Statement (I): Cohesion and angle of internal friction are shear strength parameters of soils.
Statement (II): Cohesion is zero for pure sand and angle of internal friction is zero for pure clay.
According to the Mohr–Coulomb Failure Criterion, the shear strength of soil is expressed as:
Therefore, cohesion and angle of internal friction are the two fundamental shear strength
parameters of soil.
Under Idealized Conditions , Cohesion is zero for pure sand and angle of internal friction is
zero for pure clay.
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