For a direct shear test on a soil having USCS classification SP, the shear stress at failure was 45.5 kPa for a normal stress of 65 kPa. What is the effective friction angle for this material? Sketch and label the Mohr's Circle and Mohr-Coulomb failure envelope.

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 12.17P
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For a direct shear test on a soil having USCS classification SP, the shear stress at failure was 45.5 kPa for a normal stress of 65 kPa. What is the effective friction angle for this material? Sketch and label the Mohr's Circle and Mohr-Coulomb failure envelope. 

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