Code_Aster
®
Version
7.3
Titrate:
WTNV101 - Triaxial compression test not drained with the model of Laigle
Date:
13/10/04
Author (S):
R. FERNANDES, C. CHAVANT
Key
:
V7.31.101-A
Page:
1/6
Manual of Validation
V7.31 booklet: Mechanical hydro Thermo in porous environment of voluminal structures
HT-66/04/005/A
Organization (S):
EDF-R & D/AMA
Manual of Validation
V7.31 booklet: Mechanical hydro Thermo in porous environment of voluminal structures
Document: V7.31.101
WTNV101 - Triaxial compression test not drained with the model
of Laigle and with hydraulic coupling
Summary
This test makes it possible to validate the model of Laigle with hydraulic coupling. It is about a triaxial compression test in
not drained condition. The aspect not drained is modelized by a null voluminal deformation of the skeleton and it
hydraulic coupling is taken into account, the sample is completely saturated, the skeleton and the fluid being
presumedly incompressible.
By reason of symmetry, one is interested only in the eighth of a sample subjected to a triaxial compression test.
The level of containment is 8 MPa.
Code_Aster
®
Version
7.3
Titrate:
WTNV101 - Triaxial compression test not drained with the model of Laigle
Date:
13/10/04
Author (S):
R. FERNANDES, C. CHAVANT
Key
:
V7.31.101-A
Page:
2/6
Manual of Validation
V7.31 booklet: Mechanical hydro Thermo in porous environment of voluminal structures
HT-66/04/005/A
1
Problem of reference
1.1 Geometry
Z
X
y
E
L
H
C
With
B
height:
H = 1 m
width:
L = 1 m
thickness: E = 1 m
Co-ordinates of the points (in meters):
With
B
C
D
X 0. 0.
0.5 1.
y 0. 1.
0.5 1.
Z 0. 0.
0.5
0.
1.2
Material property
E = 1500 10
3
kPa
= 0,27
;
10
05
.
23
;
10
09
.
9
;
7
.
0
;
25
.
0
;
45
.
0
;
5
.
0
;
0
.
15
;
65
.
0
;
0
.
7
;
0
.
2
;
005
.
0
;
132
.
0
6
2
6
1
AP
AP
has
m
has
m
m
p
p
cjs
peak
peak
E
E
ult
E
ult
=
=
=
=
=
=
=
=
=
=
=
=
Code_Aster
®
Version
7.3
Titrate:
WTNV101 - Triaxial compression test not drained with the model of Laigle
Date:
13/10/04
Author (S):
R. FERNANDES, C. CHAVANT
Key
:
V7.31.101-A
Page:
3/6
Manual of Validation
V7.31 booklet: Mechanical hydro Thermo in porous environment of voluminal structures
HT-66/04/005/A
1.3
Initial conditions, boundary conditions, and loading
1.3.1 Modeling coupled with hydraulics
Phase 1:
One brings the sample in a homogeneous state of effective stresses:
xx
yy
zz
0
0
0
=
=
, while imposing
corresponding total pressure on the front, side straight line and higher faces and while imposing
everywhere null water pressures. Displacements are locked on the faces postpones (
U
X
= 0
),
side left (
U
y
= 0
) and lower (
U
Z
= 0
).
Phase 2:
One maintains displacements locked on the faces postpones (
U
X
= 0
), side left (
U
y
= 0
) and
lower (
U
Z
= 0
). On all the faces, hydraulic flows are null.
One applies a displacement forced to the higher face in order to obtain a deformation
zz
= - 20%
(counted starting from the beginning of phase 2). On the front faces and side straight line, one
impose boundary conditions in total stress:
)
8
(
.
0
MPa
N
=
=
Code_Aster
®
Version
7.3
Titrate:
WTNV101 - Triaxial compression test not drained with the model of Laigle
Date:
13/10/04
Author (S):
R. FERNANDES, C. CHAVANT
Key
:
V7.31.101-A
Page:
4/6
Manual of Validation
V7.31 booklet: Mechanical hydro Thermo in porous environment of voluminal structures
HT-66/04/005/A
2 Modeling
With
2.1
Characteristics of modeling
3D:
Z
X
y
B
Cutting: 1 in height, in width and thickness.
Loading of phase 1:
Confining pressure:
xx
yy
zz
0
0
0
=
=
: 8 MPa.
Coefficient of biot: 1
UN_SUR_K of water: 0
Modeling: 3d_HM
2.2
Characteristic of the mesh
A number of nodes: 20
A number of meshs and types: 1
HEXA20
and 6
QUA8
2.3 Functionalities
tested
Controls
DEFI_MATERIAU LAIGLE
STAT_NON_LINE COMP_INCR RELATION “KIT_HM”
“RELATION_KIT”:
“LAIGLE”, “LIQU_SATU”, “HYDR_UTIL”
Code_Aster
®
Version
7.3
Titrate:
WTNV101 - Triaxial compression test not drained with the model of Laigle
Date:
13/10/04
Author (S):
R. FERNANDES, C. CHAVANT
Key
:
V7.31.101-A
Page:
5/6
Manual of Validation
V7.31 booklet: Mechanical hydro Thermo in porous environment of voluminal structures
HT-66/04/005/A
3
Results of modeling A
3.1 Values
tested
Localization
Sequence number
Stress (MPa)
Aster
Not D
1
xx
6.91788E+06
2
xx
5.44150E+06
3
xx
3.96513E+06
4
xx
2.64978E+06
8
xx
- 8.68544E+06
23
xx
1.22666E+07
1
yy
6.91788E+06
2
yy
5.44150E+06
3
yy
3.96513E+06
4
yy
2.64978E+06
8
yy
8.68544E+06
23
yy
1.22666E+07
1
zz
1.01642E+07
2
zz
1.31170E+07
3
zz
1.60697E+07
4
zz
1.87406E+07
8
zz
3.21306E+07
23
zz
3.68000E+07
1
pressure
water
1.08211E+06
2
pressure
water
2.55849E+06
4
Summary of the results
This case test is a test of nonregression developed to validate the model of Laigle with coupling
hydraulics.
Code_Aster
®
Version
7.3
Titrate:
WTNV101 - Triaxial compression test not drained with the model of Laigle
Date:
13/10/04
Author (S):
R. FERNANDES, C. CHAVANT
Key
:
V7.31.101-A
Page:
6/6
Manual of Validation
V7.31 booklet: Mechanical hydro Thermo in porous environment of voluminal structures
HT-66/04/005/A
Intentionally white left page.