×
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

Pile near a deep excavation

Pile near a deep excavation

Pile near a deep excavation

(OP)
I have a building which has already been constructed supported on piles and a mat foundation. The bottom of the raft is -1.9.
A watertank has been added recently. It is composed of one basement, ground and a roof.
The bottom of its raft is -6.4.
I would like to know what is the minimum distance between the pile of the adjacent buildimg and the newly excavation to respect in order not to disturb the confined soil by the pile ?
Thank you.

RE: Pile near a deep excavation

Are the elevations given in feet or meters?
How long are the existing piles?
What material, wood, concrete, steel H-pile, etc?
What is the existing pile spacing, center-to-center?
What is the existing pile size (diameter)?
Are the existing piles point bearing or friction?
Will the new piles be the same material and size as the existing?
Bottom of the new raft is -6.4. Is that the bottom of the excavation, too? Or will there be backfill up to -6.4?

www.SlideRuleEra.net idea
www.VacuumTubeEra.net r2d2

RE: Pile near a deep excavation

(OP)
Elevations in meters
The piles are 15 m.deep
Concrete pile @ 2.5m spacing (80cm diamater)
Friction piles
There will be no new piles.
Watertank is founded on a mat foundation but i dont want to disturb the soil near the piles so i am asking abou the minimum distance between the pile and any excavation which will occur.
Is there any reference ?

RE: Pile near a deep excavation

I would say the minimum distance is equal to the pile spacing, 2.5 meters. What I mean by minimum is that, IMHO, a properly braced excavation should be no closer than 2.5 meters. This is regardless of how "good" the soil may be. Consult a geotech engineer, they may recommend a larger distance than 2.5 meters.

www.SlideRuleEra.net idea
www.VacuumTubeEra.net r2d2

RE: Pile near a deep excavation

This is a potential block failure, taking the whole system toward the excavation. There was one of these on the Internet over in
China and a building came down. It requires a detailed geotech study, no cook book determination.

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