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


Lateral pile load test - Deflection measurement

Lateral pile load test - Deflection measurement

Lateral pile load test - Deflection measurement


We are doing a Lateral pile load test on land pile of dia 1.4m for a marine stimulated condition by considering the dredge level 14.5 m by providing the outer casing dai 1.6m upto the above dredge level.

Design load is 10 T and Test load is 20T.

We are going to fix two dial gauges, one at the cut off level and other at 2.0m below cut off level. By consider the depth of fixity, the dredge level deflection will be interpolated by linear interpolation method with the help of two fixed dial gauges at different pile top level.

Please give the suggestion that without providing strain gauges or Inclinometer, Is it possible to measure the lateral deflection by linear interpolation method.

Also, Please suggestion the other method to measure the lateral deflection of the marine piles.

Vinothkumar S
Geotechnical Engineer

RE: Lateral pile load test - Deflection measurement

Does this actually simulate the marine pile accurately enough? I'd have thought the extra 14.5m of overburden on the land pile test will reduce the land pile deflection.

RE: Lateral pile load test - Deflection measurement

At least for a back up, set up a surveyor's transit some distance away to sight on a horizontal surveyor's rod periodically in the test. Sight on a fixed reference beyond also. I should add the deflection required for a "good" test may be far beyond the capabilities of dial gauges. I'd be prepared for maybe a half meter deflection as a possibility.

RE: Lateral pile load test - Deflection measurement

If I understand correctly, the test pile will be cantilevered above the 14.5 M depth. With a lateral load applied at the top, the moment will increase with depth, and the radius of curvature and slope will also increase with depth. The pile won't be linear, so you can't calculate the deflection at 14.5 meters by assuming it is linear. However, you should be able to calculate the shape of the cantilevered pile quite accurately if you know the properties of the section, because you will know the moment and shear at all depths down to 14.5 meters. You probably can use the equations for deflection of a cantilever beam from the Steel Design Manual or other reference. Knowing the calculated deflection and the slope at the dredge line, you should be able to calculate the deflection at the dredge line.

I share Steve49's concern that this may not be an accurate simulation of the behavior of the marine pile.

RE: Lateral pile load test - Deflection measurement

Hi everyone,

Thank you for your valuable feedback.

Vinothkumar S
Geotechnical Engineer

RE: Lateral pile load test - Deflection measurement

If i understood properly, irrespective of predicting deflection along the pile the pile measurement at pile head (deflection, slope, B.M.) can allow you to produce a pile soil response to predict the deflection and capacity. The reference could be done to
L. C. Reese and W. R. Cox, "Soil Behavior from Analysis of Tests of Uninstrumented Piles under Lateral Loading," in Performance of Deep Foundations, ed. R. Lundgren and E. D'Appolonia (West Conshohocken, PA: ASTM International, 1969), 160-176.
I had never adopted this in work but i read this for understanding. Hope this will give some help.

But have seen many case studies which use the method as told by Oldestguy.

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 - 10 Reasons to Choose CATIA on the Cloud
To compete in today’s fast-paced and competitive market, smaller and newer firms need a powerful platform that will enable them to compete with bigger players, without the heavy investments needed in computer hardware, software and personnel. Download Now
White Paper - Smart Manufacturing for Electronics
This white paper describes a transformative approach to electronics manufacturing made possible by the addition of Mentor Graphics to the Siemens family. It describes a completely digitalized strategy that supports both printed circuit board (PCB) and mechanical design and manufacturing, uniting the entire product lifecycle – from idea and production to customers and back. 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