For a triaxial shear test conducted on a sand specimen at

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For a triaxial shear test conducted on a sand specimen at a confining pressure of 100 kN/m² under drained condition,s resulted in a deviator stress (s₁ – s₃) at failutre of 100 kN/m². The angle of shearing resistance of the solid would be

1. 18.43°
2. 19.47°
3. 26.56°
4. 30°

Correct Option: B

σ₁' = σ₃' + σ_d'
= 100 + 100 = 200 kN/m²
C = 0
σ₁' = σ₃' tan² α + 2c tan α'

		α = 45 +	Φ
			2

⇒ 200 = 100 tan² α
∴ α = 54.73°
⇒ Φ = 19.47°