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Strength reduction (#2817)

* input new files about slope stability

* input document of slope stability

* add something in Test file

* some changes in test file

* some changes in test file

* some changes in test and prj file

* some changes in input files

* [T/MCAS] Relax nonlinear solver tols. Formatting.

* [T] Reformatting file.

* Add somethings in input files

* some changes in slope files

* Cleanup. Set ctest to fail.

Co-authored-by: tengfei <dengtenfei2016@hotmail.com>
Co-authored-by: Dmitri Naumov <github@naumov.de>
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3 people committed Mar 9, 2020
1 parent 43c16ab commit e990ed4d7b08416847f3b1d17c49a36288a032af
@@ -102,6 +102,24 @@ AddTest(
../../ring_plane_strain_pcs_0_ts_1_t_1.000000.vtu ring_plane_strain_pcs_0_ts_1_t_1.000000.vtu displacement displacement 1e-16 0
../../ring_plane_strain_pcs_0_ts_1_t_1.000000.vtu ring_plane_strain_pcs_0_ts_1_t_1.000000.vtu sigma sigma 1e-15 0
)

AddTest(
NAME Mechanics_slope_stability_mfront
PATH Mechanics/MohrCoulombAbboSloan
EXECUTABLE ogs
EXECUTABLE_ARGS slope.prj
TESTER vtkdiff
REQUIREMENTS NOT OGS_USE_MPI
DIFF_DATA
GLOB slope_pcs_0_ts_*.vtu displacement displacement 1e-14 0.0
GLOB slope_pcs_0_ts_*.vtu sigma sigma 1e-8 0.0
GLOB slope_pcs_0_ts_*.vtu epsilon epsilon 1e-14 0.0
GLOB slope_pcs_0_ts_*.vtu NodalForces NodalForces 1e-8 0.0
GLOB slope_pcs_0_ts_*.vtu EquivalentPlasticStrain EquivalentPlasticStrain 1e-13 0.0
GLOB slope_pcs_0_ts_*.vtu ElasticStrain ElasticStrain 1e-14 0.0
)
set_tests_properties(ogs-Mechanics_slope_stability_mfront PROPERTIES WILL_FAIL true)

endif()

