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Optimized Slip Surfaces for Undrained Loading of Embankments on Lake Agassiz Clays
Undrained strength of Lake Agassiz clays in the Fargo, ND, area have a relatively low rate of increase in strength with depth. When using automated optimization algorithms within limit equilibrium software for selecting a critical slip surface, a deep V-shaped wedge mechanism with a factor of safety 15% to 30% lower than a critical circle may be calculated. That optimized limit equilibrium surface may be disregarded as kinematically inadmissible; however, decisions would then be based on circular surfaces that may not be truly optimized. This paper compares limit equilibrium solutions for undrained embankment stability to a simple analytical upper bound, as well as to numerical upper bound and lower bound solutions, to aid in selecting the factor of safety for an appropriate optimized critical slip surface.
Optimized Slip Surfaces for Undrained Loading of Embankments on Lake Agassiz Clays
Undrained strength of Lake Agassiz clays in the Fargo, ND, area have a relatively low rate of increase in strength with depth. When using automated optimization algorithms within limit equilibrium software for selecting a critical slip surface, a deep V-shaped wedge mechanism with a factor of safety 15% to 30% lower than a critical circle may be calculated. That optimized limit equilibrium surface may be disregarded as kinematically inadmissible; however, decisions would then be based on circular surfaces that may not be truly optimized. This paper compares limit equilibrium solutions for undrained embankment stability to a simple analytical upper bound, as well as to numerical upper bound and lower bound solutions, to aid in selecting the factor of safety for an appropriate optimized critical slip surface.
Optimized Slip Surfaces for Undrained Loading of Embankments on Lake Agassiz Clays
Schneider, James A. (author) / Foss, Jason R. (author) / Schmidt, Luke L. (author) / Behling, Christopher W. (author)
Geo-Congress 2020 ; 2020 ; Minneapolis, Minnesota
Geo-Congress 2020 ; 818-828
2020-02-21
Conference paper
Electronic Resource
English
Optimized Slip Surfaces for Undrained Loading of Embankments on Lake Agassiz Clays
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