Code_Aster. SSNV158 - Triaxial compression test drained with the model of Laigle

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1 Titre : SSNV158 - Essai triaxial drainé avec le modèle de [...] Date : 26/08/2013 Page : 1/13 SSNV158 - Triaxial compression test drained with the model of Laigle Summary This test makes it possible to validate the model of Laigle in rock mechanics (formalism CIH). It is about a triaxial compression test in drained condition. Calculations are carried out only on the solid part of the ground without hydraulic coupling. One applies four levels of containment ( 8 MPa 4 MPa 2 MPa 1 MPa ). By reason of symmetry, one is interested only in the eighth of a sample subjected to a triaxial compression test. Modeling is axisymmetric. It is about a test of nonregression.

2 Titre : SSNV158 - Essai triaxial drainé avec le modèle de [...] Date : 26/08/2013 Page : 2/13 1 Problem of reference 1.1 Geometry e z h A C B y height: width: thickness: h=1 m l=1 m e=1 m x l Coordinates of the points (in meters): A B C D x y z Material property E= kpa =0.27 m m a m a ult e e ult e pic pic cjs p1 p ; 0.005; 2.0; 7.0; 0.65; 15.0; 0.5; 0.45; 0.25; 0.7; Pa; Pa;

3 Titre : SSNV158 - Essai triaxial drainé avec le modèle de [...] Date : 26/08/2013 Page : 3/ Initial conditions, boundary conditions, and loading Phase 1: xx yy zz One brings the sample in a homogeneous state:, by imposing the corresponding confining pressure on the front, side right-hand side and higher faces. Displacements are blocked on the faces postpones ( u x =0 ), side left ( u y =0 ) and lower ( u z =0 ). Phase 2: One maintains displacements blocked on the faces postpones ( u x =0 ), side left ( u y =0 ) and lower ( u z =0 ), as well as the confining pressure on the front faces and side right-hand side. One applies a displacement imposed to the higher face: uz t, in order to obtain a deformation zz = 20% (counted starting from the beginning of phase 2).

4 Titre : SSNV158 - Essai triaxial drainé avec le modèle de [...] Date : 26/08/2013 Page : 4/13 2 Reference solution 2.1 Results of reference Constraints xx, yy and zz at the point D. Displacements xx, yy at the point D. References provided by software FLAC-2D: c o u r b e s Q - e p s 1 2 5, , 0 0 d é v i a t e u r ( M P a ) 1 5, , 0 0 F L A C 1 M P a F L A C 2 M P a F L A C 4 M P a F L A C 8 M P a H B - C J S 5, 0 0 0, 0 0 0, 0 0 2, 0 0 4, 0 0 6, 0 0 8, , , , , , , 0 0 e p s 1

5 Titre : SSNV158 - Essai triaxial drainé avec le modèle de [...] Date : 26/08/2013 Page : 5/13 e p s 1 - e p s v 2, 0 0 1, 5 0 e p s v 1, 0 0 0, 5 0 0, 0 0 0, 0 0 5, , , , , M p a 2 M p a 4 M p a 8 M p a H B - C J S - 0, 5 0-1, 0 0 e p s 1

6 Titre : SSNV158 - Essai triaxial drainé avec le modèle de [...] Date : 26/08/2013 Page : 6/13 3 Modeling A 3.1 Characteristic of modeling 2D : y z x Cutting: 1 in height, 1 in width. Loading of phase 1: Confining pressure: 0 xx = 8 MPa 3.2 Characteristic of the grid Many nodes: 4 Many meshs and types: 1 QUAD4 and 4 SEG2 3.3 Sizes tested and results For 0 xx = 8 MPa Localization Sequence number Constraint Aster ( MPa ) Not D 5 xx 8, xx 8,000 5 zz 8, zz 8,000 5 yy yy yy yy yy yy

7 Titre : SSNV158 - Essai triaxial drainé avec le modèle de [...] Date : 26/08/2013 Page : 7/13 49 yy Localization Sequence number Deformation Aster * E-02 Not D 1 xx 0, xx xx 7,140 1 yy 1,200 5 yy 1, yy 2, yy 8, yy 19.04

8 Titre : SSNV158 - Essai triaxial drainé avec le modèle de [...] Date : 26/08/2013 Page : 8/13 4 Modeling B 4.1 Characteristic of modeling 2D : y z x Cutting: 1 in height, 1 in width. Loading of phase 1: Confining pressure: 0 xx = 4 MPa. 4.2 Characteristic of the grid Many nodes: 4 Many meshs and types: 1 QUAD4 and 4 SEG2 4.3 Sizes tested and results For 0 xx = 4 MPa Localization Sequence number Constraint Aster ( MPa ) Not D 5 xx 4, xx 4,000 5 zz 4, zz 4,000 5 yy yy yy yy yy

9 Titre : SSNV158 - Essai triaxial drainé avec le modèle de [...] Date : 26/08/2013 Page : 9/13 40 yy yy Localization Sequence number Deformation Aster * E-02 Not D 1 xx 0, xx 0, xx 7,195 1 yy 0,800 5 yy 1, yy 1, yy 7, yy 16,000

10 Titre : SSNV158 - Essai triaxial drainé avec le modèle de [...] Date : 26/08/2013 Page : 10/13 5 Modeling C 5.1 Characteristic of modeling 2D : y z x Cutting: 1 in height, 1 in width. Loading of phase 1: Confining pressure: 0 xx = 2 MPa 5.2 Characteristic of the grid Many nodes: 4 Many meshs and types: 1 QUAD4 and 4 SEG2 5.3 Sizes tested and results For 0 xx = 2 MPa Localization Sequence number Constraint Aster ( MPa ) Not D 5 xx 2,000 5 zz 2,000 5 yy yy yy yy yy yy yy

11 Titre : SSNV158 - Essai triaxial drainé avec le modèle de [...] Date : 26/08/2013 Page : 11/13 Localization Sequence number Deformation Aster * E-02 Not D 1 xx 0, xx 1, xx 8,048 1 yy 0,800 5 yy 1, yy 2, yy 12, yy 15,500

12 Titre : SSNV158 - Essai triaxial drainé avec le modèle de [...] Date : 26/08/2013 Page : 12/13 6 Modeling D 6.1 Characteristic of modeling 2D : y z x Cutting: 1 in height, 1 in width. Loading of phase 1: Confining pressure: 0 xx = 1 MPa 6.2 Characteristic of the grid Many nodes: 4 Many meshs and types: 1 QUAD4 and 4 SEG2 6.3 Sizes tested and results For 0 xx = 1 MPa Localization Sequence number Constraint Aster ( MPa ) Not D 296 xx 1, xx 1, zz 1, zz 1, yy yy yy yy yy

13 Titre : SSNV158 - Essai triaxial drainé avec le modèle de [...] Date : 26/08/2013 Page : 13/13 Localization Sequence number Deformation Aster * E-02 Not D 196 xx xx xx yy yy yy yy yy

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