence of (a) square and sine wave loading, and (b) specimen reconstitution. Specimen reconstitution was found to have no effect on the shell material and increased the dynamic strength of the foundation material approximately 33 percent. Sine and square wave loadings produced about the same results for the shell material; however, foundation materials were found to be sensitive to wave form. The foundation data produced with the square wave must be multiplied by a factor of 0.8 to make it equal to the sine wave data. /Author/

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 588-599

Subject/Index Terms

Filing Info

  • Accession Number: 00179769
  • Record Type: Publication
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Oct 12 1978 12:00AM