ROCK RIPPABILITY STUDY

THE FEASIBILITY OF PREDICTING QUANTITIES OF RIPPABLE AND NON-RIPPABLE ROCK ON PROPOSED CONSTRUCTION PROJECTS WAS DETERMINED USING SEISMIC SOUNDINGS SUPPLEMENTED BY TEST BORINGS AND ELECTRICAL RESISTIVITY MEASUREMENTS. SIX PROJECTS SCHEDULED FOR CONSTRUCTION IN DIFFERENT GEOLOGIC SETTINGS WERE SELECTED FOR INVESTIGATION AND FIELD WORK HAS BEEN COMPLETED ON ALL SIX. TO DATE, ONLY THREE OF THE PROJECTS HAVE BEEN CONSTRUCTED. NON-RIPPABLE MATERIAL WAS ENCOUNTERED ON ONLY TWO OF THE PROJECTS CONSTRUCTED, AND IT WAS FOUND THAT THE DISTRIBUTION OF THIS MATERIAL WAS ERRATIC DUE TO THE GEOLOGIC CONDITIONS PRESENT. IT ALSO BECAME APPARENT DURING THE COURSE OF THE STUDY THAT THE DEPTH CAPABILITY OF THE SEISMOGRAPH USED, A SOILTEST TERRA-SCOUT, WAS TOO LIMITED TO PERMIT ADEQUATE INVESTIGATION OF CUTS AS LARGE AS THOSE ENCOUNTERED ON THE PROJECTS INVESTIGATED. UNDER THESE CIRCUMSTANCES, IT WAS FELT THAT THE COMPARISON OF PREDICTED AND ACTUAL QUANTITIES OF NON-RIPPABLE MATERIAL ORIGINALLY PROPOSED WOULD BE LESS MEANINGFUL THAN A COMPARISON OF PREDICTED AND ACTUAL DEPTHS TO NON-RIPPABLE MATERIAL, AND THE RESULTS OF THE STUDY HAVE THEREFORE BEEN EVALUATED ON THIS BASIS. /AUTHOR/

  • Corporate Authors:

    Colorado Department of Highways

    4201 East Arkansas Avenue
    Denver, CO  United States  80222

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  United States  20590
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00228657
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: May 13 1970 12:00AM