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Back Analysis of Slope Failures to Design Landslide Stabilizing Piles
It is generally accepted that shear strength parameters obtained by back analysis of slope failures ensure more reliability than those obtained by laboratory or in situ testing when used to design remedial measures. In many cases, back analysis is an effective tool, and sometimes the only tool, for investigating the strength features of a soil deposit. The fundamental problem involved is always the data quality and consequently the back analysis approach must be applied with care and the results interpreted with caution. Procedures to determine the magnitude of both shear strength parameters (c′ and ϕ′) or the relationship between them by considering the position of the actual slip surface within the failed slope are discussed. Using the concept of limit equilibrium the effect of any remedial measure (drainage, modification of slope geometry, restraining structures) can easily be evaluated by considering the intercepts of the c′−tan ϕ′ lines for the failed slope (c′0, tan ϕ′0) and for the same slope after installing some remedial works (c′nec, tan ϕ′nec), respectively. This procedure is illustrated to design piles to stabilize landslides taking into account both driving and resisting force acting on each pile in a row as a function of the nondimensional pile interval ratio B/D. The accurate estimation of the lateral force on pile is an important parameter for the stability analysis because its effects on both the pile- and slope stability are conflicting. That is, safe assumptions for the stability of slope are unsafe assumptions for the pile stability, and vice versa. Consequently, in order to obtain an economic and safe design it is necessary to avoid excessive safety factors.
Back Analysis of Slope Failures to Design Landslide Stabilizing Piles
It is generally accepted that shear strength parameters obtained by back analysis of slope failures ensure more reliability than those obtained by laboratory or in situ testing when used to design remedial measures. In many cases, back analysis is an effective tool, and sometimes the only tool, for investigating the strength features of a soil deposit. The fundamental problem involved is always the data quality and consequently the back analysis approach must be applied with care and the results interpreted with caution. Procedures to determine the magnitude of both shear strength parameters (c′ and ϕ′) or the relationship between them by considering the position of the actual slip surface within the failed slope are discussed. Using the concept of limit equilibrium the effect of any remedial measure (drainage, modification of slope geometry, restraining structures) can easily be evaluated by considering the intercepts of the c′−tan ϕ′ lines for the failed slope (c′0, tan ϕ′0) and for the same slope after installing some remedial works (c′nec, tan ϕ′nec), respectively. This procedure is illustrated to design piles to stabilize landslides taking into account both driving and resisting force acting on each pile in a row as a function of the nondimensional pile interval ratio B/D. The accurate estimation of the lateral force on pile is an important parameter for the stability analysis because its effects on both the pile- and slope stability are conflicting. That is, safe assumptions for the stability of slope are unsafe assumptions for the pile stability, and vice versa. Consequently, in order to obtain an economic and safe design it is necessary to avoid excessive safety factors.
Back Analysis of Slope Failures to Design Landslide Stabilizing Piles
Developments in Geotechnical Engineering
Rao, V.V.S. (editor) / Sivakumar Babu, G.L. (editor) / Popescu, M. E. (author) / Schaefer, V. R. (author)
2015-08-29
12 pages
Article/Chapter (Book)
Electronic Resource
English
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