How to model the settlement in soil due to water drawdown. - SoilModels

Guru Panda|5.4.2019|Finite Elements|5 |

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Which software has the feature to model soil settlement due water drawdown?

5 Comments

Arie Koot 7 years ago

Abaqus with user subroutine: for example use C3D8T element: With this Temperature element water flow can be modeled

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- MohamadReza Kamali 2 years ago
  
  Hi Arie,
  I see several times you suggested using temperature instead of water flow, but I wonder how you did it. is it possible to describe a little about the procedure or provide an example file?
  Regards
  
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  - Arie Koot 2 years ago
    
    I only have it for Vumat:
    
    Wateflow using temperature.
    
    type of calc: dynamic temperature-displacement explicit
    element type: C3D8RT
    output: temp and NT11 (element + nodal)
    QT=(T1-T2)*A*ktemp/L*dt [J]
    ΔT=Q/VRCtemp
    stable time < VRCtemp/∑A*ktemp/L
    example:
    mesh 0.1×0.1×0.1
    λ=200
    R=2800
    C=880
    stable time < 0.1×0.1×0.1x2800x880/(4*0.1×0.1×200)/0.1)=31sec
    general: stable time temp much higher than mechanical stable time
    
    Qw= ΔhxAxkw/L*dt = (P1-P2)/9810xAxkw/L*dt [m3]
    kw=m/s
    ΔP=Qw/VxEwbulk
    stable time < V/Ewbulk/∑A*kw/9810/L
    
    thus ktemp=conductility=Kw/9810
    thus Ctemp=specified heat= 1/Ewbulk/R
    
    in vumat: Enerpl(new)=Enerpl(old)+plasticenergy/R
    for waterflow: Enerpl(new)=Enerpl(old)+(pwnew-pwold)/Ewbulk/R
HAFSSA TOUNSI 7 years ago

COMSOL. This tutorial could be of great help :
https://www.comsol.fr/model/biot-poroelasticity-483

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David Mašín 7 years ago

This can be done by most of the software here. For Plaxis, see this tutorial: https://www.plaxis.com/support/tutorials/plaxis-3d-tutorial-rapid-drawdown-analysis/

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