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On the basis of shear strength, soils can be divided into three types. Which of the following options is INCORRECT?
1. Cohesionless soils
2. Cohesive frictional soil
3. Purely cohesive soils
4. Elevated cohesion soil

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Correct Answer - Option 4 : Elevated cohesion soil

Concept:

On the basis of Shear strength, the soil is classified into three types as specified below:

1. Cohesion-less Soils: They are purely granular soils and possess no cohesion at all.  Examples are: Sand.

The shear strength of such soils is given as:

τ = σ tanϕ

Where

σ' is effective normal stress and ϕ is the angle of internal friction

2. Cohesive Soils: Soils such as clay possess cohesion but no friction at all. The shear strength of such soils is given as:

τ = c ; c is cohesion

3. Cohesive frictional Soils: Soils that possess both cohesion and friction are called c-ϕ soils. Example: silt. The shear strength of such soils is given as:

τ = c + σ tanϕ

Where

c is cohesion

σ' is effective normal stress and ϕ is angle of internal friction

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