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

Failed Driven Pile

Failed Driven Pile

Failed Driven Pile

I have a group of 4 piles driven for a square pile cap. One of the piles failed as proven by a PDA test( Pile Driving Analysis) conducted on that particular pile.

How should I rectify the problem? Should I drive two extra piles and redesign the pile cap?Could  anyone suggest any textbooks that address this kind of problem.

RE: Failed Driven Pile

Since only one of the 4 piles failed, it would be necessary to determine the probable cause of the failure.  Which was it in the driving sequence?  If last, I would worry about the others as well.  Perhaps you punched a lense and weakened the group.  Have you considered a load test of the whole cap?

As for you other questions, this is a "real" situation that usually doesn't appear in textbooks, though some of the older ones might contain it (Winterkorn and Fang, Terzhagi and Peck, Sowers, etc.).  If you don't want to go through additional testing, then re-design the cap with a one or more additional piles to accommodate the deficiency.  

I still think you should find the cause of failure first, though.

RE: Failed Driven Pile


In addition to Ron's suggestions, have a very close look at the pile driving records for all four piles to see if the 'failed' pile behaved differently during driving.

'Failed' means different things to different people.  To the pile testing fraternity it may mean "did not achieve the required test result".  To construction engineers it may mean 'clearly broken'.

If the test merely says that the computed pile capacity is less than specified, try a re-test, and thoroughly examine the design calculations to see whether the design engineer has been unreasonably conservative.

Have any other piles on your project been tested?  Is it possible that the actual PDA testing procedure has imposed an excessive load on your pile?  If your piles are bearing on hard rock, an over-enthusiastic PDA tester (intending to generate some movement at the pile toe) can quite easily break a perfectly sound pile.

Good luck.

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


White Paper - Implementing a Multi-Domain System
IoT systems are multi-domain designs that often require AMS, Digital, RF, photonics and MEMS elements within the system. Tanner EDA provides an integrated, top-down design flow for IoT design that supports all these design domains. Learn more about key solutions that the Tanner design flow offers for successful IoT system design and verification. 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