The details are given of a nondestructive monitoring system for assessing dam stability. The paper also includes a brief review of soil behavior in light of its deformation under stress, and discusses previously published acoustic emission studies. Acoustic emission research results and laboratory test results on numerous soil samples, as well as the results of evaluatory tests of instrumented earth dams are presented. The new techniques, which recognizes that soil as an earth dam construction material fails when the deformation proceeds to a point where its shear strength is exceeded, is based upon the acoustic emissions generated by the deforming soil mass during the interparticle shearing process. These acoustic emissions are brought from within the soil mass to the accelerometer pickup by means of metal rod wave guides. The emissions are then amplified and counted using conventional equipment. The results of instrumentation of three earth dams ranging in height from 30 to 67 ft. indicate that: dams that do not generate emissions are not deforming; dams with moderate emission are deforming slightly; and dams with large emissions are deforming to high degree and are unstable. The need is indicated for further study: frequency/amplitude distribution of the emissions in various soil types, moisture states etc.; and the optimum positioning of wave guides.

  • Supplemental Notes:
    • This report was presented at the National Conference on Control of Hazardous Material Spills, August 25-28, 1974 San Francisco, California.
  • Corporate Authors:

    National Conf on Control of Hazard Material Spills

    Houston, TX  United States 
  • Authors:
    • Koerner, R M
    • Lord Jr, A E
  • Publication Date: 1974-8

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 9 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00098672
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 30 1975 12:00AM