NEHRP Clearinghouse
- Title
- Upper Bound Limit Analysis of the Stability of a Seismic-Infirmed Earthslope.
- File
- PB81117178.pdf
- Author(s)
- Chan, S. W.; Koh, S. L.; Chen, W. F.
- Source
- National Science Foundation, Washington, DC. Engineering and Applied Science., September 1980, 141 p.
- Identifying Number(s)
- CE-STR-80-16
- Abstract
- The upper bound limit analysis of perfect plasticity was applied to obtain a formulation for the critical height of a seismic-infirmed earthslope. Variation of the force magnitude and direction along the slope elevation was accounted for through two orthogonal seismic profiles. A rotational logarithmic spiral proved to be the most critical shape of sliding surface for any seismic profiles. Results for deadweight induced instability and data for constant and linear seismic profiles agree well with existing values. Appreciable reductions in critical heights for a more general horizontal seismic profile were observed. Reductions caused by a vertical seismic profile of similar shape but with relative magnitudes of 0.1 and 0.5 times that of the horizontal profile were shown to be rather insignificant. Determination of the location of the most critical slip-surface for a slope of specific geometry and height also has been demonstrated with this model. Adaptation of this model to future analyses related to seismic-infirmed earthquakes has been facilitated by computer coding.
- Keywords
- LASSIE computer program; Mathematical models; Earthquake engineering; Soil properties; Stress analysis; Computer programs; Slopes; Plastic deformation; Earthquakes