Why in the case of normally consolidated clay c' is zero?
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Explanation:
Clay cannot have zero cohesion, unless you are referring to the long term soil behavior. The long term soil behavior is how a soil behaves after the moisture has had enough time to drain out (which ca take up to 40 years depending on the soil). Once the water has draines out the shear strength comes from the friction between the soil particles.
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Explanation:
. Some believe that cohesion or apparent cohesion behavior is due to inter particle forces in fine grained soils that are related to soil structure, pore-water pressures (and the manner they are generated and dissipated), and chemical composition of these soils.
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