This page was printed from

Zero cohesion

News | April 1, 2011 | By:

Editor’s Note: The question below was submitted regarding the Richard Thiel article “Cohesion (or adhesion) and friction angle in direct shear tests,” from the April 2009 Geosynthetics.


From: Leo
Posted: Oct. 3, 2010 | 11:12 p.m.

What happens if you force the line of best fit through zero, to force a zero cohesion?


From: Richard Thiel, President, Thiel Engineering

Forcing the best fit  envelope through the origin is usually a conservative and accepted interpretation of the test results.  If this interpretation results in an inadequate definition of shear strength to demonstrate slope stability, then a more rigorous interpretation of the results may be in order. In general, a more rigorous interpretation that does not require a forced envelope through the origin should be allowed when requested.

Join the discussion

To post your thoughts on these comments, fill out the comment form on the bottom of the article “Cohesion (or adhesion) and friction angle in direct shear tests,” or send your coments to editor Ron Bygness at

Comments and letters can contain opinions of individuals who are writing and do not necessarily reflect the views of Geosynthetics magazine or the Industrial Fabrics Association International.

Share this Story

Leave a Reply

Your email address will not be published. Required fields are marked *

Comments are moderated and will show up after being approved.