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Physical Properties of Rock

# Physical Properties of Rock - Physical Properties of Rock...

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Physical Properties of Rock, Soil and Water Coulomb equation 1. dry soil o u is atmospheric o c = 0 o S = normal stress * tan phi 2. wet soil o c > 0, u <0 o effective normal stress = normal stress - (-u) = normal stress + u, that is water increases the normal stress (adds weight to the soil) o s = c + normal stress * tan phi 3. saturated soil o u > 0 o S = c + (normal stress - u) tan phi Note when c = 0 (# 2 above), tan phi = shear strength/ normal stress, when shear strength = shear stress, i.e. at the critical stability threshold (failure is imminent) therefore, tan phi = shear stress/ normal stress = W sin theta / W cos theta = tan theta or tan phi = tan theta, i.e. slope angle (theta) is governed by friction (phi) Factor of Safety shear strength/ shear stress = 1, critical threshold < 1, slope instability > 1, slope stability Atterberg limits behavoir of fine sediment: plastic limit water content at the transition from solid to plastic behavior, measured when a wet thread of fine soil begins to crumble liquid limit

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Physical Properties of Rock - Physical Properties of Rock...

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