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AGEN 304 Lecture 8 - Shear Stress and Failure Theories

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  AGEN 304 Lecture   8   : Review of previous lecture 7: Effectives stress: ã no flow, downward and upward conditionsShear strength:  – Definition  – Components  – Coloumb’s law  – Mohr theory  – Mohr-Coulomb theory  – Mohr-coulomb failure criterion & Mohr circle  Lecture 8: Shear strength and failure theories ã Narrative summary of the Mohr-Coulomb theory ã Relationship between angle of failure of soil plane and angle of internal friction ã Methods of measuring shear strength ã Relationship between major and minor principal stresses ã Application of Mohr-Coulomb Failure theory i.e.  – Rankineequation for active pressure on retaining structures  Failure theories How can we make the earth material with the Mohr circle above fail?  Failure theories: Mohr   -   Coulomb criterion ã When the circle touches the Mohr-Coulomb failure criterion/envelope (the straight line) shear failure occurs. ã There are three ways for the circle reach the straight line to reach failure: ã 1)Increase σ1 ; ã 2)Decrease σ3;ã3)Decrease both σ1 and σ3 by the same amount (equivalent to increase the pore pressure discussed before)

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Oct 7, 2019
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