×
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

Fundamental Question
3

Fundamental Question

Fundamental Question

(OP)
Excuse my lack of knowledge on what is probably a very fundamental soil mechanics question.  But, I have looked through my soil mechanics books and searched online, and cannot find a definition of "effective angle of internal friction".  Can someone answer this, and what is the difference between this and the "angle of internal friction"?  Thanks in advance.  

RE: Fundamental Question

3

CJSchwartz;

The answer lies in total and effective.  Total stress incorporates the soil response whether partially saturated of fully saturated.  Hence, a friction angle from a test run quickly such that the soil cannot drain during shear yields a total stress.  Incorporating the effect of pore water response in the soil by either measuring the pore pressure response and subtracting it from the total stress measured, or by running the test sufficiently slow so that no porewater pressure develops (drained test), results in effective stress.

The friction angle measured from a total stress test is the angle of internal friction; the friction angle measured from a test corrected for pore pressure is the effective angle of internal friction.

Check again under total and effective stress and shear strength of soils.



RE: Fundamental Question

Quote:

definition of "effective angle of internal friction"

It's the failure envelope when pore pressure is excluded from the forces acting on the shear plane.

Hope this helps.

f-d

¡papá gordo ain’t 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