A cohesionless soil sample was subjected to a triaxial test.  The sample failed when the minor principle stress was 1200 lbs/ft2 and the deviator stress applied was 3000 lbs/ft2.  Find the internal angle of friction of this soil. (answer in degrees)

Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
Publisher:Braja M. Das, Khaled Sobhan
Chapter12: Shear Strength Of Soil
Section: Chapter Questions
Problem 12.16P
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A cohesionless soil sample was subjected to a triaxial test.  The sample failed when the minor principle stress was 1200 lbs/ft2 and the deviator stress applied was 3000 lbs/ft2.  Find the internal angle of friction of this soil. (answer in degrees)

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