×
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

Driven pile set criteria - different expressions

Driven pile set criteria - different expressions

Driven pile set criteria - different expressions

(OP)
I noted that people would use different expressions for set criteria of driven piles. For example, 4 mm/blow or 40 mm/10 blows. Can I say they are the same? Thanks.  

RE: Driven pile set criteria - different expressions

You have to establish you acceptance criteria. You could establish as many as you want as long as they mean "the same" with respect to acceptance.

You can say, 40 blows max or 12 blows/ft or any other criteria  that you decide would work for your piles/soil.  

RE: Driven pile set criteria - different expressions

The best way to answer the question "Can I say they are the same?" is "Not really."

Let me explain it in US units, as I'm more familiar with the problem there.

Let's assume that we have a refusal criterion of 120 blows/ft.  In theory we could also say 10 blows/inch; however, if we're driving to a dense/hard layer, the decrease in set may take place within the span of the foot.  So the set could decrease substantially from the point where the pile toe entered the foot in question to where it left (or driving stopped.)  Different sets imply different pile ultimate capacities, so whether you're using an inch, foot, 25 mm or 300 mm could make a difference.

How much of a difference it makes will depend on how much the soil profile varies.  That's a job specific decision, but it's one that needs to be adhered to consistently once it's determined.

http://www.pz27.net

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