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Elastic-plastic Stability Analysis of Mine-waste Embankments.
Corp-EL; Schuster-RL; McDonald-MM
NTIS: PB 249 694 :98 pages
Seepage forces computed by a finite-element flow program are combined with gravity forces in an elastic-plastic stress-analysis program to determine the stability of mine-waste slopes. Computer output provides a cross-sectional plot of the dam or embankment showing the safety factors for each element. The combined finite- element program called seep-slope was used to analyze several trial embankments and the 1972 Buffalo Creek dam failure. Safety factors computed by the finite-element method (fem) were compared with those computed by bishop limiting-equilibrium method. For individual slip circles, there was little correlation between the factors of safety computed by the two methods. Both predict failure, but fem shows a different mode of failure plus development of potential failure zones not indicated by conventional methods. Besides having a better theoretical basis than the bishop method, fem requires no assumptions regarding the location or geometry of the failure surface. As a result, the program will show progressive development of a failure zone, and areas can be pinpointed where remedial measures should be taken. In addition, nonhomogeneous cross sections can be analyzed, and zones of potential piping can be defined.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 249 694
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division