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!

*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

Piedmont Residual Soil - Anisotropy

Piedmont Residual Soil - Anisotropy

Piedmont Residual Soil - Anisotropy

What would be an appropriate field and/or laboratory test method for determining the permeability/anisotropy of piedmont residual soil;
specifically, the partially weathered zone just above interface with competent rock?

RE: Piedmont Residual Soil - Anisotropy

what's the end game?

Anisotropy as it relates to slope stability?
Anisotropy as it relates to time for consolidation?
Anisotropy as it relates to pore pressure dissipation?
Anisotropy as it relates to a flow net in dam design?
Anisotropy as it relates to contamination transport?

I work in the Piedmont of Virginia and have some experiences. I can't think of too many times we drilled into the details of anisotropy in the piedmont. Not that I don't get it, I just haven't thought in those terms in the Piedmont.

Willing to address the topic; however. Just not sure where you are headed?


ípapß gordo ainÆt no madre flaca!

RE: Piedmont Residual Soil - Anisotropy

Anisotropy of piping layer (kh/kv). How can this best be determined?

RE: Piedmont Residual Soil - Anisotropy

So, this is for the benefit of a numerical model?

in addressing piping you clearly need to assess the critical gradient, the head drop in the last cell or two and make the comparison against some safety factor. If the soil is truly anisotropic, you can use a numerical model or you can transform the flow net.

If this is all too complicated, you can also simplify the problem statement, see the scale of the concern and still install a toe drain to allow the exit gradient to occur under confinement.

I will remain unclear on the end game. Is this a dam, retaining wall, shoring system, box culvert? Are there boring logs to make you think of an anisotropic setting? Are you striving to use anisotropy to simplify a layered system of soils, etc.

I enjoy these sort of problems!


ípapß gordo ainÆt no madre flaca!

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! Already a Member? Login


eBook - Functional Prototyping Using Metal 3D Printing
Functional prototypes are a key step in product development – they give engineers a chance to test new ideas and designs while also revealing how the product will stand up to real-world use. And when it comes to functional prototypes, 3D printing is rewriting the rules of what’s possible. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close