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!

*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.

Jobs

Calculation of porewater response - eurocode 7

Calculation of porewater response - eurocode 7

(OP)
Trying to get to grips with the new eurocode 7:

Think fill on soft clay.
In undrained stability analysis with effective stress parameters.
How do you calculate the porewater pressure response the right way according to eurocode 7 ?
How much conservatism is normal and right to applie in the choice of  characteristic parameter(s), like Skempton B-parameter ?

RE: Calculation of porewater response - eurocode 7

hwg,
your question is not very clear to me.

Do you mean getting undrained parameters (Su) from a drained TX test with pore pressure measures?

If so, I'm not sure using characteristic values for Skempton parameters would be the right procedure.

What I'd do would be to determine Su first using an average values of all the parameters involved and then transform it to characteristic value Su_k.

RE: Calculation of porewater response - eurocode 7

Why do you need to change from pre-EC technique? My opinion is to use the same amount of conservatism...

RE: Calculation of porewater response - eurocode 7

@Mccoy: He doesn't want to work with su. Intead he wants to work with c', φ' and the anticipated pore water pressure build up...

RE: Calculation of porewater response - eurocode 7

Quote (yannis):

Why do you need to change from pre-EC technique? My opinion is to use the same amount of conservatism...

Actually, eurocode 7 requires that geotechnical parameters are used as conservative estimates of the value which governs the occurrence of the limit state. That's a must.
You may end up with the same amount of conservatism though, if some conditions are fulfilled.

Quote (yannis):

@Mccoy: He doesn't want to work with su. Intead he wants to work with c', φ' and the anticipated pore water pressure build up...

OK, I missed that, I would say that if pore pressure is used to compute phi-c, then a conservative estimate of phi and c should be used as characteristic values leaving unchanged the value of the skempton parameters.
Usually the geotechnical parameters directly used in the limit states formulas are transformed into characteristic, then design values.

I'll check this though, wether there is some specific example available from the few authoritative references

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


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