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.

Characteristics of modeling
-----------------------------------

.. figure:: images/Object_19.svg
 :align: center
 :width: 480
 :height: 360
 
 3D modeling.


.. _RefImage_Object_19.svg:


.. list-table:: Caractéristiques du maillage.
  
 * - Number of knots
   - 20
 * - Number of meshes
   - | 1 type HEXA 20
     | 6 of the QUAD 8 type

.. list-table:: Mailles définies.
  
 *-* DROITE *
   - NO3, NO5, NO8, N10, N10, NO12,, NO15, NO17, NO20
 *-* GAUCHE *
   - NO1, NO4, NO6, NO9, NO11,,, NO13, NO16, NO18
 *-* DEVANT *
   - NO6, NO7, NO8, NO11, NO12,,, NO18, NO19, NO20
 *-* DERRIERE *
   - NO1, NO2, NO3, NO9, NO10,,, NO13, NO14, NO15
 *-* BAS *
   - NO13, NO14, NO15, NO16, NO17,,, NO18, NO19, NO20
 *-* HAUT *
   - NO1, NO2, NO3, NO4, NO5,,, NO6, NO7, NO8


To represent 1/8th of the structure, the boundary conditions when moving are:

*On the face* BAS *: :math:`DZ=0`.

*On the face* GAUCHE *: :math:`DY=0`.

*On the face* DERRIERE *: :math:`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 (:math:`PRE1=0`). 
Then, the distributed pressure is kept constant on the lateral faces *DROITE* and *DEVANT*, a displacement :math:`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.

Tested sizes and results
------------------------------

The components :math:`\sigma'_{xx}`, :math:`\sigma'_{yy}`, and :math:`\sigma'_{zz}` of the stress tensor 
effective are tested at moments :math:`3, 6, 15` and :math:`20`, 
and the water pressure value :math:`PRE1` at time :math:`20` `at node NO8. 
The reference values are non-regression values.

.. list-table:: Valeurs de :math:`\sigma'_{xx}=\sigma'_{yy}`.
  
 *-**Phase**
   - **Moment**
   - **Reference**
   - **Aster code**
 * - 1st load
   - :math:`3`
   - No regression
   - :math:`-3.000000\times10^5` Not
 * - 1st load
   - :math:`6`
   - No regression
   - :math:`-6.000000\times10^5` Not
 * - 2nd load
   - :math:`15`
   - No regression
   - :math:`-2.42065\times10^5` Not
 * - 2nd load
   - :math:`20`
   - No regression
   - :math:`-2.413841\times10^5` Not

.. list-table:: Valeurs de :math:`\sigma'_{zz}`.
  
 *-**Phase**
   - **Moment**
   - **Reference**
   - **Aster code**
 * - 1st load
   - :math:`3`
   - No regression
   - :math:`-3.000000\times10^5` Not
 * - 1st load
   - :math:`6`
   - No regression
   - :math:`-6.000000\times10^5` Not
 * - 2nd load
   - :math:`15`
   - No regression
   - :math:`-5.520378\times10^5` Not
 * - 2nd load
   - :math:`20`
   - No regression
   - :math:`-5.514999\times10^5` Not

.. list-table:: Valeurs de :math:`PRE1`.
  
 *-**Phase**
   - **Moment**
   - **Reference**
   - **Aster code**
 * - 2nd load
   - :math:`20`
   - No regression
   - :math:`3.586158\times10^5` Not