This fourth report covers Phase III field sampling and pressurementer tests at six shale embankments and laboratory tests on undistrubed embankment samples and on unweathered samples of parent shales used in the embankments. The six embankments, in Tennessee, West Virginia, Kentucky, Ohio (two), and Indiana were selected to cover a range in age and performance for shales placed as rockfill at three sites and as soilfill at three sites. Special K sub 0 CU triaxial compression and density tests on 5-in.-diameter embankment samples provided data on in situ density, modulus, and shear strength. Pressuremeter tests gave supplemental modulus and strength data. Embankment samples showed shale deterioration to be minor, except at the Indiana embankment, compared wiht softening of random mixtures of soil, shale, and rock placed during construction at the other sites. Predicted settlement from modulus data was smaller than actual settlements. Undrained strength of saturated laboratory compacted shales correlated with in situ strength. Unweathered parent shales were used for jar soaking and slake-durability index tests, point load tests, compaction tests, and soaked compression tests. Point load index appears promising for field identification of rocklike shales if correlations are made during design studies. Compaction tests on modeled gradations can be used for coarse graded shales. Soaked compression of minus 3/4-in. compacted shale correlated with slake-durability index and can be used to estimate long-term settlement. /FHWA/

  • Supplemental Notes:
    • Sponsored by the Federal Highway Administration.
  • Corporate Authors:

    U.S. Army Waterways Experiment Station

    3909 Halls Ferry Road
    Vicksburg, MS  United States  39180-6199
  • Authors:
    • Strohm Jr, William E
  • Publication Date: 1978-10

Media Info

  • Pagination: 154 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00189357
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-78-140 Intrm Rpt., FCP 34D5-012
  • Files: TRIS, USDOT
  • Created Date: Apr 12 1979 12:00AM