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?

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?

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter13: Slope Stability

Section: Chapter Questions

Problem 13.1P

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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?

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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?