1) What are the two sources to soil shear strength? 2) Why can't a Mohr circle ever cross the Mohr-Coulomb failure envelope? What happens once a  point on the circle touches the envelope? How does the point of tangency where the Mohr circle  touches the failure envelope relate to the orientation of the failure plane in the soil?  3) What are some advantages and disadvantages of the direct shear test? 4) What does it mean for a shear test to be a "drained" shear test? How do you think this would  differ from an "undrained" shear test?

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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1) What are the two sources to soil shear strength?
2) Why can't a Mohr circle ever cross the Mohr-Coulomb failure envelope? What happens once a 
point on the circle touches the envelope? How does the point of tangency where the Mohr circle 
touches the failure envelope relate to the orientation of the failure plane in the soil? 
3) What are some advantages and disadvantages of the direct shear test?
4) What does it mean for a shear test to be a "drained" shear test? How do you think this would 
differ from an "undrained" shear test? 

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