×
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.

Students Click Here

How deep will my spud legs sink?

How deep will my spud legs sink?

How deep will my spud legs sink?

(OP)
I have been asked to approximate how deep the spud legs of a barge are likely to sink when moored in various offshore locations. I only have a few borehole records in nearby areas that give vague soil descriptions and SPT blow counts. What would be the best way to tackle this problem? I only need an approximate solution.

RE: How deep will my spud legs sink?

You are dealing with a treacherous problem.  As I understand things, most of the failures of offshore structures are due to plunging failures of jack-ups.

It's a bearing capacity problem; you need to use the strength data to estimate the ultimate bearing capacity.  When the ultimate bearing capacity is 1.5 to 2 times the estimated footing pressure, you have a reasonable estimate.  The depth to this pressure is the approximate leg penetration.



Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

RE: How deep will my spud legs sink?

Hello Fak:

It depends on how the barge is to be utilized. We used spud barges to drill wide river crossings and the approach did not require any calculations of bearing capacity using SPT etc. For jackup barges for oil well drilling this may be a different issue as pointed out by Focht3. In such a case you may need to do some profiling of the river bed to obtain a suitable answer. The sensitivity of the structure is important as well.  

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


Resources

Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
The Great Project Profitability Debate
A/E firms have a great opportunity to lead the world into the future, but the industry’s greatest asset—real-time data—is sitting wasted in clunky, archaic ERP platforms. Learn how real-time, fully interactive dashboards in a modern ERP allow you to unlock data that will shape the future of the world. 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