# The shearing strength of the soil is due to: i. Cohesion ii. Structural resistance iii. Internal friction Which of these is/are NOT correct?

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The shearing strength of the soil is due to:

i. Cohesion

ii. Structural resistance

iii. Internal friction

Which of these is/are NOT correct?

1. Only i
2. Only ii
3. ii and iii
4. None of the above

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Correct Answer - Option 4 : None of the above

Explanation:

Shear strength of soil is the capacity of soil to resist shearing stresses.  It can be defined as the maximum value of shear stress that can be mobilized within a soil mass. If this value exceeded by the shear stress on any plane or a surface at a point, failure will occur in soil because of movement of a portion of the soil mass along that particular plane. The soil is then said to be fail in shear.  Therefore, shear strength generally represented the strength of soil.

As per Mohr- Coulomb criteria, Shear strength of soil is given as:

τ = C + σ tanϕ

Where,

C is the Cohesion

σ is normal stress

ϕ is the friction angle

From above, it can be concluded that

a. It increases with an increase in the normal stress.

b. It is proportional to the cohesion of the soil i.e. increases with increase in cohesion.

c. it increases with increases in friction angle.