Page 1 Shear Strength of Soil Page 2 Shear Strength of Soil • Shear strength in soils – Introduction – Definitions • Mohr-Coulomb criterion – Introduction – Lab tests for getting the shear strength • Direct shear test – Introduction – Procedure & calculation – Critical void ratio Class Outlines Page 3 Shear Strength of Soil • Shear strength in soils – Introduction – Definitions • Mohr-Coulomb criterion – Introduction – Lab tests for getting the shear strength • Direct shear test – Introduction – Procedure & calculation – Critical void ratio Class Outlines Shear Strength • The strength of a material is the greatest stress it can sustain; • So that the unit of strength is the same as stress (Pa in SI unit system); Page 4 Shear Strength of Soil • Shear strength in soils – Introduction – Definitions • Mohr-Coulomb criterion – Introduction – Lab tests for getting the shear strength • Direct shear test – Introduction – Procedure & calculation – Critical void ratio Class Outlines Shear Strength • The strength of a material is the greatest stress it can sustain; • So that the unit of strength is the same as stress (Pa in SI unit system); Significance of Shear Strength • The safety of any geotechnical structure is dependent on the strength of the soil; • If the soil fails, the structure founded on it can collapse. • Understanding shear strength is the basis to analyze soil stability problems like: – lateral pressure on earth retaining structures (Chs. 12, 13), – slope stability (Ch. 14), and – bearing capacity (Ch. 15). Page 5 Shear Strength of Soil • Shear strength in soils – Introduction – Definitions • Mohr-Coulomb criterion – Introduction – Lab tests for getting the shear strength • Direct shear test – Introduction – Procedure & calculation – Critical void ratio Class Outlines Shear Strength • The strength of a material is the greatest stress it can sustain; • So that the unit of strength is the same as stress (Pa in SI unit system); Significance of Shear Strength • The safety of any geotechnical structure is dependent on the strength of the soil; • If the soil fails, the structure founded on it can collapse. • Understanding shear strength is the basis to analyze soil stability problems like: – lateral pressure on earth retaining structures (Chs. 12, 13), – slope stability (Ch. 14), and – bearing capacity (Ch. 15). Shear Failure in SoilsRead More

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