Understanding and modelling the whole instability mechanisms of a slope is a fundamental issue from a scientific and technical viewpoint. To date, small strain Lagrangian approaches are mostly used in solid mechanics for modelling the failure stage while Eulerian approaches are common in fluid mechanics for propagation analysis. Consequently, a combination of both approaches allows analysing the stability, the failure and the propagation stages in a unique mathematical framework. To this aim, the paper adopts a finite element method with Lagrangian integration points (FEMLIP) which is currently implemented in the ELLIPSIS code and it has been formerly used for applications in geophysics and civil engineering. This method combines the robustness of an Eulerian mesh with the flexibility of a set of Lagrangian particles which allows accounting for the history of the material. In this paper, FEMLIP is firstly validated referring to benchmarks with analytical solutions and it is then tested for the large deformation drained analysis of a vertical cut in coarse-grained soils. The obtained results are compared with those provided by standard engineering methods such as (1) limit equilibrium method (LEM), (2) standard stress–strain elasto-plastic FEM analysis. As a whole, the comparison underlines that FEMLIP is a reliable method to analyse both the stability and the instability of a vertical cut, so highlighting that it can be confidently used to analyse more complex problems related to natural slopes.

Large deformation FEMLIP drained analysis of a vertical cut

CUOMO, SABATINO;CASCINI, Leonardo;
2012

Abstract

Understanding and modelling the whole instability mechanisms of a slope is a fundamental issue from a scientific and technical viewpoint. To date, small strain Lagrangian approaches are mostly used in solid mechanics for modelling the failure stage while Eulerian approaches are common in fluid mechanics for propagation analysis. Consequently, a combination of both approaches allows analysing the stability, the failure and the propagation stages in a unique mathematical framework. To this aim, the paper adopts a finite element method with Lagrangian integration points (FEMLIP) which is currently implemented in the ELLIPSIS code and it has been formerly used for applications in geophysics and civil engineering. This method combines the robustness of an Eulerian mesh with the flexibility of a set of Lagrangian particles which allows accounting for the history of the material. In this paper, FEMLIP is firstly validated referring to benchmarks with analytical solutions and it is then tested for the large deformation drained analysis of a vertical cut in coarse-grained soils. The obtained results are compared with those provided by standard engineering methods such as (1) limit equilibrium method (LEM), (2) standard stress–strain elasto-plastic FEM analysis. As a whole, the comparison underlines that FEMLIP is a reliable method to analyse both the stability and the instability of a vertical cut, so highlighting that it can be confidently used to analyse more complex problems related to natural slopes.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/3137642
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