CFVR3217 - Slope stability with non horizontal reinforced earth

Slope stability analysis, without water pressure and with reinforced earth.

A plane model as shown in the figure is used to check reinforced earth in Janbu method is used.
The model is made off a single material with a dry specific weight of 20000 N/m², 28º internal friction angle and no cohesion.
The terrain is considered dry. No water table is defined.
The only action on the structure is its self weight and the reinforcement bars which are defined as a group of two bars with 0.3 as the apparent friction coefficient, with a 30º slope downwards. The bars are assumed to have no strength limit.

Element types used in the model: PLANE42

Needed CivilFEM Modules:
Geotechnical Module
Bridges and Civil Non Linearities Module
Advanced Prestressed Concrete Module

The example can be launched on an educational license.

KEYWORDS

Geotechnics

Slope Stability

Model Statistics
Number of elements	119
Number of nodes	145
Number of civil materials	1
Number of cross sections	0
Number of shell vertices	0

Log file: CFVR3217.DAT

! DESCRIPTION  slope stability analysis.
  FINISH
  ~CFCLEAR,,1
  ~CFACTIV,GETC,Y
  NomFile='CFVR3217'
  /TITLE, %NomFile%, Slope stability with non horizontal reinforced earth

! -------------------------------------------------------------------------------------
! 1. Initial data
! -------------------------------------------------------------------------------------
! CivilFEM SETUP
  ~UNITS,SI

/PREP7
! 2. Materials
! --------------------------------------------------
~CFMP,1,LIB,SOIL,,OH
~CFMP,1,SOIL,GAMD,,20000
~CFMP,1,SOIL,PHIMCEFF,,28
~CFMP,1,SOIL,CMCEFF  ,,0

! 3. Elements
! --------------------------------------------------
ET,1,PLANE42

! 4. MODEL
! --------------------------------------------------
K, 1,  0, 0
K, 2, 25, 0
K, 3, 25,13
K, 4, 16,13
K, 5,  8, 5
K, 6,  0, 5
A,1,2,3,4,5,6
AESIZE,ALL,1.5
MAT,1
AMESH,1
EPLOT
/IMAGE, SAVE, %NomFile%,BMP

! 5. Capturing Model
! --------------------------------------------------
~SLPINK,6,3,5

! 6. Sliding Surface
! --------------------------------------------------
~SLPPOL,11,8
~SLPPOL,21,13

! 7. Reinforcement
! --------------------------------------------------
~REDEF,1,13.5,8.0,13.501,8.0,2,0.30,0,0,-30

! 8. Solve
! --------------------------------------------------
/POST1
~SLPOPT,0.01,20,2,10, ,1
~SLPSOL,2,1,0.0,0.0 ! Janbu

! 9. Data Check
! --------------------------------------------------
! Data comparison number
  NComp    = 1
  NComp_ch = 0

! Marix dim.
  *DIM,LABEL,CHAR,Ncomp,1
  *DIM,LABEL_CH,CHAR,Ncomp_ch,1
  *DIM,VALUE,,Ncomp,3
  *DIM,VALUE_CH,CHAR,Ncomp_ch,3
  *DIM,TOLER,,Ncomp,2

! 10. Labels, Correct data, obtained data
! --------------------------------------------------
  LABEL(1) = 'F'
  ~CFGET,VALUE(  1,2),SLOPE,,RES,F,,1,1
  VALUE(  1,1) =  1.16
! Warning and error tolerances
  TOLER(  1,1) = 0.01  $  TOLER(  1,2) = 0.01

! 11. Results comparison
! --------------------------------------------------
  COMPARA.MAC

Results

Label	Target	CivilFEM	Ratio	Tolerance
F	1.16	1.1541	1.005	0.01

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CFVR3217 - Slope stability with non horizontal reinforced earth

Slope stability analysis, without water pressure and with reinforced earth.

Results