×
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

Limitation of CPT wrt soil type

Limitation of CPT wrt soil type

Limitation of CPT wrt soil type

(OP)
Hi,
Could anyone guide me on any published literature on the use of cpt in certain type of soils.

This question may be trivial to most of you; but any reference may be helpful.

Regards

RE: Limitation of CPT wrt soil type



As given in Donald P. Conduto’s book Geotechnical Engineering, Principles and Practices (1999, Prentice-Hall), Table 3.5, the cone penetration test is suitable for all soils other than gravels (and, by inference those materials larger than gravel sized).  The table, developed fromJames K Mitchell (1978) “In-Situ Techniques for Site Characterization,” Site Characterization and Exploration, pp. 107-129, C.H. Dowding, Ed., ASCE, gives the following suitable soils for in-situ testing:

Standard Penetration Test:  All except gravels
Cone Penetration Test:      All except gravels
Pressuremeter Test:         All
Dilatometer Test:           All except gravels
Becker Penetration Test:    Sands through boulders

As expected, most in-situ testing has troubles with coarse sizes (gravels and above).  The notable exception is testing done by the Becker Hammer (developed in Canada).

Hope that this helps.

RE: Limitation of CPT wrt soil type

(OP)
Thanks BigH!..you are an angel!
I will go though the references and update on this.  I was more interested in sand gravel mixes; performance of CPTs in sands with different gravel compositions.
I hope someone has come across such literature.

Regards

RE: Limitation of CPT wrt soil type

If there is, it won't be much.  Since sand/gravel mixtures have fairly high densities and bearing capacities, most (all?) conventional CPT rigs can't get a lot of penetration into these soils.  The last time I looked, Fugro's fully enclosed truck rigs max out at about 60 U.S. tons.  Hogentogler's may be higher, but not by a whole lot.  That seems like a lot of force, until you think about the total sleeve friction.  The load isn't all transferred to the CPT point -



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

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