This research involves calculating the state of stress in a soil mass by recognizing that disturbance during testing or measuring is inevitable. Thin blades with teflon-diaphragm pneumatic stress cells have been developed for this research to measure soil stresses. Soil stresses on the blade were found to be a function of blade thickness. An exponential relationship between blade thickness and soil stresses was determined to exist except in hard soils with thick (1/4 inch) blades. Pressuremeter data from two test sites, one in Glacial till and loess, the other in expansive clay, indicated very close agreement with blade stress results. The blade was easier to use than the pressuremeter and because of its statistical advantage (many more test results per day), is more precise. A three-bladed stepped vane with nine pressure cells has been successfully designed, built, and tested in preliminary trials. Use of this instrument will result in the measurement of a two dimensional soil stress state. (FHWA)

  • Corporate Authors:

    Soil Systems, Incorporated

    525 Webb Industrial Drive
    Marietta, GA  United States  30062

    Federal Highway Administration

    Engineering Research and Development Bureau, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Fox, N S
    • Handy, R L
    • Trott, G D
    • Remmes, B
    • Moldt, S
  • Publication Date: 1981-8

Media Info

  • Pagination: 205 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00345098
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-RD-81-118 Final Rpt., FCP 35B2-552
  • Contract Numbers: DOT-FH-11-9172
  • Files: TRIS, USDOT
  • Created Date: Jan 29 1982 12:00AM