Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/25864
Title: Limit equilibrium method based on an approximate lower bound method with a variable factor of safety that can consider residual strength
Authors: Cheng, YM 
Li, DZ
Li, L
Sun, YJ
Baker, R
Yang, Y
Keywords: Extremum principle
Factor of safety
Global minimum
Harmony search
Local minimum
Particle swarm
Progressive yielding
Slope stability analysis
Issue Date: 2011
Publisher: Elsevier
Source: Computers and geotechnics, 2011, v. 38, no. 5, p. 623-637 How to cite?
Journal: Computers and geotechnics 
Abstract: In this paper, the factor of safety for a prescribed slip surface will be determined from an equivalent lower bound method (extremum principle), which can satisfy all equilibrium conditions without an interslice force function. This approach will give an overall factor of safety close to that from the classical methods for normal problems, while the thrust line, the local factor of safety for individual slice/block and the progressive yielding phenomenon can be estimated, which will be useful for some special cases. The force and moment equilibrium of every slice will be satisfied, while the location of the thrust line will always be acceptable in the present formulation. To solve the difficult optimisation problem, an innovative coupled particle swarm/harmony search algorithm is proposed in this paper, and a practical engineering problem for which the factor of safety is close to 1.0 is used to illustrate the consideration of the residual strength in the limit equilibrium slope stability analysis.
URI: http://hdl.handle.net/10397/25864
ISSN: 0266-352X
DOI: 10.1016/j.compgeo.2011.02.010
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