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

Stockpile level control

Stockpile level control

(OP)
I am designing a retaining wall around a stockpile fed from an overhead conveyor. The client says they will install a sensor to limit the height of the stockpile and hence the height (and cost) of the retaining wall. How reliable is this? I would prefer to design for a stockpile up to the underside of the conveyor to allow for control system failure/lack of maintenance/de-activation.

What is my liability if the control system does not work and the stockpile overfills and caused structural problems?

RE: Stockpile level control


Quote:

What is my liability if the control system does not work and the stockpile overfills and caused structural problems?

That depends on the extent of the structural problems. If it is greater than expected deflection, or wider than specified cracks, then it would be pretty hard to blame the designer (assuming you have a clear statement of the lower design stockpile height from the client). If it is collapse then you could have a problem even if you followed the clients specification exactly.

I'd suggest designing for the lower stockpile height following the normal code requirements, then check what happens if you use the maximum possible fill height as an ultimate load case, with a lower load factor on the stockpile weight and accepting some movement or overstress (above SLS levels) in the wall.

A similar approach to earthquake design.

Not sure why this is specifically an AS/NZS code issue by the way?

Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/

RE: Stockpile level control

(OP)
Thanks, Doug. That's along my line of thought.
No it's not specifically AS/NZS but the project is in Oz & I couldn't find a better place for it.

RE: Stockpile level control

These type retention walls are typically designed for loading to the top, with the retained material sloping up and away. If the wall is overtopped, the material should spill over. So that's your control system. Am I misunderstanding?

RE: Stockpile level control

(OP)
hokie66, in this case the material above the wall will be retained by cladding attached to a separate structure.

RE: Stockpile level control

Agree with the suggestion from Hokie 66, That's the best thing the designer can do.

RE: Stockpile level control

It is difficult to say without understanding the situation in detail, though if the design is not suitable for the foreseeable reasonable abnormal condition you would probably have a problem.
Hence the over height detection (device (s), control system etc) needs to have suitable integrity (alternative detection methods, redundancy, SIL / category rating AS4024 etc) to maintain the design assumptions.

Regards,
Lyle

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