Effect of uncertainties in geometry, inter-layer boundary and shear strength properties on the probabilistic stability of a 3D embankment slope

Effect of uncertainties in geometry, inter-layer boundary and shear strength properties on the probabilistic stability of a 3D embankment slope

Varkey, D. (TU Delft Geo-engineering)
Hicks, M.A. (TU Delft Geo-engineering)
Vardon, P.J. (TU Delft Geo-engineering)

2022

This paper investigates the influence of three forms of uncertainty on the probabilistic stability of an idealised 3D embankment slope. These are: 1D spatial variability in the external geometry of the slope along its length, 2D spatial variability in the depth of the boundary between the embankment material and the foundation layer, and 3D spatial variability in the shear strength properties of the slope and foundation materials. The relative influence of each uncertainty has been investigated using the random finite element method, based on statistics consistent with a Dutch regional dyke. The results indicate that, for such a structure, the soil spatial variability has a much greater influence than uncertainties relating to embankment geometry and inter-layer boundary. In particular, it is demonstrated that the spatial correlation of material properties along the length of the embankment has a greater influence on the probabilistic characteristics of the embankment slope stability and failure consequence than the spatial correlation of properties perpendicular to it. A worst case scale of fluctuation for the material properties is identified.

Geometry
random finite element method
slope stability
spatial variability
three dimensional

http://resolver.tudelft.nl/uuid:bab6f968-2a07-4def-a0b7-f9386da371e2

https://doi.org/10.1080/17499518.2022.2101066

1749-9518

Georisk: assessment and management of risk for engineered systems and geohazards, 17 (2), 262-276

Institutional Repository

journal article

© 2022 D. Varkey, M.A. Hicks, P.J. Vardon