Even when the normal forces are reduced to zero, some part of shear strength is still left on the soil. This strength is due to:
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A.
true cohesion
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B.
interlocking friction
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C.
sliding friction
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D.
apparent cohesion
Correct Answer:
A. true cohesion
Explanation:
The correct answer is true cohesion.
Even when the effective normal stress on a soil sample is zero, certain types of soil, particularly clays, retain a degree of shear strength known as true cohesion. This internal strength is primarily derived from intermolecular forces and electrostatic attractions between soil particles rather than physical friction or interlocking. While factors like interlocking friction and sliding friction contribute to overall shear strength when pressure is applied, true cohesion exists independently of external loading. Therefore, it is the fundamental component that allows soil to maintain its structure without normal forces.
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