THREE-DIMENSIONAL SLOPE STABILITY ANALYSIS METHOD

Research on slope stability analysis similar to that of the author's indicates that the ordinary method of slices (OMS) is inadequate for the 3-D analysis of frictional slopes and a method taking into consideration the forces on all four vertical sides of soil columns is required. End effects increased as slopes became less frictional, contradicting the author's results which had end effects increasing as stability increases. Also, because the OMS underestimates the frictional resistance on steep shear surfaces, it predicts the failure of frictional slopes taking place along very narrow and deep failure contrary to typical observed failure modes, i.e. it unrealistically predicts that all sandy slopes, regardless of inclination, are unstable. The research also contradicts the author's contention that the ratio of shear surface factory of safety to plane strain factor of safety is relatively insensitive to shear surface width. A comparison of the author's results with those obtained in the wedge analysis used in rock mechanics reveals the former unrealistically predicting all cohesionless slopes being unstable against deep failure modes while the latter predicts narrow wedges are more stable than wide ones. This discrepancy stems from the author implicitly assuming no horizontal force, a factor taken into account in the wedge analysis.

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  • Supplemental Notes:
    • Discussion of Proceeding Paper 13221 by H. John Hovland, September, 1977.
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  United States  10017-2398
  • Discussers:
    • Azzouz, A S
    • Baligh, M M
    • STEINER, W
  • Publication Date: 1978-9

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Filing Info

  • Accession Number: 00183213
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 13999
  • Files: TRIS
  • Created Date: Nov 14 1978 12:00AM