An extensive program of direct and triaxial tests on mine spoil samples taken from various parts of eastern Kentucky indicates that their shear strength may not vary as much as expected. The effective strength parameters were not affected significantly by moisture content and density. A cohesion of 200 psf (9.6 kN/sq m) and a friction angle of 30 degrees may be used as an estimate for a typical spoil in a loose and wet condition. The exclusion of large-size particles should not have significant effect on the shear strength of mine spoils. The small amount of isolated large particles is actually surrounded by a matrix of fine materials, so the shear strength is principally governed by the fine friction. A comparison between the results of direct shear and triaxial tests on mine spoils has indicated that both tests yield comparable shear strength, even though the former limits the maximum particle size to No. 4 sieve (4.76 mm) while the latter to 3/4 in. (19.1 mm).

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  • Supplemental Notes:
    • Discussion of Proceeding Paper 12925 by Yang H. Huang, May, 1977.
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  United States  10017-2398
  • Discussers:
    • Huang, Y H
  • Publication Date: 1978-9

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Filing Info

  • Accession Number: 00183212
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 13999
  • Files: TRIS
  • Created Date: Nov 14 1978 12:00AM