If the effective stress strength parameters of a soil are

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If the effective stress strength parameters of a soil are c’ = 10kPa and Φ’ = 30°, the shear strength on a plane within the saturated soil mass at a point where the total normal stress is 300kPa and pore water pressure is 150 kPa will be

1. 90.5 kPa
2. 96.6 kPa
3. 101.5 kPa
4. 105.5 kPa

Correct Option: B

S = C' + σ' tan Φ
= C' + (σ – μ) tan Φ
= 10 + (300 – 150) tan 30°
= 96.6 kN/m²