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Coulomb–Terzaghi shear strength equation


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The equation that is used to calculate the total shear strength (s) of the material composing a slope, taking account of the pore-water pressure. The shear strength is then equal to the sum of the normal stress (σ) and cohesion (c). The Coulomb–Terzaghi equation is:s = c + σ.tan ϕwhere tan ϕ is the coefficient of plane sliding friction, which describes the packing, surface roughness, and hardness of the materials constituting the slope.

s = c + σ.tan ϕ

Subjects: Earth Sciences and Geography.


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