×
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

SPT Test using a cone tip?

SPT Test using a cone tip?

SPT Test using a cone tip?

(OP)
Has anyone used this before?  Is there an ASTM standard?  What is the test called.

We used it at a site in South America.  The same hammer, count the blows to penetrate the ground 15cm like the SPT but there was a solid cone at the tip instead of a SPT barrel.

RE: SPT Test using a cone tip?

I don't think this is an ASTM Standard - but it was pretty "standard" when I worked in Canada - called the 'pentest' - the cone was 51mm 60 apex angle.  We usually counted the blows at 300mm not 15mm.  It was well described in the first Canadian Geotechnical Engineering Manual.

RE: SPT Test using a cone tip?

There were some good side by side studies done between the pentest and SPT showing a pretty good correlation depending on material type.  But I can't recall the name of the author/papers.  The studies did show that at depth (maybe greater than 40 feet?) rod friction in the pentest became a big factor and the correlation diverged.    

RE: SPT Test using a cone tip?

The dynamic cone penetrometer has been used for many years to characterize near surface soils.  For downhole testing, the static cone penetrometer is usually used.

The DCP that I have used and has been used my many departments of transportation in the US, is a manual device using a 15 lb hammer instead of the 140 lb SPT hammer.

RE: SPT Test using a cone tip?

The one I used was in Canada and similar to that described by BigH; mounted on a track drill rig with 140 lb hammer and 30" drop, same as SPT.  The advantage was continuous data and quick.

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