×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

soils "Calculation of phreatic surface in an earth dam"

soils "Calculation of phreatic surface in an earth dam"

soils "Calculation of phreatic surface in an earth dam"

(OP)
Dear members,

I am trying to understand how soil consolidation analysis works using the example entitled "Calculation of phreatic surface in an earth dam" in the ABAQUS Examples Manual (specifically, phreaticsurf_cpe8rp.inp). I noticed a few statements in the example that I did not quite follow:

  1. Quote (ABAQUS Abaqus Example Problems Manual 10.1.2 (v.6.11-1pr3))

    Since the natural boundary condition in the pore fluid flow formulation provides no flow of fluid across a surface of the model, no further specification is needed on this surface.

    Do I simply leave a surface alone if it is impermeable? Don't I need to assign a zero pore pressure or zero permeability and void ratio boundary condition?

  2. Quote (ABAQUS Abaqus Example Problems Manual 10.1.2 (v.6.11-1pr3))

    the default assumption is used for the partially saturated permeability: that it varies as a cubic function of saturation, decreasing from the fully saturated value to a value of zero at zero saturation.

    Where is this set? I do not see any values in the "Saturation Dependence" (which is where I assumed this variability would be defined) table.

  3. Quote (ABAQUS Abaqus Example Problems Manual 10.1.2 (v.6.11-1pr3))

    The initial void ratio of the earth material is 1.0


  4. I see the initial void ratio = 1.0 defined in the *Initial Conditions, Type=Ratio line of the INP. But then, what does the "Void Ratio" option in the Permeability (material behavior) stand for?
These questions reflect the fact that I have barely begun to understand "soil consolidation" theory and modeling both. I'd appreciate any help.

Thanks.

http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources