×
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

Pocket Penetrometer/ Undrained Shear Strength
2

Pocket Penetrometer/ Undrained Shear Strength

Pocket Penetrometer/ Undrained Shear Strength

(OP)
Why is it that the value achieved using a pocket penetrometer is equivalent to twice the value of the undrained shear strength.
The confusion is that since the pocket penetrometer is penetrated into the soil sample pretty quickly, then shouldn't it be considered an undrained strength ?

RE: Pocket Penetrometer/ Undrained Shear Strength

2
It is a measure of the unconfined compression strength. The pressure you are creating to push the pocket penetrometer into the soil is sigma(1). There is no confining pressure, sigma(3)=0. Therefore, a plot of the mohr-coulumb failure envelope indicates the radius of the Mohr's circle is the undrained shear strength, which is qu/2.

RE: Pocket Penetrometer/ Undrained Shear Strength

JMCC3265 has the answer.

f-d

ípapß gordo ainÆt no madre flaca!

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