2. Modeling A#
It should be noted that modeling A is characterized by:
A hydrostatic compression path under drained condition up to consolidation pressure.
An undrained path by maintaining lateral stresses on the sample and by imposing a vertical displacement compression which induces a state of triaxial stresses, and a contracting plastic regime.
2.1. Characteristics of modeling#
Fig. 2.1 3D modeling.#
Number of knots |
20 |
Number of meshes |
1 type HEXA 20
6 of the QUAD 8 type
|
To represent 1/8th of the structure, the boundary conditions when moving are:
On the face BAS *: \(DZ=0\).
On the face GAUCHE *: \(DY=0\).
On the face DERRIERE *: \(DX=0\).
The load consists of the same pressure distributed in compression over the 3 meshes: HAUT, DROITE, and * and DEVANT * to simulate a hydrostatic test, and zero water pressure to simulate the drainage condition (\(PRE1=0\)). Then, the distributed pressure is kept constant on the lateral faces DROITE and DEVANT, a displacement \(DZ\) is imposed on the HAUT face that varies over time, and the hydraulic load (zero flow) is changed to simulate the non-drained condition.
2.2. Tested sizes and results#
The components \(\sigma'_{xx}\), \(\sigma'_{yy}\), and \(\sigma'_{zz}\) of the stress tensor effective are tested at moments \(3, 6, 15\) and \(20\), and the water pressure value \(PRE1\) at time \(20\) `at node NO8. The reference values are non-regression values.