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laws:solnl1
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SOLNL1
Description
Constitutive law of flow and deformation in porous media for a pipe element
The model
Elasto-plastic nonlinear analysis of coupled seepage and compaction in porous media. This law is used for one-dimensional problems
Files
Prepro: LSONL1.F
Lagamine: SOLNL1.F
Availability
| Plane stress state | YES |
| Plane strain state | YES |
| Axisymmetric state | NO |
| 3D state | NO |
| Generalized plane state | NO |
Input file
Parameters defining the type of constitutive law
| Line 1 (2I5, 60A1) | |
|---|---|
| IL | Law number |
| ITYPE | 260 |
| COMMENT | Any comment (up to 60 characters) that will be reproduced on the output listing. |
Integer parameters
| Line 1 (I5) | |
|---|---|
| KPERM | 0 $\rightarrow$ loi NISHIDA (K=exp($\alpha e + \beta$)) 1 $\rightarrow$ loi TERZAGMI (K = $\alpha (e-\beta )^{\delta} \cdot (1+e$)) |
Real parameters
| Line 1 (9G10.0) | |
|---|---|
| A | elasticity logarithm modulus |
| C | elastoplasticity logarithm modulus |
| GAMA | = $\gamma$ fluid specific weight |
| $\alpha$ | 1st flow parameter |
| $\beta$ | 2nd flow parameter |
| $\delta$ | 3rd flow parameter |
| $\Omega$ | section |
| $e_0$ | initial void ratio |
| $\sigma_{p’}$ | initial preconsolidation stress |
Note: Y axis is vertical directed from bottom to top. Gravity same direction, other sense.
Stresses
Number of stresses
4
Meaning
| SIG(1) | axial effective stress |
| SIG(2) | fluid flow in the pipe |
| SIG(3) | fluid flow accumulated as a consequence of the evolution of soil porosity = strain rate |
| SIG(4) | axial total stress |
State variables
Number of state variables
4
List of state variables
| QA(1) | A cross-section |
| QA(2) | e void ratio = $v_v/v_m$ |
| QA(3) | $\sigma_{p’r}$ yield stress preconsolidation stress |
| QB(4) | yield yield indicator |
laws/solnl1.txt · Last modified: 2020/08/25 15:46 (external edit)
