This study is a continuation of a previous one by Siegel (1975) and deals with computerized slope stability analysis. All investitations are related to a computer program, STABL, which performs analyses of general slope stability problems. A parametric study was conducted on the STABL program. The study showed that variations in the soil strength parameters c and 0 have the largest influence on the stability of a slope. The STABL program was mdified to provide additional options in terms of a new sliding block surface generator, several piezometric surfaces,and the modified Bishop factor of safety for circular failure surfaces. Results of analysis performed with STABL were compared to results obtained with other methods of slope stability analysis. Results by STABL are in general conservative, but the difference is usually less than 10%. However, for deep circular failure surfaces in soil with strength defined mainly in terms of a strength intercept c, the simplified Janbu method of slices normally applied in the STABL solution may give erroneous and nonconservative results. In such cases, the modified Bishop method should be used. The modified STABL program, STABL2, is written in Fortran IV source language, developed for a CDC 6500 computer, and is also available in a form compatible with the IBM 360 (or 370) computer system. Both versions are verified.

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  • Supplemental Notes:
    • Prepared in cooperation with Indiana State Highway Commission. Report number FHWA/IN/JHRP-77/26, "Computerized Slope Stability Analysis for Indiana Highways, Vol. II: STABL2 Program," consists of Appendices D-F.
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284

    Purdue University

    Joint Transportation Research Program
    West Lafayette, IN  United States  47907-2051

    Indiana Department of Transportation

    100 N Senate Avenue
    Indianapolis, IN  United States  46204

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Boutrup, E
  • Publication Date: 1977-12

Media Info

  • Features: Appendices; Figures; Photos; Tables;
  • Pagination: 512 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00178858
  • Record Type: Publication
  • Report/Paper Numbers: JHRP-77-25 Final Rpt., JHRP-77-26 Final Rpt.
  • Created Date: Aug 19 1978 12:00AM