4. B modeling#
4.1. Characteristics of modeling#
2D modeling in plane deformations. This modeling corresponds to methodology 2 of the U2.04.06 documentation: excavation with support with stress initialization by calling CREA_CHAMP and deconfinement using a single model and a « flexible » material for the excavated area.
The mesh is the same as for modeling A.
4.2. Calculation process#
The objective of this test case is to test a method. The following table shows the main steps that structure the command file.
Orders |
Reviews |
CREA_CHAMP |
Initialization of geostatic constraints (here isotropic \(5\mathrm{MPa}\) in compression) |
STAT_NON_LINE |
Blocking the nodes in the gallery to calculate the nodal reactions to be injected to simulate deconfinement |
CREA_CHAMP |
Recovery of nodal reactions |
STAT_NON_LINE |
Reinjecting nodal reactions |
STAT_NON_LINE |
Progressive deconfinement of the Massif |
4.3. Tested sizes and results#
After the installation of the coating (final moment), the components \({\sigma }_{\mathrm{xx}}\) and \({\sigma }_{\mathit{yy}}\) are tested at the nodes \(\mathrm{N2}\) and \(\mathrm{N6}\) as well as the radial displacement at these points (\(\mathrm{DX}\) for \(\mathrm{N2}\), \(\mathrm{DY}\) for \(\mathit{N6}\)).
Reference |
Aster |
Difference (%) |
|
Knot \(\mathrm{N2}\) |
|||
|
-1,52821.106 |
-1,53619.106 |
0.52 |
|
-8,47179,106 |
-8.53167.106 |
0.71 |
\(\mathrm{DX}\) |
-1,6925.10-3 |
-1,6687.10-3 |
-1.41 |
Knot \(\mathrm{N6}\) |
|||
|
-8,47179,106 |
-8,41158.106 |
-0.71 |
|
-1,52821.106 |
-1,52967.106 |
0.1 |
\(\mathrm{DY}\) |
-1,6925.10-3 |
-1.7180.10-3 |
1.51 |