Modeling A
==============


But
---

The aim of this test is to validate the use of the macro command POST_LIQUEFACTION. An extremely simple field was created on a 2D dam in order to validate the calculation of the macro-command. Note that for this non-physical test, the orders of magnitude of the criteria do not correspond to the values currently obtained on a dam.


Description
-----------

The hydromechanical modeling is assigned to a 2D mesh: MODELISATION = 'D_ PLAN_HM_SI '. The constraint field SIEF_ELGA is retrieved at the Gauss points, in the data structure 'EVOL_NOLI' read in the format MED.

The direction of gravity is :math:`y`. We choose a particular moment.

The values of the fictional fields are:


.. csv-table::

    "Component", "Value"
    ":math:`{p}_{h}` ", "18 Pa"
    ":math:`{p}_{h}^{\mathit{eff}}` ", "16 Pa"
    ":math:`{\mathrm{\sigma }}_{\mathit{xx}}^{\mathit{eff}}(t,\mathrm{x})` ", "1 Pa"
    ":math:`{\mathrm{\sigma }}_{\mathit{yy}}^{\mathit{eff}}(t,\mathrm{x})` ", "3 Pa"
    ":math:`{\mathrm{\sigma }}_{\mathit{zz}}^{\mathit{eff}}(t,\mathrm{x})` ", "2 Pa"


The values for the constraints effective at time :math:`t` and for the reference are the same.

In this case, the expected values (which are not physical) are:


.. csv-table::

    "Criteria", "Value"
    "DP_SIGV_REF ", "4"
    "DP_SIGM_REF ", "6"
    "DP", "12 Pa"
    "P_ SIGM ", "14"



Principle of validation
----------------------

Comparison of the calculation of the soil liquefaction detection criterion with Code_Aster.


Tested values
---------------

The value of the sum of the absolute values of the components of the difference field components of the SIPYY variables at a particular moment is tested at 0 with a value field corresponding to the expected values (paragraph 1.2).