AddTest(
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@@ -0,0 +1,255 @@
<?xml version="1.0" encoding="ISO-8859-1"?>
<OpenGeoSysProject>
<mesh>slope.vtu</mesh>
<geometry>slope.gml</geometry>
<processes>
<process>
<name>SD</name>
<type>SMALL_DEFORMATION</type>
<integration_order>2</integration_order>
<constitutive_relation>
<type>MFront</type>
<behaviour>MohrCoulombAbboSloan</behaviour>
<material_properties>
<material_property name="YoungModulus" parameter="YoungModulus"/>
<material_property name="PoissonRatio" parameter="PoissonRatio"/>
<material_property name="Cohesion" parameter="Cohesion"/>
<material_property name="FrictionAngle" parameter="FrictionAngle"/>
<material_property name="DilatancyAngle" parameter="DilatancyAngle"/>
<material_property name="TransitionAngle" parameter="TransitionAngle"/>
<material_property name="TensionCutOffParameter" parameter="TensionCutOffParameter"/>
</material_properties>
</constitutive_relation>
<solid_density>rho_sr</solid_density>
<specific_body_force>0 -9.8</specific_body_force>
<reference_temperature>293.15</reference_temperature>
<process_variables>
<process_variable>displacement</process_variable>
</process_variables>
<secondary_variables>
<secondary_variable internal_name="ElasticStrain" output_name="ElasticStrain"/>
<secondary_variable internal_name="EquivalentPlasticStrain" output_name="EquivalentPlasticStrain"/>
<secondary_variable internal_name="sigma" output_name="sigma"/>
<secondary_variable internal_name="epsilon" output_name="epsilon"/>
</secondary_variables>
</process>
</processes>
<time_loop>
<processes>
<process ref="SD">
<nonlinear_solver>basic_newton</nonlinear_solver>
<convergence_criterion>
<type>DeltaX</type>
<norm_type>NORM2</norm_type>
<reltol>1e-14</reltol>
</convergence_criterion>
<time_discretization>
<type>BackwardEuler</type>
</time_discretization>
<time_stepping>
<type>IterationNumberBasedTimeStepping</type>
<t_initial>0.0</t_initial>
<t_end>6</t_end>
<initial_dt>0.1</initial_dt>
<minimum_dt>1e-4</minimum_dt>
<maximum_dt>0.5</maximum_dt>
<number_iterations>1 5 10 20 </number_iterations>
<multiplier> 1.2 1.0 0.9 0.5</multiplier>
</time_stepping>
</process>
</processes>
<output>
<type>VTK</type>
<prefix>slope</prefix>
<timesteps>
<pair>
<repeat>10000</repeat>
<each_steps>1</each_steps>
</pair>
</timesteps>
<variables>
<variable>displacement</variable>
<variable>sigma</variable>
<variable>epsilon</variable>
<variable>ElasticStrain</variable>
<variable>EquivalentPlasticStrain</variable>
</variables>
</output>
</time_loop>
<parameters>
<parameter>
<name>YoungModulus</name>
<type>Constant</type>
<value>26e5</value>
</parameter>
<parameter>
<name>PoissonRatio</name>
<type>Constant</type>
<value>.3</value>
</parameter>
<parameter>
<name>Cohesion</name>
<type>CurveScaled</type>
<curve>cohesion_ramp</curve>
<parameter>cohesion_rs0</parameter>
</parameter>
<parameter>
<name>cohesion_rs0</name>
<type>Constant</type>
<value>5000</value>
</parameter>
<parameter>
<name>FrictionAngle</name>
<type>CurveScaled</type>
<curve>FrictionAngle_ramp</curve>
<parameter>FrictionAngle_rs0</parameter>
</parameter>
<parameter>
<name>FrictionAngle_rs0</name>
<type>Constant</type>
<value>20</value>
</parameter>
<parameter>
<name>DilatancyAngle</name>
<type>Constant</type>
<value>13</value>
</parameter>
<parameter>
<name>TransitionAngle</name>
<type>Constant</type>
<value>27</value>
</parameter>
<parameter>
<name>TensionCutOffParameter</name>
<type>CurveScaled</type>
<curve>TensionCutOffParameter_ramp</curve>
<parameter>TensionCutOffParameter_rs0</parameter>
</parameter>
<parameter>
<name>TensionCutOffParameter_rs0</name>
<type>Constant</type>
<value>13700</value>
</parameter>
<parameter>
<name>rho_sr</name>
<type>CurveScaled</type>
<curve>density_ramp</curve>
<parameter>rho_sr0</parameter>
</parameter>
<parameter>
<name>rho_sr0</name>
<type>Constant</type>
<value>1600</value>
</parameter>
<parameter>
<name>displacement0</name>
<type>Constant</type>
<values>0 0</values>
</parameter>
<parameter>
<name>dirichlet0</name>
<type>Constant</type>
<value>0</value>
</parameter>
<parameter>
<name>top_load</name>
<type>CurveScaled</type>
<curve>top_load_ramp</curve>
<parameter>top_load0</parameter>
</parameter>
<parameter>
<name>top_load0</name>
<type>Constant</type>
<value>-30000</value>
</parameter>
</parameters>
<curves>
<curve>
<name>cohesion_ramp</name>
<coords>0 1 2 3 4 5 6 7</coords>
<values>1 1 1 1 0.9 0.8 0.7 0.6</values>
</curve>
<curve>
<name>FrictionAngle_ramp</name>
<coords>0 1 2 3 4 5 6 7</coords>
<values>1 1 1 1 0.906 0.812 0.763 0.616</values>
</curve>
<curve>
<name>TensionCutOffParameter_ramp</name>
<coords>0 1 2 3 4 5 6 7</coords>
<values>1 1 1 1 1 1 1 1</values>
</curve>
<curve>
<name>density_ramp</name>
<coords>0 1</coords>
<values>0 1</values>
</curve>
<curve>
<name>top_load_ramp</name>
<coords>0 1 2</coords>
<values>0 0.5 1</values>
</curve>
</curves>
<process_variables>
<process_variable>
<name>displacement</name>
<components>2</components>
<order>1</order>
<initial_condition>displacement0</initial_condition>
<boundary_conditions>
<boundary_condition>
<geometrical_set>slope_geometry</geometrical_set>
<geometry>bottom</geometry>
<type>Dirichlet</type>
<component>0</component>
<parameter>dirichlet0</parameter>
</boundary_condition>
<boundary_condition>
<geometrical_set>slope_geometry</geometrical_set>
<geometry>bottom</geometry>
<type>Dirichlet</type>
<component>1</component>
<parameter>dirichlet0</parameter>
</boundary_condition>
<boundary_condition>
<geometrical_set>slope_geometry</geometrical_set>
<geometry>right</geometry>
<type>Dirichlet</type>
<component>0</component>
<parameter>dirichlet0</parameter>
</boundary_condition>
<boundary_condition>
<geometrical_set>slope_geometry</geometrical_set>
<geometry>left</geometry>
<type>Dirichlet</type>
<component>0</component>
<parameter>dirichlet0</parameter>
</boundary_condition>
<boundary_condition>
<geometrical_set>slope_geometry</geometrical_set>
<geometry>top</geometry>
<type>Neumann</type>
<component>1</component>
<parameter>top_load</parameter>
</boundary_condition>
</boundary_conditions>
</process_variable>
</process_variables>
<nonlinear_solvers>
<nonlinear_solver>
<name>basic_newton</name>
<type>Newton</type>
<max_iter>50</max_iter>
<linear_solver>general_linear_solver</linear_solver>
</nonlinear_solver>
</nonlinear_solvers>
<linear_solvers>
<linear_solver>
<name>general_linear_solver</name>
<eigen>
<solver_type>SparseLU</solver_type>
<scaling>true</scaling>
</eigen>
</linear_solver>
</linear_solvers>
</OpenGeoSysProject>
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@@ -0,0 +1,21 @@
+++
author = "Tengfei Deng, Thomas Nagel"
weight = 113
project = "Mechanics/MohrCoulombAbboSloan/slope.prj"
date = "2020-02-14T14:39:39+01:00"
title = "Strength reduction for slope stability"

[menu]

[menu.benchmarks]
parent = "small-deformations"

+++

{{< data-link >}}

## Problem description

We perform a strength reduction to determine the factor of safety of a slope.
See [this PDF](../slope_stability.pdf) for detailed problem description.

Binary file not shown.

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