×
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

Soil Nail Wall Deformation

Soil Nail Wall Deformation

Soil Nail Wall Deformation

(OP)
See page 95 (PDF page 117) of the file at the following link.

http://isddc.dot.gov/OLPFiles/FHWA/010946.pdf


It relates to the design of soil nail walls, Figure 5.18 (b) essentially says that the nail "head" will move inward (ie into the soil) at ultimate load.  This is opposite to the direction of the applied force.  

This does not make sense to me.  At ultimate I would expect that the soil nail (which is in tension) elongate and move outward.

Can someone explain what is going here?

Thanks
 

RE: Soil Nail Wall Deformation

The nail head does not move (except due to some elongation of the nail tendon).  The shorcrete wall facing will try to push forward as the earth pressure builds up when additional excavation is performed in front of the wall.  Since the nail head remains relatively in the same location, it only appears that the nail head is moving inward.  You will not notice this happen unless your nails are too far apart and you greatly underdesign the shotcrete which then starts bulging between nails.

RE: Soil Nail Wall Deformation

I think the wall moves out and the soil nail stays where it is.

RE: Soil Nail Wall Deformation

(OP)
I agree 100%, but the from the Figure, there is an "initital position" line and it clearly shows the nail head moving away from it... in the direction opposite to the load none the less

RE: Soil Nail Wall Deformation

well, the figure is wrong.

RE: Soil Nail Wall Deformation

(OP)
Seems like a pretty big mistake, not to mention a similar thing is shown in Figure 5.20.

So I find it hard to believe that the figure is incorrect

RE: Soil Nail Wall Deformation

(OP)
Sorry, I mean... I find it hard to believe that the figure is correct  

RE: Soil Nail Wall Deformation

NS4U,

I think you are absolutely right.  The initial position should be moved to the right on Fig. 518 (b).  There is also a mistake on Fig. 518 (a).  The arrow pointing to the circle around the nail should be labeled "Fracture on internal face".

Looks like a slip in editing the document.

Best regards,

BA

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