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Verify the static stability of embankments modelled in 2D, such as embankment dams, embankments and dikes around reservoirs, etc.

The macro command CALC_STAB_PENTE allows you to calculate the safety factor representing the margin of stability available, defined by the ratio between the shear resistance force and the induced driving force by the loads applied. CALC_STAB_PENTE group two categories of methods thus making it possible to equip means of verification, and to adapt to the practices of the hydraulic industry in different regions of the world.

• The first type of calculation (« METHODE_STAB = » SRM « « ) is performed by reduction

  progressive shear strength parameters ( »strength reduction method ») in English, called SRM) until the discrepancy of the finite element calculation. This discrepancy reflects the moment of rupture of the global structure. By defining a zone SRM, it is possible to indicate directly the slope to be analyzed, if there are several in the model.

• The second type of calculation (« METHODE_STAB = » LEM « « ) is based on balance theory

  limit (LEM). The safety factor is calculated by resolving the balance of forces and moments of the ground slices considered to be rigid solids. The macro has optimization algorithms to locate the fracture surface. 4 LEM methods are available:

  • « «  » FELLENIUS «  » and « «  » BISHOP «  » simplified for circular break surfaces.

  • «  » SPENCER «  » and « «  » MORGENSTERN - PRICE «  » ``for non-circular fracture surfaces.

The macro command CALC_STAB_PENTE outputs a table containing the safety factors (FS) tested and information about the geometry of the fracture surface. If requested, In addition, the macro command generates an evol_noli concept for visualizing the fracture surface.